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Solar cell with 26.33% conversion efficiency
Schematic diagram of a structure using heterojunction and back contact
NEDO announced on September 14, 2016 that the conversion efficiency of crystalline silicon solar cells (power generating elements) of practical size (180cm2) has reached the world's highest 26.33%.
The unit uses a heterojunction and back contact structure, which is about 0.7% higher than the original world record of 25.6%, and exceeded 26% for the first time.
The unit was developed by Zhonghua in NEDO's “High-performance, High-Reliability Photovoltaic Generation Power Generation Cost Reduction Technology Development†project.
A heterojunction is a technique of joining together semiconductor materials having different characteristics. This time, crystalline silicon and amorphous silicon are combined together. Both materials can convert different wavelengths of light into electricity, which can increase conversion efficiency.
The back contact is a technology that forms electrodes only on the back of a solar cell, thereby obtaining power with high efficiency. The common solar cell has electrodes on the front surface, so the light receiving area will be reduced accordingly. By concentrating the electrodes on the back surface, the light-receiving surface is enlarged, thereby improving conversion efficiency.
The newly-developed battery cells combine Bell's heterojunction technology using amorphous silicon, a technology that reduces the series resistance of the electrodes, and back contact technology that can use sunlight more efficiently, achieving high conversion efficiency.
Zhonghua plans to use this result to launch solar panel products.
NEDO and Chungwa intend to realize electricity costs of 14 yen/kWh by 2020 and 7 yen/kWh by 2030. To this end, we will actively develop technologies that can produce solar cells with high efficiency and high reliability at low cost. (Reporter: Shinichi Kato, Nikkei BP Institute of Clean Technology)
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