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Published on: November 9, 2015
Spontaneous formation of light-trapping nano-structures for top-illumination organic solar cells
Zheng-Yu Huang1, Si-Wen Chiu, Chang-Wen Chen
1Department of Materials Science and Engineering, National Tsing Hua University, No. 101, Section 2, Kuang-Fu Road, Hsinchu, 30013, Taiwan. hwlin@mx.nthu.edu.tw.
Abstract:
By introduction of nano-structured crystallite capping layers, the power conversion efficiency of top-illumination organic solar cells is improved from 4.2 ± 0.1% to 6.0 ± 0.2%, representing a 44% enhancement. This is caused by the increase in JSC and led by the enhancement in the local E distribution inside the active layers. Comprehensive finite-difference time domain simulation reveals two main reasons for this enhancement: (1) the nano-structured capping layers can be treated as gradient-index films that effectively increase the light entering the devices. (2) The nano-structured capping layers can also diffract the light from original normal-incident paths, hence increasing the absorption length inside the active layers.
