Low-Temperature Heteroepitaxy of 2D PbI2 /Graphene for Large-Area Flexible Photodetectors

Jincan Zhang; Yucheng Huang; Zhenjun Tan; Tianran Li; Yichi Zhang; Kaicheng Jia; Li Lin; Luzhao Sun; Xiwen Chen; Zhenzhu Li; Congwei Tan; Jinxia Zhang; Liming Zheng; Yue Wu; Bing Deng; Zhaolong Chen; Zhongfan Liu; Hailin Peng

doi:10.1002/adma.201803194

Low-Temperature Heteroepitaxy of 2D PbI₂ /Graphene for Large-Area Flexible Photodetectors

Adv Mater. 2018 Jul 17:e1803194. doi: 10.1002/adma.201803194. Online ahead of print.

Authors

Jincan Zhang^{1

2}, Yucheng Huang¹, Zhenjun Tan^{1

2}, Tianran Li¹, Yichi Zhang¹, Kaicheng Jia¹, Li Lin¹, Luzhao Sun^{1

2}, Xiwen Chen³, Zhenzhu Li³, Congwei Tan^{1

2}, Jinxia Zhang¹, Liming Zheng¹, Yue Wu¹, Bing Deng¹, Zhaolong Chen¹, Zhongfan Liu^{1

4}, Hailin Peng^{1

4}

Affiliations

¹ Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
² Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, 100871, China.
³ Soochow Institute for Energy and Materials InnovationS (SIEMIS), College of Physics, Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215006, China.
⁴ Beijing Graphene Institute (BGI), Beijing, 100194, China.

PMID: 30015990
DOI: 10.1002/adma.201803194

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.

Keywords: flexible photodetector; graphene; heteroepitaxy; imaging; lead iodide.