文献类型：期刊文献

英文题名：Neglected acidity pitfall: boric acid-anchoring hole-selective contact for perovskite solar cells

作者：Guo, Huanxin[1,2];Liu, Cong[1,2];Hu, Honglong[1,2];Zhang, Shuo[1,2];Ji, Xiaoyu[1,2];Cao, Xiao-Ming[1,2];Ning, Zhijun[3];Zhu, Wei-Hong[1,2];Tian, He[1,2];Wu, Yongzhen[1,2]

机构：[1]East China Univ Sci & Technol, Inst Fine Chem, Feringa Nobel Prize Scientist Joint Res Ctr, Frontiers Sci Ctr Materiobiol & Dynam Chem,Sch Che, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Inst Fine Chem, Feringa Nobel Prize Scientist Joint Res Ctr, Frontiers Sci Ctr Materiobiol & Dynam Chem,Sch Che, Shanghai 200237, Peoples R China;[3]Shanghai Tech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China

年份：2023

卷号：10

期号：5

外文期刊名：NATIONAL SCIENCE REVIEW

收录：;EI(收录号：20232514257695);WOS:【SCI-EXPANDED(收录号:WOS:001002759200001)】；

基金：This work was supported by the National Natural Science Foundation of China (22179037, 22022302 and 92045303), Program of Introducing Talents of Discipline to Universities (B16017), Innovation Program of Shanghai Municipal Education Commission (2021-01-07-00-02-E00107) and Shanghai Municipal Science and Technology Major Project (2018SHZDZX03 and 21JC1401700).

语种：英文

外文关键词：perovskite solar cells; hole-selective contact; boric acid anchor; acid-induced degradation; long-term stability

摘要：The spontaneous formation of self-assembly monolayer (SAM) on various substrates represents an effective strategy for interfacial engineering of optoelectronic devices. Hole-selective SAM is becoming popular among high-performance inverted perovskite solar cells (PSCs), but the presence of strong acidic anchors (such as -PO3H2) in state-of-the-art SAM is detrimental to device stability. Herein, we report for the first time that acidity-weakened boric acid can function as an alternative anchor to construct efficient SAM-based hole-selective contact (HSC) for PSCs. Theoretical calculations reveal that boric acid spontaneously chemisorbs onto indium tin oxide (ITO) surface with oxygen vacancies facilitating the adsorption progress. Spectroscopy and electrical measurements indicate that boric acid anchor significantly mitigates ITO corrosion. The excess boric acid containing molecules improves perovskite deposition and results in a coherent and well-passivated bottom interface, which boosts the fill factor (FF) performance for a variety of perovskite compositions. The optimal boric acid-anchoring HSC (MTPA-BA) can achieve power conversion efficiency close to 23% with a high FF of 85.2%. More importantly, the devices show improved stability: 90% of their initial efficiency is retained after 2400 h of storage (ISOS-D-1) or 400 h of operation (ISOS-L-1), which are 5-fold higher than those of phosphonic acid SAM-based devices. Acidity-weakened boric acid SAMs, which are friendly to ITO, exhibits well the great potential to improve the stability of the interface as well as the device.