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Unraveling the Energy Landscape and Energy Funneling Modulated by Hole Transport Layer for Highly Efficient Perovskite LEDs
Li, Ting1; Xiang, Ting1; Wang, Miaosheng2; Zhang, Wei3; Shi, Jishan4; Shao, Ming4; Xu, Tianfei1; Ahmadi, Mahshid2; Wu, Xiaoyan5; Gao, Zhao5
2021-02-01
摘要Previous reports have demonstrated significant effects of hole transport layer (HTL) on the morphology of quasi-2 dimensional (2D) perovskites, hole injection, and interfacial defect density. However, the effects of HTL on energy landscape and energy funneling of quasi-2D perovskites have not been revealed so far. Herein, the PEA(2)Cs(n-1)Pb(n)Br(3n+1) perovskite films are fabricated on four types of HTLs including poly(9-vinylcarbazole):poly(ethylene oxide) (PVK:PEO), PVK, poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS), and nickel oxide (NiOx). The steady-state and transient absorption spectroscopies reveal that the energy landscape and energy funneling of quasi-2D perovskites vary significantly on different HTLs. All domains with n = 1, 2, 3, and higher order (n >= 4) are formed with desired population ratios on the PVK:PEO HTL, leading to the most efficient energy funneling. Furthermore, the interfacial passivation effect of PEO on the energy funneling process is studied. The light-emitting diodes (LEDs) based on PEA(2)Cs(n-1)Pb(n)Br(3n+1) and PVK:PEO (with an optimized ratio of 5.3:0.7 w/w) HTL result in a maximum luminescence of approximate to 23 110 cd m(-2) and maximum external quantum efficiency of approximate to 11.5%, respectively. This is the best performance reported so far using pure PEA(2)Cs(n-1)Pb(n)Br(3n+1) without perovskite composition modifications. This study provides new insights into the HTL for the development of highly efficient quasi-2D perovskite LEDs.
关键词energy funneling energy landscape hole transport layer n domain distribution quasi-2D perovskite light-emitting diodes
DOI10.1002/lpor.202000495
发表期刊LASER & PHOTONICS REVIEWS
ISSN1863-8880
页码10
通讯作者Zhang, Wei(zhangwei@cigit.ac.cn) ; Wu, Xiaoyan(wuxiaoyan1219@sina.cn) ; Chen, Ping(pingchen@swu.edu.cn)
收录类别SCI
WOS记录号WOS:000613219500001
语种英语