The solar energy industry continues to evolve with innovative technologies that improve efficiency, reliability, and long-term cost savings. Among the top advancements are Topcon solar cells and bifacial solar panels, two key technologies that are revolutionizing the way solar power is harnessed and utilized. In this blog, we will dive into a detailed comparison of Topcon vs bifacial solar panels, breaking down their benefits, applications, and how they are shaping the future of solar energy.

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Table of Contents

Introduction to Topcon Solar Cells

Topcon (Tunnel Oxide Passivated Contact) solar cells represent a significant leap in solar photovoltaic (PV) technology. Topcon is essentially a new generation of monocrystalline silicon solar cells designed to reduce efficiency losses and improve energy output. This is achieved through a passivation layer that reduces recombination losses, one of the main factors causing energy loss in traditional cells.

One variety of n-type solar cells is the TOPCon cell. A semiconductor material that has been doped with phosphorus to give it a negative charge is used to create n-type cells. Higher efficiency and improved performance in low light levels are only two of this type of cell’s many advantages over p-type cells.

Introduction to Bifacial Solar Panels

Standard solar panels consist of three layers: a top layer of transparent glass that protects the panel and allows sunlight to pass through, a middle layer of silicon that converts solar energy into electricity, and a bottom aluminum frame for support. Bifacial panels differ by replacing the aluminum frame with an additional layer of glass, enabling them to capture reflected light from the ground. You can visualize bifacial panels like an ice cream sandwich, with glass layers on the outside and silicon in the center. They are typically installed to face the sun on one side while the other side collects reflected light.

Topcon vs Bifacial

Efficiency and Performance

When it comes to efficiency and performance, Topcon vs Bifacial solar panels both offer significant advantages over traditional solar technologies, but they excel in different ways.

1. Energy Conversion Efficiency

• Topcon Solar Cells: These cells are known for achieving efficiency rates of over 28%, making them one of the most efficient solar cells currently available. The improved passivation layer reduces recombination, allowing more energy to be harvested from the same amount of sunlight.

• Bifacial Solar Cells: Bifacial panels also have high efficiency rates, with the added benefit of generating up to 30% more energy compared to monofacial panels in ideal conditions. The ability to capture sunlight from both sides makes bifacial technology a great option for maximizing energy output.

2. Performance in Various Conditions

• Topcon Solar Cells: In the Topcon vs Bifacial performance discussion, Topcon cells maintain high efficiency in various environmental conditions, including low light and high temperatures. Their advanced design minimizes energy losses that commonly occur in traditional PERC cells, making them particularly useful in regions with fluctuating weather.

• Bifacial Solar Cells: The performance of bifacial panels heavily depends on the reflective surface underneath. In installations with high ground reflectivity (such as snowy regions or white-painted rooftops), bifacial panels can outperform monofacial panels by a considerable margin. However, their efficiency gain diminishes in low-reflective areas.

Technology Overview

• Topcon Solar Cells: TOPCon technology improves solar cell efficiency, reaching up to 28% conversion rates, surpassing traditional solar cells. It reduces electron recombination at the surface using passivated contacts, enhancing overall efficiency. Silicon dioxide is often used as an insulating material to minimize energy losses, and TOPCon cells feature rear-side contacts to boost light absorption and energy yield, classifying them as N-type cells. The key difference between MonoPERC and TOPCon cells is that MonoPERC cells have passivated contacts on the front, while Topcon cells have them on the rear, typically resulting in higher efficiencies for Topcon.

• Bifacial solar Cells: Bifacial solar panels generate electricity from both sides, capturing sunlight on the front and back. This is made possible by a transparent backing that allows light to reach the rear solar cells. These panels are more efficient and produce higher energy output, especially in areas with high reflected light like snow or near water. Bifacial technology is gaining popularity and can be used in residential, commercial, and industrial applications.

Durability and Longevity

Both Topcon vs Bifacial solar technologies are designed for long-term durability, but there are some key differences in their longevity and performance over time.

1. Topcon Solar Cells: The efficiency of N-type cell PV Modules can go more than 25% unlike PERC Cell has a maximum theoretical efficiency of around 24%. Compared to PERC PV panels TOPCon panels have lower degradation during the 1st year and the 30 years of panel use.

2. Bifacial Solar Cells: The lifespan of bifacial solar panels is higher than that of traditional solar panels with a lifespan of 27 years and it can extend up to 30 years. However, the actual lifespan may vary depending on factors such as weather conditions, maintenance, and usage.

