Fabrication of pyramidal (111) MAPbBr3 film with low surface defect density using homogeneous quantum-dot seeds

Hyeon Jun Jeong; Seungho Bang; Dae Young Park; Hobeom Jeon; Gon Namkoong; Mun Seok Jeong

doi:10.1039/C9NR10070A

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Fabrication of pyramidal (111) MAPbBr₃ film with low surface defect density using homogeneous quantum-dot seeds†

Hyeon Jun Jeong,^a Seungho Bang,^a Dae Young Park,^a Hobeom Jeon,^a Gon Namkoong

*^b and Mun Seok Jeong

*^a

Author affiliations

* Corresponding authors

^a Department of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea
E-mail: mjeong@skku.edu

^b Department of Electrical and Computer Engineering, Old Dominion University, Applied Research Centre, 12050 Jefferson Avenue, Newport News, USA
E-mail: gnamkoon@odu.edu

Abstract

Nucleation and seeding of organometal halide perovskite (OHP) films have been extensively investigated for forming high-density, large-crystalline, and low-defect films. In this study, CH₃NH₃PbBr₃ (MAPbBr₃) films with a low defect density are synthesized via a molecular exchange mechanism using MAPbBr₃ quantum dots as seeds. The synthesized films exhibit a pyramidal morphology with a (111) crystal plane. The distribution of the (111) plane is controlled by adjusting the seed concentration. The pyramidal MAPbBr₃ films exhibit improved photoluminescence intensity and uniformity compared with films produced using seedless toluene. When the seeds are employed, the surface trap density is reduced by a factor of 3.5, suppressing the photocurrent hysteresis and nonsaturated response of photodetectors. Additionally, the films formed using the seeds have improved stability owing to the chain decomposition reaction induced by electron beam heating.

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Article information

DOI: https://doi.org/10.1039/C9NR10070A
Article type: Communication
Submitted: 18 Nov 2019
Accepted: 12 Dec 2019
First published: 17 Dec 2019

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Nanoscale, 2020,12, 1366-1373

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Fabrication of pyramidal (111) MAPbBr₃ film with low surface defect density using homogeneous quantum-dot seeds

H. J. Jeong, S. Bang, D. Y. Park, H. Jeon, G. Namkoong and M. S. Jeong, Nanoscale, 2020, 12, 1366 DOI: 10.1039/C9NR10070A

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