摘要
Understanding the role of perovskite surface passivators in hot carriers transfer dynamics is important to develop highly efficient perovskite solar cells(PSCs).In this work,we have designed and synthesized a naphthalimide-based organic small molecule(NCN)for perovskite surface defect passivator.We reveal that the introduction of NCN not only reduces the density of perovskite defect-state,but also promotes hot carriers(HCs)cooling in perovskite through the transient absorption spectroscopy measurements.Fast HCs cooling permits HCs transfer from perovskite layer into NCN layer,thus resulting in the decreased charge-carrier recombination in NCN-treated device.As expected,the power conversion efficiency(PCE)of PSCs with NCN is enhanced to 22.02%from 19.95%for the control device.The findings are relevant for developing highly efficient PSCs.
基金
High-Level Talents Introduction in Yunnan Province(No.C619300A010)
the Fund for Excellent Young Scholars of Yunnan(No.202001AW070008)
Spring City Plan:the High-level Talent Promotion and Training Project of Kunming(No.2022SCP005)for financial support
support from the Postdoctoral Foundation of Department of Human Resources and Social Security of Yunnan Province(No.C615300504046)
Postdoctoral Research Foundation of Yunnan University(No.W8223004)
the National Natural Science Foundation of China(No.22209144)
the Project of Natural Science Foundation of Yunnan(Nos.202101AU070034 and 202101AT070337)
the Innovation and Entrepreneurship Training Program for college students(No.202110673032)。
