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Enhanced Light Emission Performance of Mixed Cation Perovskite Films—The Effect of Solution Stoichiometry on Crystallization

Liu, Fangzhou; Qin, Xinshun; Han, Bing; Chan, Christopher C. S.; Ma, Chao; Leung, Tik Lun; Chen, Wei; He, Yanling; Lončarić, Ivor; Grisanti, Luca; Ovčar, Juraj; Skoko, Željko; Shi, Yingli; Ling, Francis Chi Chung; Huqe, Md Rashedul; Zapien, Juan Antonio; Wang, Shixun; Su, Chun‐Jen; Jeng, U‐Ser; Wong, Kam Sing; Ng, Alan Man Ching; Gu, Meng; Popović, Jasminka; Djurišić, Aleksandra B. (2021) Enhanced Light Emission Performance of Mixed Cation Perovskite Films—The Effect of Solution Stoichiometry on Crystallization. Advanced Optical Materials, 9 (21). ISSN 2195-1071

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The performance of quasi-2D perovskite light emitting diodes (LEDs) with mixed small cations, cesium and formamidinium (FA), is significantly affected by their ratio. The best devices obtained for Cs:FA ratio of 1:1 exhibit a maximum external quantum efficiency (EQE) of 12.1%, maximum luminance of 15 070 cd m−2 and maximum current efficiency of 46.1 cd A−1, which is significantly higher (about 3 times) compared to devices with FA only (maximum EQE of 4.1%, maximum luminance of 4521 cd m−2) and Cs-only (maximum EQE of 4.0%, maximum luminance of 4886 cd m−2). The photoluminescence quantum yield of the Cs:FA 1:1 sample is similarly enhanced, 21.3% compared 5.4% and 6%, for FA-only and Cs-only samples, respectively. It can be observed that the Cs:FA ratio significantly affects the crystallization of the perovskite, with the optimal 1:1 ratio resulting in the formation of tetragonal Cs0.5FA0.5PbBr3 phase (different from cubic FAPbBr3 and orthorhombic CsPbBr3) with pronounced preferential orientation as well as a significant reduction in the trap density, which leads to a substantial improvement in the light-emitting performance.

Item Type: Article
Uncontrolled Keywords: quasi-2D perovskite; light emission; light emitting diodes; mixed small cations
Subjects: NATURAL SCIENCES > Physics > Condensed Matter Physics
NATURAL SCIENCES > Chemistry > Inorganic Chemistry
Divisions: Division of Materials Physics
Project titleProject leaderProject codeProject type
2D i kvazi-2D perovskiti: od ciljanog strukturnog dizajna do poboljšane učinkovitosti i stabilnosti-Željko Skoko; Jasminka PopovićPZS-2019-02-2068HRZZ
Depositing User: Jasminka Popović
Date Deposited: 01 Dec 2022 13:28
DOI: 10.1002/adom.202100393

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