title: Two-Dimensional CH₃NH₃PbI₃ Perovskite: Synthesis and Optoelectronic Application.
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 vapor-phase conversion method to synthesize 2D hybrid organic-inorganic perovskite (i.e., CH3NH3PbI3) nanocrystals as thin as a single unit cell (∼1.3 nm). 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 and 532 nm lasers, showing photoresponsivities of 22 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.
authors.forename: Jingying
authors.initials: J
authors.lastname: Liu
authors.affiliation: Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou 215123, People's Republic of China.
authors.forename: Yunzhou
authors.initials: Y
authors.lastname: Xue
authors.forename: Ziyu
authors.initials: Z
authors.lastname: Wang
authors.forename: Zai-Quan
authors.initials: ZQ
authors.lastname: Xu
authors.forename: Changxi
authors.initials: C
authors.lastname: Zheng
authors.forename: Bent
authors.initials: B
authors.lastname: Weber
authors.forename: Jingchao
authors.initials: J
authors.lastname: Song
authors.affiliation: Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou 215123, People's Republic of China.
authors.forename: Yusheng
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Research School of Engineering, College of Engineering and Computer Science, the Australian National University , Canberra, ACT 2601, Australia.
authors.forename: Yuerui
authors.initials: Y
authors.lastname: Lu
authors.forename: Yupeng
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou 215123, People's Republic of China.
authors.forename: Qiaoliang
authors.initials: Q
authors.lastname: Bao
keywords: hybrid organic−inorganic perovskite; optoelectronic; photodetector; two-dimensional material