Silicon heterojunction solar cell with interdigitated back contacts for a photoconversion efficiency over 26%
Silicon heterojunction solar cell with interdigitated back contacts for a photoconversion efficiency over 26%
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DOI：
10.1038/nenergy.2017.32
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发表时间：
2017-05-01
期刊：
影响因子：
56.7
通讯作者：
Yamamoto, Kenji
中科院分区：
文献类型：
--
作者：
Yoshikawa, Kunta;Kawasaki, Hayato;Yamamoto, Kenji
提高硅太阳能电池的光电转换效率是进一步部署可再生电力的关键。必须同时提高器件的基本特性，如寿命、串联电阻和光学特性，以减少复合、电阻和光学损耗。在这里，我们使用工业兼容工艺来制造大面积硅太阳能电池，该电池结合了交指背接和非晶硅/晶体硅异质结。在指定面积为180.4 cm(2)的情况下，光转换效率超过26%，比以前25.6%的记录效率提高了2.7%。对电池进行了分析，以表征电池的寿命、量子效率和串联电阻，这些都是转换效率的基本要素。最后，损耗分析指出了一条接近硅太阳电池理论转换效率极限29.1%的途径。
Improving the photoconversion efficiency of silicon solar cells is crucial to further the deployment of renewable electricity. Essential device properties such as lifetime, series resistance and optical properties must be improved simultaneously to reduce recombination, resistive and optical losses. Here, we use industrially compatible processes to fabricate large-area silicon solar cells combining interdigitated back contacts and an amorphous silicon/crystalline silicon heterojunction. The photoconversion efficiency is over 26% with a 180.4 cm(2) designated area, which is an improvement of 2.7% relative to the previous record efficiency of 25.6%. The cell was analysed to characterize lifetime, quantum efficiency, and series resistance, which are essential elements for conversion efficiency. Finally, a loss analysis pinpoints a path to approach the theoretical conversion efficiency limit of Si solar cells, 29.1%.