Polarization-sensitive and wide-spectrum photovoltaic detector based on quasi-1D ZrGeTe4 nanoribbon
Polarization-sensitive and wide-spectrum photovoltaic detector based on quasi-1D ZrGeTe4 nanoribbon
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DOI：
10.1002/inf2.12258
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发表时间：
2021-10-19
期刊：
影响因子：
22.7
通讯作者：
Wei, Zhongming
中科院分区：
文献类型：
--
作者：
Bai, Ruixue;Xiong, Tao;Wei, Zhongming
具有面内各向异性和窄带隙的低维半导体材料在近红外（NIR）偏振探测中得到了广泛的应用。然而，由于光电探测器中的高暗电流，窄带隙会引起噪声。本文报道了准一维ZrGeTe 4纳米带基光电探测器，具有低暗电流和宽带偏振检测。通过在ZrGeTe 4纳米晶上蒸发50 nm厚的Au电极来制造光电探测器。得益于ZrGeTe 4纳米晶和Au电极的光伏特性，这些光电探测器可以在没有偏置电压的情况下工作，具有降低的暗电流，并且改善了器件性能。此外，准一维ZrGeTe 4纳米带基光电探测器表现出从可见光（维斯）到近红外区的宽带偏振灵敏度，如625.65 mA W-1的高光响应度，在532 nm处的145.9%的大的外量子效率，和在1064 nm处的光电流各向异性比为2.04。他们表现出一种新的垂直光学反转90度的偏振敏感的光电探测，角度分辨吸收光谱，和方位角相关的反射差显微镜（ADRDM）从维斯的NIR区域，而不是其他nanoribbon基于偏振敏感的光电探测器。这项工作为利用基于低维材料的光伏光电探测器进行宽光谱偏振光电探测铺平了道路。
Low-dimensional semiconductors with in-plane anisotropy and narrow bandgap have been extensively applied to polarized detection in the near-infrared (NIR) region. However, the narrow bandgap can cause noise owing to the high dark current in photodetectors. This article reports quasi-1D ZrGeTe4 nanoribbon-based photodetectors with low dark current and broadband polarization detection. The photodetector was fabricated by evaporating 50-nm-thick Au electrodes on a ZrGeTe4 nanoribbon. Benefiting from the photovoltaic characteristics in the ZrGeTe4 nanoribbon and Au electrodes, these photodetectors can operate without bias voltage, with decreased dark current, and improved device performance. Furthermore, the quasi-1D ZrGeTe4 nanoribbon-based photodetectors demonstrate a polarization sensitivity in a broadband from visible (VIS) to the NIR region, such as a high photoresponsivity of 625.65 mA W-1, large external quantum efficiency of 145.9% at 532 nm, and photocurrent anisotropy ratio of 2.04 at 1064 nm. They exhibit a novel perpendicular optical reversal of 90 degrees in polarization-sensitive photodetection, angle-resolved absorption spectra, and azimuth-dependent reflectance difference microscopy (ADRDM) from VIS to the NIR region, as opposed to other nanoribbon-based polarization-sensitive photodetectors. This work paves the way for utilizing photovoltaic photodetectors based on low-dimensional materials for broad-spectrum polarized photodetection.