Centimeter-scale 2D perovskite (PEA)2PbBr4 single crystal plates grown by a seeded solution method for photodetectors. Issue 29 (29th May 2019)

• Record Type: Journal Article
• Authors: Ge, Chaoyang; Zhai, Wenhao; Tian, Cheng; Zhao, Shiqi; Guo, Tong; Sun, Shuren; Chen, Weixi; Ran, Guangzhao
• Is Part Of: RSC advances. Volume 9:Issue 29(2019)
• Page Start: 16779
• Page End: 16783
• Publication Date: 2019-05-29
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c9ra01415b
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : We report a seeded solution method for the growth of centimeter-scale (PEA)2 PbBr4 single crystals and their application in photodetectors. Abstract : Large-sized single-crystal two-dimensional (2D) perovskites are highly desirable owing to their fundamental properties and intriguing ability to boost devices. Herein, 2-phenylethylammonium lead bromide [(PEA)2 PbBr4 ] single crystals, which are a violet-light-emitting 2D perovskite material, with typical lateral sizes of about one centimeter were successfully grown using a seeded solution method. The single-crystal plates showed a well-defined shape (rectangle or hexagon), a natural thickness (300–500 μm) similar to that of conventional silicon and InP wafers, a large aspect ratio of ∼20, and a smooth surface (root mean square, ∼0.7 nm). We integrated these single crystal plates into an ultraviolet photodetector, achieving a low dark current of ∼10 −13 A and an efficient photoresponse (on/off ratio, ∼10 3 ). This experiment could easily be extended to grow freestanding 2D perovskite single crystals on a wafer scale for practical integrated optoelectronics.