Article

2020; 20(3): 425-430

Published online January 9, 2020 https://doi.org/10.1016/j.cap.2020.01.003

Copyright © The Korean Physical Society.

ZnO/Ag/ZnO multilayer transparent electrode for highly-efficient ITO-Free polymer solar cells

Xu R., Yang K., Zang Y.

College of Optical and Electronic Technology, China Jiliang University, Hangzhou, 310018, China; College of Electronics and Information, Hangzhou Dianzi University, Hangzhou, 310018, China

Correspondence to:Zang, Yue
College of Electronics and Information, Hangzhou Dianzi University

Received: October 30, 2019; Accepted: January 4, 2020

Abstract

Ultrathin metal film (UTMF) with a ZnO/Ag/ZnO hybrid structure was used as transparent electrode in a high-efficiency bulk heterojunction system for the fabrication of ITO-free polymer solar cells. The performance of the devices was carefully tuned through optical simulation using transfer matrix method by varying the thickness of ZnO seed layer and thin absorber layer. By employing appropriate device architecture, polymer solar cells fabricated using this UTMF-based electrode show efficiency as high as 9.49%, which is slightly higher compared to that of ITO-based device. From good agreement between the external quantum efficiency and optical modeling, it was found that the optimized microcavity configuration formed in UTMF-based device can greatly enhance the absorbance of the BHJ layer at longer wavelength as well as the favored exciton distribution for better charge transport and collection. © 2020

Keywords: ITO-Free, Polymer solar cells (PSCs), Transparent electrode, Ultrathin metal film

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