Low‐Temperature Heteroepitaxy of 2D PbI2/Graphene for Large‐Area Flexible Photodetectors. Issue 36 (17th July 2018)

• Record Type: Journal Article
• Authors: Zhang, Jincan; Huang, Yucheng; Tan, Zhenjun; Li, Tianran; Zhang, Yichi; Jia, Kaicheng; Lin, Li; Sun, Luzhao; Chen, Xiwen; Li, Zhenzhu; Tan, Congwei; Zhang, Jinxia; Zheng, Liming; Wu, Yue; Deng, Bing; Chen, Zhaolong; Liu, Zhongfan; Peng, Hailin
• Is Part Of: Advanced materials. Volume 30:Issue 36(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-07-17
• Subjects: flexible photodetector -- graphene -- heteroepitaxy -- imaging -- lead iodide; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.201803194
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: Heterostructures based on graphene and other 2D atomic crystals exhibit fascinating properties and intriguing potential in flexible optoelectronics, where graphene films function as transparent electrodes and other building blocks are used as photoactive materials. However, large‐scale production of such heterostructures with superior performance is still in early stages. Herein, for the first time, the preparation of a submeter‐sized, vertically stacked heterojunction of lead iodide (PbI2 )/graphene on a flexible polyethylene terephthalate (PET) film by vapor deposition of PbI2 on graphene/PET substrate at a temperature lower than 200 °C is demonstrated. This film is subsequently used to fabricate bendable graphene/PbI2 /graphene sandwiched photodetectors, which exhibit high responsivity (45 A W −1 cm −2 ), fast response (35 µs rise, 20 µs decay), and high‐resolution imaging capability (1 µm). This study may pave a facile pathway for scalable production of high‐performance flexible devices. Abstract : Epitaxial growth of 2D PbI2 crystals on a graphene film is reported using a low‐temperature vapor deposition method with a lattice matching design. After a simple one‐step transfer and encapsulation, a graphene/PbI2 /graphene sandwich structure is obtained and fabricated into an ultrathin device with a good flexibility for photodetection and imaging.