Low Surface Defect of [111] directional MAPbBr3 Film Formed by Homogeneous Nano-Seeds
Hyeon Jun Jeong a b, Seongho Bang a b, Dae Young Park a, Hobeom Jeon a, Gon Namkoong c, Mun Seok Jeong a b
a Department of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea
b Center for Integrated Nanostructure Physics, Institute for Basic Science, Sungkyunkwan University, Suwon 16419, Republic of Korea
c Department of Electrical and Computer Engineering, Old Dominion University, Applied Research Centre, 12050 Jefferson Avenue, Newport News, USA
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, Hyeon Jun Jeong, 237
Publication date: 11th February 2019

 Nucleation or seeding of organometal halide perovskites has been investigated to form high-density, large-crystalline, and low-defect films. This paper introduces the MAPbBr3 film formed by the mechanism that twice molecular exchange by the MAPbBr3 seeds (QDs). The films show a pyramidal morphology with a (111) plane with a clean surface. The distribution of (111) plane formed by seeds and (100) plane formed by toluene is controlled by seed concentration. At the same time, full coverage of the film and a crystal size of about 1 μm were achieved. The pyramidal MAPbBr3 films have improved photoluminescence (PL) intensity and uniformity than the MAPbBr3 films produced by the toluene without seeds. In particular, the surface trap density is reduced by 3.5 times by the seeds, thereby suppressing photocurrent hysteresis and non-saturated response. In addition, the film formed by the seed has improved stability from the chain decomposition reaction by electron beam heating.

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