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Solution grown single-unit-cell quantum wires affording self-powered solar-blind UV photodetectors with ultrahigh selectivity and sensitivity
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2019-02-04 , DOI: 10.1021/jacs.8b10791 Dong Li 1 , Simeng Hao 1 , Guanjie Xing 1 , Yunchao Li 1 , Xiaohong Li 1 , Louzhen Fan 1 , Shihe Yang 2
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2019-02-04 , DOI: 10.1021/jacs.8b10791 Dong Li 1 , Simeng Hao 1 , Guanjie Xing 1 , Yunchao Li 1 , Xiaohong Li 1 , Louzhen Fan 1 , Shihe Yang 2
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As crystalline semiconductor nanowires are thinned down to a single-unit-cell thickness, many fascinating properties could arise pointing to promising applications in various fields. A grand challenge is to be able to controllably synthesize such ultrathin nanowires. Herein, we report a strategy, which synergizes a soft template with oriented attachment (ST-OA), to prepare high-quality single-unit-cell semiconductor nanowires (SSNWs). Using this protocol, we are able to synthesize for the first time ZnS and ZnSe nanowires (NWs) with only a single-unit-cell thickness (less than 1.0 nm) and a cluster-like absorption feature (i.e., with a sharp, strong, and significantly blue-shifted absorption peak). Particularly, the growth mechanism and the single-unit-cell structure of the as-prepared ZnS SSNWs are firmly established by both experimental observations and theoretical calculations. Thanks to falling into the extreme quantum confinement regime, these NWs are found to only absorb the light with wavelengths shorter than 280 nm (i.e., solar-blind UV absorption). Utilizing such a unique property, self-powered photoelectrochemical-type photodetectors (PEC PDs) based on the ZnS SSNWs are successfully fabricated. The PDs after interface modification with TiO2 exhibit an excellent solar-blind UV photoresponse performance, with a typical on/off ratio of 6008, a detectivity of 1.5 × 1012 Jones, and a responsivity of 33.7 mA/W. This work opens the door to synthesizing and investigating a new dimension of nanomaterials with a wide range of applications.
中文翻译：
溶液生长的单单元量子线提供具有超高选择性和灵敏度的自供电太阳能盲紫外光电探测器
随着晶体半导体纳米线被减薄到单个单元的厚度，许多引人入胜的特性可能会出现，指向各个领域的有前途的应用。一个巨大的挑战是能够可控地合成这种超细纳米线。在此，我们报告了一种策略，该策略将具有定向附着的软模板（ST-OA）协同起来，以制备高质量的单晶电池半导体纳米线（SSNW）。使用该协议，我们能够首次合成只有单晶胞厚度（小于 1.0 nm）和簇状吸收特征（即具有尖锐、强, 和显着蓝移的吸收峰）。特别，所制备的 ZnS SSNW 的生长机制和单晶胞结构已通过实验观察和理论计算得到牢固确立。由于落入极端量子限制状态，发现这些 NW 仅吸收波长短于 280 nm 的光（即日盲紫外线吸收）。利用这种独特的特性，成功制造了基于 ZnS SSNW 的自供电光电化学型光电探测器 (PEC PD)。TiO2界面改性后的PDs表现出优异的日盲紫外光响应性能，典型的开/关比为6008，探测率为1.5×1012琼斯，响应率为33.7 mA/W。这项工作为合成和研究具有广泛应用的纳米材料的新维度打开了大门。
更新日期：2019-02-04
中文翻译：
溶液生长的单单元量子线提供具有超高选择性和灵敏度的自供电太阳能盲紫外光电探测器
随着晶体半导体纳米线被减薄到单个单元的厚度，许多引人入胜的特性可能会出现，指向各个领域的有前途的应用。一个巨大的挑战是能够可控地合成这种超细纳米线。在此，我们报告了一种策略，该策略将具有定向附着的软模板（ST-OA）协同起来，以制备高质量的单晶电池半导体纳米线（SSNW）。使用该协议，我们能够首次合成只有单晶胞厚度（小于 1.0 nm）和簇状吸收特征（即具有尖锐、强, 和显着蓝移的吸收峰）。特别，所制备的 ZnS SSNW 的生长机制和单晶胞结构已通过实验观察和理论计算得到牢固确立。由于落入极端量子限制状态，发现这些 NW 仅吸收波长短于 280 nm 的光（即日盲紫外线吸收）。利用这种独特的特性，成功制造了基于 ZnS SSNW 的自供电光电化学型光电探测器 (PEC PD)。TiO2界面改性后的PDs表现出优异的日盲紫外光响应性能，典型的开/关比为6008，探测率为1.5×1012琼斯，响应率为33.7 mA/W。这项工作为合成和研究具有广泛应用的纳米材料的新维度打开了大门。
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