Cost and Availability

The initial cost and availability of solar technologies are always important considerations for businesses and homeowners. Here’s how Topcon solar cells and bifacial solar panels compare in terms of pricing and market availability.

1. Topcon Solar Cells

• Cost: Being a newer and more advanced technology, Topcon solar cells tend to be more expensive than traditional PERC cells. However, the improved efficiency and longevity may lead to better long-term savings on energy bills, making the initial investment worthwhile.
• Availability: Topcon technology is still emerging, and while it is becoming more widespread, it may not yet be as readily available as PERC or other standard solar cell technologies.

2. Bifacial Solar Cells

• Cost: Bifacial panels are generally more expensive than monofacial panels due to their dual-glass structure and the additional manufacturing process involved. However, their ability to generate more energy can offset the higher upfront cost in many cases.
• Availability: Bifacial technology is already widely available in the market, with many leading manufacturers offering bifacial models for commercial, industrial, and residential applications.

Applications

The choice between Topcon and bifacial solar technologies often depends on the specific application and location of the solar installation.

1. Topcon Solar Cells

• Best Applications: Topcon cells are ideal for use in residential, commercial, and utility-scale projects where high energy efficiency is required. Their superior performance in low-light and high-temperature conditions makes them suitable for regions with varied climates.
• Target Markets: Topcon technology is becoming popular in countries with aggressive renewable energy targets, including China, Europe, and the US.

2. Bifacial Solar Cells

• Best Applications: Bifacial panels are particularly effective in installations where the reflective surface beneath the panels can enhance energy production. These panels are commonly used in ground-mounted solar farms, floating solar arrays, and large commercial rooftop installations.
• Target Markets: Bifacial technology is gaining traction in regions with high solar radiation and reflective surfaces, such as desert areas, snowy regions, and industrial zones with reflective surfaces.

Performance in Different Conditions

1. Topcon Solar Panels

Topcon cells perform exceptionally well in a variety of environmental conditions. They maintain high efficiency even in low-light conditions or at high temperatures, making them versatile for installations across diverse climates. Their enhanced passivation layer reduces energy losses, making them a great choice for regions with variable sunlight or heat exposure.

• Performance Strength: Consistent efficiency in low-light and high-temperature environments.

2. Bifacial Solar Cells

Bifacial panels excel in areas where there is significant reflective light, such as snowy regions, deserts, or locations with reflective ground surfaces. However, they are less efficient in shaded areas or low-reflectivity environments, such as those with grassy terrain. The overall energy gain from bifacial panels depends heavily on the surrounding environment and the installation’s layout.

• Performance Strength: High performance in areas with reflective surfaces, but limited gains in shaded or low-reflectivity regions.

Installation Considerations

The installation process for both Topcon vs Bifacial solar panels differs slightly, primarily due to their design characteristics and structural requirements.

1. Topcon Solar Cells

• Installation: Topcon solar cells are generally installed like standard monofacial solar panels. They do not require special mounting systems, making them easier to integrate into existing solar arrays. Their slightly higher efficiency makes them a good fit for areas with space constraints.
• Mounting Systems: Standard mounting systems can be used for Topcon installations, and the process is similar to that of PERC or monocrystalline panels.

2. Bifacial Solar Cells

• Installation: Installing bifacial panels requires careful consideration of the reflective surfaces below. For maximum efficiency, bifacial panels should be mounted on raised structures or surfaces that enhance sunlight reflection, such as white roofs, gravel, or snow.
• Mounting Systems: Special mounting systems may be needed for bifacial panels to ensure they capture the maximum amount of light from both sides. Adjustable or tilted mounting systems can help optimize performance by allowing sunlight to reach the rear side of the panels.

Cost and Return on Investment (ROI)

1. Topcon Solar Cells

Topcon technology is relatively new, and as such, the initial cost of these panels is higher than traditional PERC or monocrystalline solar panels. However, their high efficiency and long-term reliability can offer a quicker ROI in areas with limited space or difficult environmental conditions, where every bit of efficiency counts. Higher upfront investment with faster ROI due to higher energy efficiency.

2. Bifacial Solar Cells

Bifacial panels also tend to be more expensive than standard monofacial panels due to their advanced construction and dual-glass design. However, their ability to produce up to 30% more energy, especially in reflective environments, can significantly reduce payback time, making them a cost-effective option for large-scale projects. Higher initial cost, but faster ROI when installed in ideal conditions with reflective surfaces.

