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CsPbBr3/CH3NH3PbCl3 Double Layer Enhances Efficiency and Lifetime of Perovskite Light-Emitting Diodes
ACS Energy Letters ( IF 22.0 ) Pub Date : 2020-06-05 , DOI: 10.1021/acsenergylett.0c01036
Dong-Ho Kang 1 , Seul-Gi Kim 1 , Yong Churl Kim 2 , In Taek Han 2 , Ho Jin Jang 1 , Jun Yeob Lee 1 , Nam-Gyu Park 1
Affiliation  

At present, perovskite light-emitting diodes are mostly based on various forms of nanostructures exploiting their exciton confinement property. However, the few reports utilizing bulk or polycrystalline perovskites have been limited in application because of the difficulties of forming high-quality films, especially on the existing organic charge transport layers. When these charge transport organics are exchanged with thicker CH3NH3PbCl3, the emitting CsPbBr3 thick polycrystalline films containing CH3NH3Br are conformally deposited with improved luminescence quality without driving voltage increase. Enhanced crystallinity and prolonged photoluminescence are observed by exploiting interfacial defect passivation and the strain-induced effect in the heterostructures. This approach could lead to high-performance light-emitting diodes and may also be extended to other perovskite devices.

中文翻译:

CsPbBr 3 / CH 3 NH 3 PbCl 3双层提高钙钛矿发光二极管的效率和寿命

目前,钙钛矿发光二极管主要利用其激子限制性质而基于各种形式的纳米结构。然而,由于难以形成高质量的膜,特别是在现有的有机电荷传输层上,难以利用块状或多晶钙钛矿的报道受到限制。当这些电荷传输有机物与较厚的CH 3 NH 3 PbCl 3交换时,发射出的CsPbBr 3厚的含有CH 3 NH 3的多晶膜在不增加驱动电压的情况下,以改善的发光质量共形沉积Br。通过利用界面缺陷钝化和异质结构中的应变诱导效应,观察到增强的结晶度和延长的光致发光。这种方法可以产生高性能的发光二极管,并且还可以扩展到其他钙钛矿设备。
更新日期:2020-07-10
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