One-dimensional nanowire is an important candidate for lead-halide perovskite-based photonic detectors and solar cells. Its surface population, diameter, and growth direction, etc., are critical for device performance...One-dimensional nanowire is an important candidate for lead-halide perovskite-based photonic detectors and solar cells. Its surface population, diameter, and growth direction, etc., are critical for device performance. In this research,we carried out a detailed study on electron transfer process at the interface of nanowire CH_(3) NH_(3) PbI_(3)(N-MAPbI_(3))/Phenyl C61 butyric acid methyl-ester synonym(PCBM), as well as the interface of compact CH_(3) NH_(3) PbI_(3)(C-MAPbI_(3))/PCBM by transient absorption spectroscopy. By comparing the carrier recombination dynamics of N-MAPbI_(3), N-MAPbI_(3)/PCBM,C-MAPbI_(3), and C-MAPbI_(3)/PCBM from picosecond(ps) to hundred nanosecond(ns) time scale, it is demonstrated that electron transfer at N-MAPbI_(3)/PCBM interface is less efficient than that at C-MAPbI_(3)/PCBM interface. In addition, electron transfer efficiency at C-MAPbI_(3)/PCBM interface was found to be excitation density-dependent, and it reduces with photo-generation carrier concentration increasing in a range from 1.0 × 1018 cm^(-3)–4.0 × 1018 cm^(-3). Hot electron transfer,which leads to acceleration of electron transfer between the interfaces, was also visualized as carrier concentration increases from 1.0 × 10^(18) cm^(-3)–2.2 × 10^(18) cm^(-3).展开更多
We propose an effective method to fabricate highly efficient organic photovoltaic cells based on poly[N−9"-hepta-decanyl-2,7-carbazole-alt-5,5-(4'7'-di-2-thienyl-2'1'3'-b-enzothiadiazole):[6,6...We propose an effective method to fabricate highly efficient organic photovoltaic cells based on poly[N−9"-hepta-decanyl-2,7-carbazole-alt-5,5-(4'7'-di-2-thienyl-2'1'3'-b-enzothiadiazole):[6,6]-phenyl C71−butyric acid methyl ester(PCDTBT:PC71BM).A power conversion efficiency of as high as 5.6%and a fill factor of 53.7%are achieved from the optimized cells.The influence of surface morphology of the active layer on the performance of the cells is also investigated.展开更多
基金supported by the National Natural Science Foundation of China (Grant Nos. 21503066 and 61904048)the Fundamental Research Project from Shenzhen Science and Technology Innovation Committee (Grant No. JCYJ20180302174021198)+2 种基金the Natural Science Foundation of Hebei ProvinceChina(Grant No. F2017201136)the Foundation of Hebei Educational Committee (Grant No. ZC2016003)。
文摘One-dimensional nanowire is an important candidate for lead-halide perovskite-based photonic detectors and solar cells. Its surface population, diameter, and growth direction, etc., are critical for device performance. In this research,we carried out a detailed study on electron transfer process at the interface of nanowire CH_(3) NH_(3) PbI_(3)(N-MAPbI_(3))/Phenyl C61 butyric acid methyl-ester synonym(PCBM), as well as the interface of compact CH_(3) NH_(3) PbI_(3)(C-MAPbI_(3))/PCBM by transient absorption spectroscopy. By comparing the carrier recombination dynamics of N-MAPbI_(3), N-MAPbI_(3)/PCBM,C-MAPbI_(3), and C-MAPbI_(3)/PCBM from picosecond(ps) to hundred nanosecond(ns) time scale, it is demonstrated that electron transfer at N-MAPbI_(3)/PCBM interface is less efficient than that at C-MAPbI_(3)/PCBM interface. In addition, electron transfer efficiency at C-MAPbI_(3)/PCBM interface was found to be excitation density-dependent, and it reduces with photo-generation carrier concentration increasing in a range from 1.0 × 1018 cm^(-3)–4.0 × 1018 cm^(-3). Hot electron transfer,which leads to acceleration of electron transfer between the interfaces, was also visualized as carrier concentration increases from 1.0 × 10^(18) cm^(-3)–2.2 × 10^(18) cm^(-3).
基金Supported by the Natural Science Foundation of Hebei Province under Grant No F20010000306.
文摘We propose an effective method to fabricate highly efficient organic photovoltaic cells based on poly[N−9"-hepta-decanyl-2,7-carbazole-alt-5,5-(4'7'-di-2-thienyl-2'1'3'-b-enzothiadiazole):[6,6]-phenyl C71−butyric acid methyl ester(PCDTBT:PC71BM).A power conversion efficiency of as high as 5.6%and a fill factor of 53.7%are achieved from the optimized cells.The influence of surface morphology of the active layer on the performance of the cells is also investigated.