Are you interested in learning more about Topcon mono solar panel? Contact us today to secure an expert consultation!

Environmental Impact of Topcon vs Bifacial Solar Panels

Both Topcon vs Bifacial solar technologies have a positive environmental impact by promoting renewable energy adoption. However, the way they influence sustainability differs slightly.

1. Topcon Solar Cells

• Environmental Benefits: Topcon technology’s high energy efficiency means more electricity is generated from the same amount of sunlight, reducing the overall need for additional solar panels and associated raw materials. This can lower the environmental footprint of solar installations.

2. Bifacial Solar Cells

• Environmental Benefits: Bifacial panels offer the advantage of generating more energy from the same area, reducing land use and maximizing solar potential. Their dual-glass structure also reduces the need for materials like plastic back sheets, which can have a more positive environmental effect.

Conclusion: Which Is Better – Topcon vs Bifacial?

Topcon vs Bifacial solar panels depends largely on the specific needs and conditions of the solar project.

• Topcon solar cells offer top-tier efficiency and durability, making them an excellent choice for regions with variable weather conditions or limited installation space.
• Bifacial solar Cells, on the other hand, are a great solution for large-scale projects where ground reflectivity can be maximized, providing a substantial boost in energy output without requiring additional land or panel area.

For projects that require high efficiency in limited space or extreme environmental conditions, Topcon technology may be the better choice. For installations where reflection can be leveraged, such as on snow, sand, or water, bifacial panels might be the superior option.

In the end, both technologies represent significant advancements in solar energy, each offering unique benefits that cater to different types of solar projects. Solar installers, developers, and energy consumers should carefully evaluate their specific conditions and energy needs to determine which technology will provide the best long-term value.

Evolution of The Solar Industry With Mono PERC, HJT & TOPCon Technology

9 min read
by EZ SEO

Solar panel manufacturing technology has come a long way over the years, and there have been significant advancements recently with the introduction of mono PERC, Topcon and HJT technology. These new technologies have led to improvements in solar panel efficiency, durability, and overall performance, thus, making them a more viable and cost-effective option for renewable energy production. Let us discuss each solar PV module technology and understand the differences.

PERC Solar PV Modules

In recent years, Passivated Emitter and Rear Contact (PERC) solar panels have been gaining popularity in the solar panel industry as a viable option for creating more efficient solar power. These solar panels use PERC solar cells, an improved version of conventional solar cells. Their modified design allows them to generate 6 to 12 per cent more energy than their traditional counterparts.

About PERC Technology

PERC stands for Passivated Emitter and Rear Cell. The PERC solar cell has a presence of a passivation layer at the back side of the cell, which helps to minimize recombination losses and increase light absorption. The key role of the rear-side passivation layer is to reflect light that passes through the silicon cell without being absorbed back into the silicon. By reflecting this light, the passivation layer gives the solar cell a second chance at absorbing it, resulting in significant improvement in efficiency.

Advantages of PERC Solar Panels

PERC panels offer several benefits over traditional solar panels, which make them a popular choice for solar installers and customers. Here are the key advantages:

• Increased Energy Production: PERC solar panels have higher efficiency compared to traditional panels, resulting in increased power generation. It can add up to a 5% increase in energy production for a full PV system.
• Increased Low-light and High-heat Performance: PERC panels perform exceptionally well in low-light and high-heat environments, providing an increased efficiency of around 3%.
• High Area Efficiency: Because PERC panels are more efficient, they can achieve the same power output as traditional panels with fewer panels. This means a solar power system using PERC panels will need a lesser amount of space for installation.
• Reduced BOS Costs: With PERC panels, fewer panels can achieve the same output, resulting in reduced balance of system (BOS) costs, labour costs, and other soft costs such as inverters and disconnects.

Disadvantages of PERC solar panels

1. PERC solar panels are generally more expensive than traditional solar panels.
2. PERC solar panels are slightly more sensitive to shading than traditional solar panels.
3. PERC solar panels are a relatively new technology, there may be some uncertainty about their long-term durability and performance.

Applications of PERC solar panels

1. Residential rooftops:Mono PERC solar panels are a popular choice for residential rooftops due to their high efficiency, which allows homeowners to generate more electricity from a smaller roof space.
2. Commercial buildings: Mono PERC solar panels can also be used on commercial buildings, such as office buildings, shopping malls, and warehouses, to offset electricity costs and reduce carbon emissions.
3. Large-scale solar power plants: Mono PERC solar panels can be used in large-scale solar power plants to generate electricity on a utility scale.

