期刊
ACS NANO
卷 9, 期 6, 页码 6522-6531出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b02432
关键词
hybrid solar cell; heterojunction; surface nanotexturing; charge recombination; light trapping
类别
资金
- National Natural Science Foundation of China [61404144]
- Zhejiang Provincial Natural Science Foundation [LY14F040005]
- Natural Science Foundation of Ningbo [2013A610030]
- One Hundred Person Project of the Chinese Academy of Sciences
- Instrument Developing Project of the Chinese Academy of Sciences [yz201328]
- 'Thousand Young Talents Program of China
Hybrid silicon/polymer solar cells promise to be an economically feasible alternative energy solution for various applications if ultrathin flexible crystalline silicon (c-Si) substrates are used. However, utilization of ultrathin c-Si encounters problems in light harvesting and electronic losses at surfaces, which severely degrade the performance of solar cells. Here, we developed a metal-assisted chemical etching method to deliver front-side surface texturing of hierarchically bowl-like nanopores on 20 mu m c-Si, enabling an omnidirectional light harvesting over the entire solar spectrum as well as an enlarged contact area with the polymer. In addition, a back surface field was introduced on the back side of the thin c-Si to minimize the series resistance losses as well as to suppress the surface recombination by the built high low junction. Through these improvements, a power conversion efficiency (PCE) up to 13.6% was achieved under an air mass 1.5 G irradiation for silicon/organic hybrid solar cells with the c-Si thickness of only about 20 mu m. This PCE is as high as the record currently reported in hybrid solar cells constructed from bulk c-Si, suggesting a design rule for efficient silicon/organic solar cells with thinner absorbers.
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