# How This Bifacial Solar Panel Reaches 91% Efficiency

Source: https://www.youtube.com/watch?v=tQoV4Qj0NQs
Recap page: https://rapidrecap.app/video/tQoV4Qj0NQs
Generated: 2025-09-09T12:32:28.877+00:00

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## Quick Overview

Tongwei has achieved a record 91.7% bifaciality factor for its 722 W TOPCon solar module, surpassing previous benchmarks and demonstrating the potential of advanced solar cell technology to significantly increase power generation.

**Key Points:**
- Tongwei achieved a 91.7% bifaciality factor, a significant technological advancement in solar panel efficiency.
- This record bifaciality was confirmed by TÜV Rheinland and achieved through a unique "sunken pyramid" structure.
- The design reportedly enhances selective texture on the non-electrode area and utilizes zebra-crossing passivation contact structures for optimal performance.
- The breakthrough is particularly significant as it utilizes TOPCon (Tunnel Oxide Passivated Contact) solar cell technology, known for stability and high efficiency.
- This advancement allows solar panels to capture more light from both the front and back, especially in environments with high albedo (reflectivity) like snow or light-colored surfaces.
- Bifacial panels, while more expensive and complex to install, offer a significant power gain of 10%-20% over monofacial panels in ideal conditions and up to 30% in snowy environments.
- Tongwei's success with TOPCon bifacial panels, achieving near premium performance at a lower cost than HJT alternatives, positions them as a leader in next-generation solar technology.

![Screenshot at 00:17: Screenshot of the PV Magazine article headline 'Tongwei achieves 91.7% bifaciality factor for 722 W TOPCon solar module', visually introducing the core achievement discussed in the video.](https://ss.rapidrecap.app/screens/tQoV4Qj0NQs/00-00-17.png)

**Context:** The solar energy industry is constantly pushing the boundaries of efficiency and cost-effectiveness. Bifacial solar panels, which can capture sunlight from both sides, have emerged as a key area of innovation. This video focuses on a significant breakthrough by Tongwei, a major solar manufacturer, in achieving record-breaking bifaciality with their TOPCon solar modules. The context involves the ongoing competition to develop more efficient and affordable solar technologies.

## Detailed Analysis

Tongwei has achieved a remarkable 91.7% bifaciality factor for its 722 W TOPCon solar module, a significant leap in solar panel technology. This achievement, confirmed by TÜV Rheinland, was realized through a novel "sunken pyramid" structure which optimizes light capture on both the front and back surfaces of the panel. The design incorporates selective texturing on the non-electrode area and specific passivation contact layers to enhance efficiency. Traditional bifacial panels offer a 10%-20% power gain over monofacial ones, with potential for up to 30% in environments with high albedo, such as snow. While bifacial panels are generally more expensive and complex to install, Tongwei's TOPCon technology offers high performance and stability at a cost that is significantly lower than alternatives like HJT cells. The front-facing side of Tongwei's panels achieves 25.67% efficiency, with the back side reaching an impressive 24.21%, significantly outperforming standard panels. This advancement in bifaciality and efficiency, achieved through advanced manufacturing techniques, positions Tongwei to capture a larger market share in the growing solar industry.

### Key Achievement

- Tongwei achieves 91.7% bifaciality factor for 722 W TOPCon solar module
- Confirmed by TÜV Rheinland
- Utilizes 'sunken pyramid' structure and advanced passivation contacts

### Bifacial Technology Explained

- Panels capture light from both sides
- Offers 10%-20% more power than monofacial panels
- Gains up to 30% in high albedo environments (snow, light surfaces)

### TOPCon vs. HJT

- TOPCon offers high efficiency and stability at lower cost
- HJT cells are more expensive
- Tongwei's TOPCon panels provide near-premium performance at a competitive price

### Performance Metrics

- Front efficiency 25.67%
- Back efficiency 24.21%
- Outperforms standard panels and industry averages

### Manufacturing Innovation

- 'Sunken pyramid' structure and 'zebra crossing' passivation contacts enhance light capture and electron flow
- Advanced manufacturing processes are key to scaling production

### Cost-Benefit Analysis

- Bifacial panels have higher upfront costs (10%-20%) and installation complexity
- Increased power output and potential for higher ROI, especially in specific environments
- Technology is maturing, costs are decreasing

### Market Impact

- Tongwei's breakthrough positions them competitively in the growing solar market
- Advances in bifacial technology are expected to drive wider adoption

![Screenshot at 00:17: PV Magazine article headline announcing Tongwei's record-breaking bifaciality achievement.](https://ss.rapidrecap.app/screens/tQoV4Qj0NQs/00-00-17.png)
![Screenshot at 00:23: Close-up of the automated manufacturing process for solar cells, highlighting the precision involved.](https://ss.rapidrecap.app/screens/tQoV4Qj0NQs/00-00-23.png)
![Screenshot at 00:40: Display of Tongwei's new and improved bifacial solar panels against a dark background.](https://ss.rapidrecap.app/screens/tQoV4Qj0NQs/00-00-40.png)
![Screenshot at 01:16: Graphic explaining the 'How It Works' concept of bifacial solar panels, showing light hitting both sides.](https://ss.rapidrecap.app/screens/tQoV4Qj0NQs/00-01-16.png)
![Screenshot at 01:32: Detailed cross-section animation of a bifacial solar cell, illustrating its layered structure.](https://ss.rapidrecap.app/screens/tQoV4Qj0NQs/00-01-32.png)
![Screenshot at 01:40: Microscopic view animation showing photons interacting with silicon atoms in a solar cell, releasing electrons.](https://ss.rapidrecap.app/screens/tQoV4Qj0NQs/00-01-40.png)
![Screenshot at 02:13: Diagram illustrating direct, scattered, and reflected irradiance on solar panels, explaining bifacial gain.](https://ss.rapidrecap.app/screens/tQoV4Qj0NQs/00-02-13.png)
![Screenshot at 02:30: Close-up of snow-covered ground, illustrating a high albedo surface that enhances bifacial solar panel performance.](https://ss.rapidrecap.app/screens/tQoV4Qj0NQs/00-02-30.png)
![Screenshot at 02:33: Aerial view of a suburban neighborhood with numerous houses featuring solar panels on their roofs.](https://ss.rapidrecap.app/screens/tQoV4Qj0NQs/00-02-33.png)
![Screenshot at 02:44: Wide shot of solar panels under a cloudy sky, demonstrating diffuse irradiance capture for bifacial panels in various weather conditions.](https://ss.rapidrecap.app/screens/tQoV4Qj0NQs/00-02-44.png)