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American Chemical Society, ACS Nano, 3(10), p. 3536-3542, 2016

DOI: 10.1021/acsnano.5b07791

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Two-Dimensional CH3NH3PbI3 Perovskite: Synthesis and Optoelectronic Application

This paper is available in a repository.
This paper is available in a repository.

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Abstract

Hybrid organic-inorganic perovskite materials have received substantial research attention due to their impressively high performance in photovoltaic devices. As one of the oldest functional materials, it is intriguing to explore the optoelectronic properties in perovskite after reducing it into a few atomic layers in which two-dimensional (2D) confinement may get involved. In this work, we report a combined solution process and vapour phase conversion method to synthesize 2D hybrid organic-inorganic perovskite (i.e., CH3NH3PbI3) nanocrystals as thin as single unit cell (~1.3 nm). The high-quality 2D perovskite crystals have triangle and hexagonal shapes, exhibiting tunable photoluminescence while the thickness or composition is changed. Due to the high quantum efficiency and excellent photoelectric properties in 2D perovskites, a high performance photodetector was demonstrated, in which the current can be enhanced significantly by shining 405 nm and 532 nm lasers, showing photoresponsivities of 22 AW-1 and 12 AW-1 with a voltage bias of 1 V, respectively. The excellent optoelectronic properties make 2D perovskites building blocks to construct 2D heterostructures for wider optoelectronic applications.