Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
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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