TOPCon Solar Panels

TOPCon solar technology is a relatively new type of solar cell technology. TOPCon stands for “Tunnel Oxide Passivated Contact”. 

About TOPCon Technology

The TOPCon solar cell structure consists of a thin tunnel oxide layer sandwiched between a transparent conductive oxide (TCO) layer and a p-doped crystalline silicon layer. The TCO layer acts as a front contact for the solar cell, while the p-doped layer acts as the absorber layer. The tunnel oxide layer acts as a passivation layer, preventing the recombination of charge carriers at the surface of the solar cell. Increased efficiency enables the solar panel to capture a greater amount of energy per unit area.

Advantages of TOPCon Solar Panels

The adoption of TOPCon solar technology has gained popularity due to several benefits associated with it. Here are some of the key advantages of using TOPCon solar cell technology:

1. Manufacturing process: TOPCon solar cells can be manufactured with the same machines as P-type solar cells, i.e. manufacturers don't need to make any high capital investment to adopt this technology, making it easier and more cost-effective to produce TOPCon solar panels on a large scale.
2. Higher efficiency: TOPCon cells are more efficient in converting sunlight into electricity than P-type cells. The maximum efficiency of TOPCon cells is around 28%, which is higher than the maximum efficiency of about 24% for PERC cells. This higher efficiency results in more electricity generation from a given surface area.
3. Lower degradation: TOPCon modules have a lower power degradation during the first year and over the 25 years of use, compared to PERC solar PV modules. Hence, they will maintain their efficiency for a longer time, resulting in a longer lifespan of the solar panels.
4. Lower temperature coefficient: The temperature coefficient of TOPCon solar panels is lower than that of PERC solar panels. It means that TOPCon solar panels can maintain their efficiency at higher temperatures, which is particularly important in hot climates.
5. Bifaciality rate: TOPCon cells have higher bifaciality than PERC cells. It means that TOPCon solar panels can generate electricity from both the front and the back of the solar panel.
6. Low light performance: TOPCon solar modules have higher efficiency in low-light conditions than PERC modules. It means that TOPCon solar panels can generate more electricity even when there is not enough sunlight. 

Disadvantages of TOPCon Solar PV Module Technology

Here are some potential challenges before TOPCon solar cell technology

1. Cost: TOPCon solar cells can be more expensive to produce than traditional solar cells due to the additional materials and manufacturing steps required to create the thin-film layers needed for the cell.
2. Complexity: The manufacturing process for TOPCon cells is more complex than for traditional cells, which can make it more difficult to scale up production to meet high demand.
3. High-temperature processing: The production of TOPCon cells requires high-temperature processing steps, which can lead to increased energy consumption and carbon emissions, as well as the risk of defects or damage to the cell.
4. Sensitivity to impurities: TOPCon cells are more sensitive to impurities in the materials used to create them, which can lead to reduced efficiency or even complete failure of the cell.

Comparison Between PERC and TOPCon Solar Technology

When compared to a PERC solar cell, a TOPCon solar cell appears visually identical once installed in a module. However, Unlike PERC cells, TOPCon cells are made from n-doped silicon, which is more challenging to manufacture. However, this material allows TOPCon cells to achieve higher degrees of efficiency.

Another significant difference is the more laborious passivation process used for TOPCon cells. Despite being more technically challenging, this process achieves a greater effect. Specifically, applying a layer of polycrystalline silicon to the rear side of the cell requires significant technical effort but allows the solar cell to handle higher voltages, resulting in an increase in overall efficiency.

Applications of TOPCon Solar Panels

1. Utility-scale : TOPCon solar panels are often used in utility-scale solar power plants due to their high efficiency, which allows for more electricity to be generated from a smaller area.
2. Agriculture and farming: TOPCon solar panels can be used for agricultural applications such as water pumping, irrigation, and crop drying, providing off-grid electricity to remote areas.
3. Electric vehicle charging stations:TOPCon solar panels can be used to power electric vehicle charging stations, allowing for clean and sustainable transportation.

HJT Solar PV Module 

Heterojunction (HJT) solar cell technology is a relatively new type of solar cell that has been gaining popularity in recent years. The design and structure of HJT allow for a more efficient conversion of sunlight into electricity.

About HJT Solar Panel Technology

Heterojunction solar panels are a type of photovoltaic panel that consists of three layers of photovoltaic material. These panels incorporate two distinct technologies: crystalline silicon and amorphous "thin-film" silicon, which work in harmony to produce electricity.

