title: Dual-Layer Nanostructured Flexible Thin-Film Amorphous Silicon Solar Cells with Enhanced Light Harvesting and Photoelectric Conversion Efficiency.
abstract: Three-dimensional (3-D) structures have triggered tremendous interest for thin-film solar cells since they can dramatically reduce the material usage and incident light reflection. However, the high aspect ratio feature of some 3-D structures leads to deterioration of internal electric field and carrier collection capability, which reduces device power conversion efficiency (PCE). Here, we report high performance flexible thin-film amorphous silicon solar cells with a unique and effective light trapping scheme. In this device structure, a polymer nanopillar membrane is attached on top of a device, which benefits broadband and omnidirectional performances, and a 3-D nanostructure with shallow dent arrays underneath serves as a back reflector on flexible titanium (Ti) foil resulting in an increased optical path length by exciting hybrid optical modes. The efficient light management results in 42.7% and 41.7% remarkable improvements of short-circuit current density and overall efficiency, respectively. Meanwhile, an excellent flexibility has been achieved as PCE remains 97.6% of the initial efficiency even after 10 000 bending cycles. This unique device structure can also be duplicated for other flexible photovoltaic devices based on different active materials such as CdTe, Cu(In,Ga)Se2 (CIGS), organohalide lead perovskites, and so forth.
authors.affiliation: Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education, College of Physics and Optoelectronics, Taiyuan University of Technology , Taiyuan 030024, China.|Shanghai Advanced Research Institute, Chinese Academy of Sciences , 99 Haike Road, Zhangjiang Hi-Tech Park, Pudong, Shanghai 201210, China.
authors.forename: Yinyue
authors.initials: Y
authors.lastname: Lin
authors.affiliation: Shanghai Advanced Research Institute, Chinese Academy of Sciences , 99 Haike Road, Zhangjiang Hi-Tech Park, Pudong, Shanghai 201210, China.|University of Chinese Academy of Sciences, Beijing 100039, China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Xu
authors.affiliation: Shanghai Advanced Research Institute, Chinese Academy of Sciences , 99 Haike Road, Zhangjiang Hi-Tech Park, Pudong, Shanghai 201210, China.
authors.forename: Dongliang
authors.initials: D
authors.lastname: Yu
authors.affiliation: Shanghai Advanced Research Institute, Chinese Academy of Sciences , 99 Haike Road, Zhangjiang Hi-Tech Park, Pudong, Shanghai 201210, China.
authors.forename: Linfeng
authors.initials: L
authors.lastname: Lu
authors.affiliation: Shanghai Advanced Research Institute, Chinese Academy of Sciences , 99 Haike Road, Zhangjiang Hi-Tech Park, Pudong, Shanghai 201210, China.
authors.forename: Min
authors.initials: M
authors.lastname: Yin
authors.affiliation: Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon, Hong Kong SAR, China.
authors.forename: Mohammad Mahdi
authors.initials: MM
authors.lastname: Tavakoli
authors.affiliation: Shanghai Advanced Research Institute, Chinese Academy of Sciences , 99 Haike Road, Zhangjiang Hi-Tech Park, Pudong, Shanghai 201210, China.
authors.forename: Xiaoyuan
authors.initials: X
authors.lastname: Chen
authors.affiliation: Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education, College of Physics and Optoelectronics, Taiyuan University of Technology , Taiyuan 030024, China.
authors.forename: Yuying
authors.initials: Y
authors.lastname: Hao
authors.affiliation: Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon, Hong Kong SAR, China.
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Fan
authors.affiliation: Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education, College of Physics and Optoelectronics, Taiyuan University of Technology , Taiyuan 030024, China.
authors.forename: Yanxia
authors.initials: Y
authors.lastname: Cui
authors.affiliation: Shanghai Advanced Research Institute, Chinese Academy of Sciences , 99 Haike Road, Zhangjiang Hi-Tech Park, Pudong, Shanghai 201210, China.
authors.forename: Dongdong
authors.initials: D
authors.lastname: Li
keywords: broadband and omnidirectional performances; flexible; nanopillar membrane; shallow dent arrays; thin-film solar cells