title: Realization of 13.6% Efficiency on 20 μm Thick Si/Organic Hybrid Heterojunction Solar Cells via Advanced Nanotexturing and Surface Recombination Suppression.
abstract: 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 μm 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 μm. 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.
authors.affiliation: †Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, People's Republic of China.
authors.forename: Jian
authors.initials: J
authors.lastname: He
authors.affiliation: †Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, People's Republic of China.
authors.forename: Pingqi
authors.initials: P
authors.lastname: Gao
authors.affiliation: †Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, People's Republic of China.
authors.forename: Mingdun
authors.initials: M
authors.lastname: Liao
authors.affiliation: †Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, People's Republic of China.
authors.forename: Xi
authors.initials: X
authors.lastname: Yang
authors.affiliation: †Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, People's Republic of China.
authors.forename: Zhiqin
authors.initials: Z
authors.lastname: Ying
authors.affiliation: †Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, People's Republic of China.
authors.forename: Suqiong
authors.initials: S
authors.lastname: Zhou
authors.affiliation: †Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, People's Republic of China.
authors.forename: Jichun
authors.initials: J
authors.lastname: Ye
authors.affiliation: ‡Department of Material Science and Engineering, Stanford University, Stanford, California 94305, United States.
authors.forename: Yi
authors.initials: Y
authors.lastname: Cui
keywords: charge recombination; heterojunction; hybrid solar cell; light trapping; surface nanotexturing