Ultrabroadband Photodetectors up to 10.6 µm Based on 2D Fe3 O4 Nanosheets

Chujun Yin; Chuanhui Gong; Junwei Chu; Xudong Wang; Chaoyi Yan; Shifeng Qian; Yang Wang; Gaofeng Rao; Hongbo Wang; Yuqing Liu; Xianfu Wang; Jianlu Wang; Weida Hu; Chaobo Li; Jie Xiong

doi:10.1002/adma.202002237

Ultrabroadband Photodetectors up to 10.6 µm Based on 2D Fe₃ O₄ Nanosheets

Adv Mater. 2020 Jun;32(25):e2002237. doi: 10.1002/adma.202002237. Epub 2020 May 13.

Authors

Chujun Yin^{1

2}, Chuanhui Gong³, Junwei Chu³, Xudong Wang⁴, Chaoyi Yan³, Shifeng Qian⁵, Yang Wang³, Gaofeng Rao³, Hongbo Wang³, Yuqing Liu³, Xianfu Wang^{3

4}, Jianlu Wang⁴, Weida Hu⁴, Chaobo Li^{1

2}, Jie Xiong³

Affiliations

¹ Institute of Microelectronics of Chinese Academy of Sciences, Beijing, 100029, P. R. China.
² University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
³ State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, P. R. China.
⁴ State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai, 200083, P. R. China.
⁵ Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing, 100081, P. R. China.

PMID: 32406177
DOI: 10.1002/adma.202002237

Abstract

The ultrabroadband spectrum detection from ultraviolet (UV) to long-wavelength infrared (LWIR) is promising for diversified optoelectronic applications of imaging, sensing, and communication. However, the current LWIR-detecting devices suffer from low photoresponsivity, high cost, and cryogenic environment. Herein, a high-performance ultrabroadband photodetector is demonstrated with detecting range from UV to LWIR based on air-stable nonlayered ultrathin Fe₃ O₄ nanosheets synthesized via a space-confined chemical vapor deposition (CVD) method. Ultrahigh photoresponsivity (R) of 561.2 A W^-1 , external quantum efficiency (EQE) of 6.6 × 10³ %, and detectivity (D*) of 7.42 × 10⁸ Jones are achieved at the wavelength of 10.6 µm. The multimechanism synergistic effect of photoconductive effect and bolometric effect demonstrates the high sensitivity for light with any light intensities. The outstanding device performance and complementary mixing photoresponse mechanisms open up new potential applications of nonlayered 2D materials for future infrared optoelectronic devices.

Keywords: Fe3O4 nanosheets; bolometric effect; long-wavelength infrared; photoconductive effect; ultrabroadband photodetectors.

Abstract

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