Zhang, XutaoHuang, HaiYao, XiaomeiLi, ZiyuanZhou, ChenZhang, XuChen, Ping PingFu, LanZhou, X.Wang, JianluHu, WeidaLu, WeiZou, JinTan, Hark HoeJagadish, Chennupati2020-06-301936-0851http://hdl.handle.net/1885/205647One-dimensional InAs nanowire (NW)-based photodetectors have been widely studied due to their potential application in mid-wavelength infrared (MWIR) photon detection. However, the limited performance and complicated photoresponse mechanism of InAs NW-based photodetectors have held back their true potential for real application. In this study, we developed ferroelectric polymer P(VDF-TrFE)-coated InAs NW-based photodetectors and demonstrated that the electrostatic field caused by polarized ferroelectric materials modifies the surface electron–hole distribution as well as the band structure of InAs NWs, resulting in ultrasensitive photoresponse and a wide photodetection spectral range. Our single InAs NW photodetectors exhibit a high responsivity (R) of 1.6 × 104 A W–1 as well as a corresponding detectivity (D*) of 1.4 × 1012 cm·Hz1/2 W–1 at a light wavelength of 3.5 μm without an applied gate voltage, ∼3–4 orders higher than the maximum value of photoresponsivity reported or commercially used MWIR photodetectors. Moreover, our device shows below band gap photoresponse for 4.3 μm MWIR light with R of 9.6 × 102 A W–1 as well as a corresponding D* of ∼8.5 × 1010 cm·Hz1/2 W–1 at 77 K. Our study shows that this approach is promising for fabrication of high-performance NW-based photodetectors for MWIR photon detection.This study was supported by the National Key R&D Program of China (Grant Nos. 2016YFB0402401 and 2016YFB0402404), the Royal Society-Newton Advanced Fellowship (Grant No. NA170214), the National Natural Science Foundation of China (Grant Nos. 11634009, 61835012, and 61722408), the Basic Research Programs of Shanghai Science and Technology Commission (Grant No. 16JC1400404), the Key Programs of Frontier Science of the Chinese Academy of Sciences (Grant No. QYZDJ-SSWJSC007), and the Australian Research Council.8 pagesapplication/pdfen-AU© 2019 American Chemical SocietyInAs nanowires, mid-wavelength infrared photodetection, photoresponsivity, electrostatic field, Franz−Keldysh effect2019-02-2810.1021/acsnano.8b096492020-01-27