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Title: Enhancing the hot carrier injection of perovskite solar cells by incorporating a molecular dipole interlayer
Authors: Wu, Tai
Zhao, Rongjun
Qiu, Junming
Wang, Shihuai
Zhang, Xiaoliang
Hua, Yong
Keywords: Engineering::Materials
Issue Date: 2022
Source: Wu, T., Zhao, R., Qiu, J., Wang, S., Zhang, X. & Hua, Y. (2022). Enhancing the hot carrier injection of perovskite solar cells by incorporating a molecular dipole interlayer. Advanced Functional Materials, 32(38), 2204450-.
Journal: Advanced Functional Materials
Abstract: Surface passivation engineering of perovskite films via organic functional small molecules has emerged as an effective strategy for improving the efficiency and stability of perovskite solar cells (PSCs). However, a systematic understanding of underlying mechanisms behind these improvements is still missing. In this work, two new naphthalimide-based organic small molecules (PX, X = F, I) are designed and employed to efficiently passivate the surface defects of perovskite films in PSCs. Consequently, superior photovoltaic properties for PI-treated PSCs are achieved with a power conversion efficiency of 23.06%, which is significantly higher than that of the reference device without passivators (20.45%). Theoretical calculations reveal that PX can give rise to interfacial electrical dipole. It is found that incorporating a dipole interlayer between perovskite layer and hole transport layer can enhance ultrafast charge-carrier injection and suppress the charge-carrier recombination in device, which is illustrated by transient absorption spectroscopy. These present results can provide valuable information on the understanding interfacial charge-carrier dynamics in PSCs to further improve the device performance.
ISSN: 1616-301X
DOI: 10.1002/adfm.202204450
Rights: © 2022 Wiley-VCH GmbH. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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