Tuning hot carrier transfer dynamics by perovskite surface modification  

作　　者：Chenghao Ge Peng Wang Pei Yuan Tai Wu Rongjun Zhao Rong Huang Lin Xie Yong Hua 

机构地区：[1]School of Materials and Energy,Yunnan University,Kunming 650091,China [2]Department of Physics,Center for Optoelectronics Engineering Research,Yunnan University,Kunming 650091,China

出　　处：《Chinese Chemical Letters》2024年第10期457-460,共4页中国化学快报（英文版）

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)。

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.

关 键 词：Perovskite solar cells Interface passivation Hot carrier Charge recombination Stability NAPHTHALIMIDE 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TB34[一般工业技术—材料科学与工程]