Enhancing light absorption for organic solar cells using front ITO nanograting and back ultrathin Al layer  

作　　者：Li Zhang Wei-Ning Liu Yan-Zhou Wang Qi-Ming Liu Jun-Shuai Li Ya-Li Li De-Yan He 张力;刘卫宁;王艳周;刘奇明;栗军帅;李亚丽;贺德衍(Key Laboratory of Special Function Materials&Structure Design of the Ministry of Education,Lanzhou University,Lanzhou 730000,China;School of Physical Science&Technology,Lanzhou University,Lanzhou 730000,China;School of Materials&Energy,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]Key Laboratory of Special Function Materials&Structure Design of the Ministry of Education,Lanzhou University,Lanzhou 730000,China [2]School of Physical Science&Technology,Lanzhou University,Lanzhou 730000,China [3]School of Materials&Energy,Lanzhou University,Lanzhou 730000,China

出　　处：《Chinese Physics B》2021年第10期334-341,共8页中国物理B（英文版）

基　　金：supported by the Natural Science Foundation of Gansu Province,China(Grant No.20JR10RA611);the Fundamental Research Funds for Central Universities,China(Grant Nos.lzujbky-2017-178 and lzujbky-2017-181).

摘　　要：To address the discrepancy between carrier collection and light absorption of organic solar cells caused by the limited carrier mobility and optical absorption coefficient for the normally employed organic photoactive layers,a light management structure composed of a front indium tin oxide(ITO)nanograting and ultrathin Al layer inserted in between the photoactive layer and the electron transport layer(ETL)is introduced.Owing to the antireflection and light scattering induced by the ITO nanograting and the suppression of light absorption in the ETL by the inserted Al layer,the light absorption of the photoactive layer is significantly enhanced in a spectral range from 400 nm to 650 nm that also covers the main energy region of solar irradiation for the normally employed active materials such as the P3HT:PC_(61)BM blend.The simulation results indicate that comparing with the control device with a planar configuration of ITO/PEDOT:PSS/P3HT:PC_(61)BM(80-nm thick)/ZnO/Al,the short-circuit current density and power conversion efficiency of the optimized light management structure can be improved by 32.86%and 34.46%.Moreover,good omnidirectional light management is observed for the proposed device structure.Owing to the fact that the light management structure possesses the simple structure and excellent performance,the exploration of such a structure can be believed to be significant in fabricating the thin film-based optoelectronic devices.

关 键 词：light management structures ITO nanograting organic solar cells thin film-based optoelectronic devices 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TB383.1[一般工业技术—材料科学与工程]