Solution-processed Molybdenum Oxide Hole Transport Layer Stabilizes Organic Solar Cells

• Published in: Chinese journal of polymer science Vol. 41; no. 2; pp. 202 - 211
• Main Authors: Liu, Yan-Fu, Zhang, Si-Wen, Li, Yan-Xun, Li, Shi-Lin, Huang, Li-Qing, Jing, Ya-Nan, Cheng, Qian, Xiao, Lin-Ge, Wang, Bo-Xin, Han, Bing, Kang, Jia-Jie, Zhang, Yuan, Zhang, Hong, Zhou, Hui-Qiong
• Format: Journal Article
• Language: English
• Published: Singapore Springer Nature Singapore 01.02.2023; Springer Nature B.V
• Subjects: Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Industrial Chemistry/Chemical Engineering; Low cost; Molybdenum; Molybdenum oxides; Oxidizing agents; Photovoltaic cells; Polymer Sciences; Polymers; Research Article; Solar cells; Storage stability; Surface energy; Thermal stability; Work functions; Molybdenum oxide; Hole transport layer; Stability
• ISSN: 0256-7679; 1439-6203
• DOI: 10.1007/s10118-022-2873-3

The hole transport layer (HTL) affects the device performance and stability of organic solar cells. In this work, a stable molybdenum oxide (MoO x ) hole transport layer with low cost was prepared by adjusting the state of the precursor solution with an alcoholic solution of molybdenum acetylacetonate through an oxidant. The MoO x transport layer has good transmittance with a work function of 5.07 eV and higher surface energy. The PM6:Y6 devices using MoO x HTL achieve a high efficiency of 16.8%. MoO x HTL exhibits good applicability with excellent performance in both ternary and all-polymer systems. Air storage stability T 80 of the all-polymer device using MoO x HTL was over 600 h, much higher than 70 h of the PEDOT:PSS-based device, and its thermal stability at 85 °C and operational stability under light show better stability than that of the PEDOT:PSS hole transport layer. This work provides a facile and low-cost method to fabricate HTL for organic solar cells, which is beneficial to improve their efficiency and stability.