期刊
ACS NANO
卷 13, 期 3, 页码 3492-3499出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b09649
关键词
InAs nanowires; mid-wavelength infrared photodetection; photoresponsivity; electrostatic field; Franz-Keldysh effect
类别
资金
- National Key R&D Program of China [2016YFB0402401, 2016YFB0402404]
- Royal Society-Newton Advanced Fellowship [NA170214]
- National Natural Science Foundation of China [11634009, 61835012, 61722408]
- Basic Research Programs of Shanghai Science and Technology Commission [16JC1400404]
- Key Programs of Frontier Science of the Chinese Academy of Sciences [QYZDJ-SSW-JSC007]
- Australian Research Council
One-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 x 10(4) A W-1 as well as a corresponding detectivity (D*) of 1.4 x 10(12) cm.Hz(1/2) W-1 at a light wavelength of 3.5 mu m without an applied gate voltage, similar to 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 mu m MWIR light with R of 9.6 x 10(2) A W-1 as well as a corresponding D* of similar to 8.5 x 10(10) cm.Hz(1/2) 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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据