State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China(UESTC), Chengdu 610054, China
Abstract In order to fabricate high-performance inverted perovskite solar cells (PeSCs), an appropriate hole transport layer (HTL) is essential since it will affect the hole extraction at perovskite/HTL interface and determine the crystallization quality of the subsequent perovskite films. Herein, a facile and simple method is developed by adding ethanolamine (ETA) into poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) as HTL. The doping of a low-concentration ETA can efficiently modify the electrical properties of the PEDOT:PSS film and lower the highest occupied molecular orbital (HOMO) level, which is more suitable for the hole extraction from the perovskite to HTL. Besides, ETA-doped PEDOT:PSS will create a perovskite film with larger grain size and higher crystallinity. Hence, the results show that the open-circuit voltage of the device increases from 0.99 V to 1.06 V, and the corresponding power conversion efficiency (PCE) increases from 14.68% to 19.16%. The alkaline nature of ethanolamine greatly neutralizes the acidity of PEDOT:PSS, and plays a role in protecting the anode, leading the stability of the devices to be improved significantly. After being stored for 2000 h, the PCE of ETA-doped PEDOT:PSS devices can maintain 84.2% of the initial value, which is much higher than 67.1% of undoped devices.
Fund: Project supported by the Regional Joint Fund of the Foundation of the National Natural Science Foundation of China (Grant No. U21A20492), the National Natural Science Foundation of China (Grant Nos. 61421002, 61675041, and 51703019), the Sichuan Provincial Science and Technology Program, China (Grant Nos. 2021107, 2019YFG0121, 2019YJ0178, 2020YFG0279, 2020YFG0281, and 2021107), and the Fund from the Sichuan Province Key Laboratory of Display Science and Technology, China.
Zi-Jun Wang(王子君), Jia-Wen Li(李嘉文), Da-Yong Zhang(张大勇), Gen-Jie Yang(杨根杰), and Jun-Sheng Yu(于军胜) Improving efficiency of inverted perovskite solar cells via ethanolamine-doped PEDOT:PSS as hole transport layer 2022 Chin. Phys. B 31 087802
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