HJT cells consist of three main materials: Crystalline Silicon (c-Si), Amorphous Silicon (a-Si) and Indium Tin Oxide (ITO)

The first layer, made of amorphous silicon, captures sunlight before it reaches the crystalline layer, as well as any light that reflects off the underlying layers. The middle layer is composed of monocrystalline silicon, which is primarily responsible for converting most of the sunlight into electricity. The final layer is another amorphous thin-film silicon layer, located behind the crystalline silicon, which captures any remaining photons that have passed through the first two layers.

By combining these two technologies, heterojunction solar panels can generate more energy than either technology could produce independently. These panels can achieve efficiencies of 25% or higher, making them an attractive choice for solar energy generation.

Advantages of HJT Solar Panels

Here are the major benefits of Heterojunction (HJT) solar panels summarized into short points:

1. High Efficiency: HJT solar panels have a conversion efficiency of 26.07% for monofacial modules and over 30% for bifacial, making it one of the most efficient solar technologies in the industry.
2. Good Temperature Coefficient: HJT cells are less affected by changes in temperature, making them great for use in high-temperature locations.
3. High Bifaciality: HJT cells have a high bi-faciality factor of 92%, making them a great choice for utility-scale applications that can take advantage of the albedo resource.
4. Easy Manufacturing Process: The HJT solar PV module manufacturing process only involves 5-7 steps, and the cost of equipment is constantly being reduced, making it a cost-effective and promising technology for the future of solar energy.

Disadvantages of HJT Solar Panels

Heterojunction (HJT) solar panels offer several advantages, but they also have some drawbacks. Here are the main disadvantages of HJT solar panels:

1. High Cost: HJT panels are more expensive due to the additional steps in manufacturing and costly materials.
2. Fragility: HJT panels are thin and have a complex structure, making them more vulnerable to damage.
3. Sensitivity to Humidity: HJT panels are sensitive to moisture, which can reduce their efficiency or damage the panel.
4. Complexity of Production: The manufacturing process for HJT panels requires specialized knowledge and equipment.
5. Low Manufacturing Scale: HJT panels are produced at a lower scale than traditional panels, which can make them more expensive and harder to find.
6. New Technology: HJT panels are a relatively new technology, and experience with installation and maintenance may be limited.

Comparison Between HJT and TOPCon Solar PV Module Technology

TOPCon and HJT solar panels are two advanced solar technologies that offer high efficiency and reliability. Here are some general features where two solar panels can differ:

1. HJT panels have higher efficiency and bi-faciality, but are more complex and expensive to manufacture, and are sensitive to humidity.
2. TOPCon panels have a simpler manufacturing process, lower cost, and are less sensitive to humidity, but have lower efficiency and bi-faciality compared to HJT panels.

Applications of HJT Solar Panels

1. Building-integrated photovoltaics (BIPV): HJT solar panels can be integrated into building facades, roofs, and windows to generate electricity while also providing architectural design and energy-saving benefits.
2. Space-constrained applications: HJT solar panels are a good choice for space-constrained applications such as portable solar chargers, off-grid cabins, and small boats, due to their high efficiency and compact size.
3. Utility-scale solar power plants: HJT solar panels can be used in large utility-scale solar power plants, especially for projects with higher solar irradiance, which increases the efficiency of the HJT panels.

Conclusion 

In summary, HJT panels offer the highest efficiency and bi-faciality, but are the most complex and expensive to manufacture and are sensitive to humidity. TOPCon solar panels have a simpler manufacturing process and are less sensitive to humidity, but have lower efficiency and bifaciality compared to HJT panels. Mono PERC panels have a simpler manufacturing process than both HJT and TOPCon panels but have lower efficiency and bifaciality compared to HJT panels.

In India, PERC (Passivated Emitter and Rear Cell) technology is widely used and is considered a good choice for most applications. Moreover, Mono PERC solar panels are known for their reliability, durability, and longevity. Topcon panels are relatively expensive and may not be cost-effective for all applications. Both TOPCon & HJT solar panels are also relatively expensive and  Both TOPCon & HJT may not be widely available in India.

We can conclude Mono PERC panels are a good choice for most solar applications in India, but the suitability of a particular technology ultimately depends on a variety of factors. It is best to consult with a reputable solar energy company to determine the most appropriate technology for your specific needs and budget.

For more information, please visit mono perc panels.

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