Regulation of the quantum barrier and carrier transport toward high-efficiency quasi-2D Dion-Jacobson tin perovskite solar cells  

作　　者：Huanhuan Yao Chang Shi Tai Wu Shurong Wang Mingyu Yin Liming Ding Yong Hua Feng Hao 

机构地区：[1]School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 611731,Sichuan,China [2]College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China [3]Yunnan Key Laboratory for Micro/Nano Materials&Technology,School of Materials and Energy,Yunnan University,Kunming 650091,Yunnan,China [4]Center for Excellence in Nanoscience(CAS),Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS),National Center for Nanoscience and Technology,Beijing 100190,China

出　　处：《Journal of Energy Chemistry》2024年第8期200-207,I0005,共9页能源化学（英文版）

基　　金：financially supported by the National Key Research and Development Program of China(2022YFE0118400);the National Natural Science Foundation of China(51702038);the Science&Technology Department of Sichuan Province(2020YFG0061);the Recruitment Program for Young Professionals。

摘　　要：Quasi-2D Dion-Jacobson(DJ)tin halide perovskite has attracted much attention due to its elimination of Van der Waals gap and enhanced environmental stability.However,the bulky organic spacers usually form a natural quantum well structure,which brings a large quantum barrier and poor film quality,further limiting the carrier transport and device performance.Here,we designed three organic spacers with different chain lengths(ethylenediamine(EDA),1,3-propanediamine(PDA),and 1,4-butanediamine(BDA))to investigate the quantum barrier dependence.Theoretical and experimental characterizations indicate that EDA with short chain can reduce the lattice distortion and dielectric confinement effect,which is beneficial to the effective dissociation of excitons and the inhibition of trap-free non-radiative relaxation.In addition,EDA cation shows strong interaction with the inorganic octahedron,realizing large aggregates in precursor solution and high-quality films with improved structural stability.Furthermore,femtosecond transient absorption proves that EDA cations can also weaken the formation of small n-phases with large quantum barrier to achieve effective carrier transport between different nphases.Finally,the quasi-2D DJ(EDA)FA_(9)Sn_(10)I_(31)solar cells achieves a 7.07%power conversion efficiency with good environment stability.Therefore,this work sheds light on the regulation of the quantum barrier and carrier transport through the chain length of organic spacer for qua si-2D DJ lead-free perovskites.

关 键 词：Chain lengths Organic spacers Quantum well Carrier transport Lattice distortion 

分 类 号：TM914.4[电气工程—电力电子与电力传动]