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

National Science Review 2023年第5期10卷 221-231页

作者： Huanxin Guo Cong Liu Honglong Hu Shuo Zhang Xiaoyu Ji Xiao-Ming Cao Zhijun Ning Wei-Hong Zhu He Tian Yongzhen Wu Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research CenterInstitute of Fine ChemicalsFrontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Chemistry and Molecular EngineeringEast China University of Science and Technology School of Physical Science and Technology Shanghai Tech University

The spontaneous formation of self-assembly monolayer(SAM) on various substrates represents an effective strategy for interfacial engineering of optoele ctronic ***-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 ***,we report for the first time that acidity-weakened boric acid can function as an alternative anchor to construct efficient SAM-based hole-sele ctive contact(HSC) for *** calculations reve al that boric acid spontaneously chemisorbs onto indium tin oxide(ITO) surface with oxygen vacancies facilitating the adsorption *** and electrical measurements indicate that boric acid anchor significantly mitigates ITO *** 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 *** 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 ***-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.

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

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