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

doi:10.1088/1674-1056/abe92c

中国物理B ›› 2021, Vol. 30 ›› Issue (10): 104207-104207.doi: 10.1088/1674-1056/abe92c

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

Li Zhang(张力)^1,2,†, Wei-Ning Liu(刘卫宁)^1,2,†, Yan-Zhou Wang(王艳周)^1,2, Qi-Ming Liu(刘奇明)^1,2, Jun-Shuai Li(栗军帅)^1,2,3,‡, Ya-Li Li(李亚丽)^1,2,§, and De-Yan He(贺德衍)^1,2,3

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

收稿日期:2021-01-26 修回日期:2021-02-17 接受日期:2021-02-24 出版日期:2021-09-17 发布日期:2021-09-30
通讯作者: Jun-Shuai Li, Ya-Li Li E-mail:jshli@lzu.edu.cn
基金资助:
Project supported by the Natural Science Foundation of Gansu Province, China (Grant No. 20JR10RA611) and the Fundamental Research Funds for Central Universities, China (Grant Nos. lzujbky-2017-178 and lzujbky-2017-181).

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

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

Received:2021-01-26 Revised:2021-02-17 Accepted:2021-02-24 Online:2021-09-17 Published:2021-09-30
Contact: Jun-Shuai Li, Ya-Li Li E-mail:jshli@lzu.edu.cn
Supported by:
Project supported by the Natural Science Foundation of Gansu Province, China (Grant No. 20JR10RA611) and the Fundamental Research Funds for Central Universities, China (Grant Nos. lzujbky-2017-178 and lzujbky-2017-181).

摘要/Abstract

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:PC₆₁BM blend. The simulation results indicate that comparing with the control device with a planar configuration of ITO/PEDOT:PSS/P3HT:PC₆₁BM (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

Abstract: 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:PC₆₁BM blend. The simulation results indicate that comparing with the control device with a planar configuration of ITO/PEDOT:PSS/P3HT:PC₆₁BM (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.

Key words: light management structures, ITO nanograting, organic solar cells, thin film-based optoelectronic devices

中图分类号: (Gratings)

42.79.Dj

88.40.jr (Organic photovoltaics)

Li Zhang(张力), Wei-Ning Liu(刘卫宁), Yan-Zhou Wang(王艳周), Qi-Ming Liu(刘奇明), Jun-Shuai Li(栗军帅), Ya-Li Li(李亚丽), and De-Yan He(贺德衍). Enhancing light absorption for organic solar cells using front ITO nanograting and back ultrathin Al layer[J]. 中国物理B, 2021, 30(10): 104207-104207.

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

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

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