Photo-enhanced Growth of Lead Halide Perovskite Crystals and Their Electro-optical Properties

Overview

Journal RSC Adv

Publisher Royal Society of Chemistry

Specialty Chemistry

Date 2022 Nov 2

PMID 36320286

Authors

Shiwei Wang

Yixuan Wang

Qi Wei

Junling Wang

Affiliations

Soon will be listed here.

Abstract

Organic-inorganic hybrid perovskites have attracted much attention for opto-electronic applications due to their low trap density, strong light absorption, and superior charge transport performance. Generally, the high efficiency of perovskite electro-optical thin films depends on their high-quality perovskite single crystals. In this work, the external illumination is applied on the perovskite single crystals growing in solution. It was shown that larger size CHNHPbI single crystals can be obtained under illumination conditions. In addition, CHNHPbI films are prepared by a one-step spin coating process under illumination, the crystal size and film quality of which have been obviously improved due to the effect of illumination in the film forming process. The efficiency of the average cells based on CHNHPbI films increased from 15.2% for the normal conditions to 17.7% for the illumination one, which is consistent with the light enhanced growth of CHNHPbI single crystals in their solution. The "photo-inhibition nucleation" mechanism is proposed to explain the light-induced enhancement of perovskite crystal growth.

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