All inorganic perovskites are regarded as promising candidates for light-emitting diodes (LEDs) due to their excellent luminescent properties and material stability. However, the film morphology of the perovskite emitting layer has a substantial effect on the device performance of perovskite LEDs (PeLEDs). Herein, we developed a facial method to optimize the film morphology of solution-processed CsPbBr3 films by incorporating a Lewis base of caprylyl sulfobetaine (SB3-10) into the perovskite precursor. The interaction between SB3-10 molecules and metal ions in perovskites could retard the crystallization of the CsPbBr3 film, producing a uniform film with a smooth surface morphology. In addition, the addition of SB3-10 could passivate the defects and traps in the perovskite layer to suppress the nonradiative recombination of the charge carriers. Consequently, the resulting CsPbBr3:SB3-10 based PeLEDs presented a maximum external quantum efficiency of 2.3% with a bright luminance of 23 240 cd m−2 and a maximum current efficiency of 8.45 cd A−1. The finding in this work provides a better understanding of the role of SB3-10 based Lewis base in controlling the surface morphology of the CsPbBr3 films.
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22 April 2019
Research Article|
April 25 2019
Morphology control of CsPbBr3 films by a surface active Lewis base for bright all-inorganic perovskite light-emitting diodes
Yan Jin;
Yan Jin
Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University
, Suzhou, Jiangsu 215123, China
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Shuai Yuan;
Shuai Yuan
Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University
, Suzhou, Jiangsu 215123, China
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Kai-Li Wang;
Kai-Li Wang
Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University
, Suzhou, Jiangsu 215123, China
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Meng Li;
Meng Li
Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University
, Suzhou, Jiangsu 215123, China
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Qiang Wang;
Qiang Wang
Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University
, Suzhou, Jiangsu 215123, China
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Zhao-Kui Wang;
Zhao-Kui Wang
a)
Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University
, Suzhou, Jiangsu 215123, China
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Liang-Sheng Liao
Liang-Sheng Liao
a)
Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University
, Suzhou, Jiangsu 215123, China
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a)
Electronic addresses: zkwang@suda.edu.cn and lsliao@suda.edu.cn
Appl. Phys. Lett. 114, 163302 (2019)
Article history
Received:
February 26 2019
Accepted:
April 11 2019
Citation
Yan Jin, Shuai Yuan, Kai-Li Wang, Meng Li, Qiang Wang, Zhao-Kui Wang, Liang-Sheng Liao; Morphology control of CsPbBr3 films by a surface active Lewis base for bright all-inorganic perovskite light-emitting diodes. Appl. Phys. Lett. 22 April 2019; 114 (16): 163302. https://doi.org/10.1063/1.5094041
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