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Photovoltaic–Pyroelectric Coupled Effect in Ag2Se/Si Heterojunction for Broad-Band, Ultrafast, Self-Powered, Position-Sensitive Detectors
ACS Photonics ( IF 6.5 ) Pub Date : 2022-05-25 , DOI: 10.1021/acsphotonics.2c00474 Jikui Ma 1 , Mingjing Chen 2 , Shuang Qiao 1 , Jianlong Chang 2 , Guangsheng Fu 1 , Shufang Wang 1
ACS Photonics ( IF 6.5 ) Pub Date : 2022-05-25 , DOI: 10.1021/acsphotonics.2c00474 Jikui Ma 1 , Mingjing Chen 2 , Shuang Qiao 1 , Jianlong Chang 2 , Guangsheng Fu 1 , Shufang Wang 1
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As a result of its high carrier mobility and peculiar phase transition, Ag2Se has been attracting increasing interest for applications that include thermoelectric power generation, solid electrolytes, and resistive random access memory devices. However, the narrow-band gap characteristics and excellent optoelectronic properties of the material are usually neglected or not used well. Here, we report on a simple Ag2Se/p-Si heterostructure position-sensitive detector (PSD) based on the lateral photovoltaic effect (LPE) and investigate the optoelectronic properties of this device for the first time. The broad-band performance, ultrafast response speed, and self-powered operation of the PSD are exploited, and the detector’s response performance is improved drastically by coupling of the photovoltaic and pyroelectric effects. A good linearity was observed for the laser position-dependent lateral photovoltage (LPV) response over a wide spectrum from the visible range to the near-infrared region. The effects of illumination power, laser wavelength, and switching frequency on the transient LPV response when modulated by the pyro-phototronic effect were investigated and discussed systematically, with an enhancement ratio of as large as 1797% being achieved. In addition, the response rise/fall times were reduced to 3/5 μs, respectively. The results presented here enable fundamental comprehension of the pyro-phototronic effect-based PSD and provide an accessible route toward the design and performance optimization of such a PSD.
中文翻译：
用于宽带、超快、自供电、位置敏感探测器的 Ag2Se/Si 异质结中的光伏-热释电耦合效应
由于其高载流子迁移率和特殊的相变，Ag 2 Se 在包括热电发电、固体电解质和电阻随机存取存储器件在内的应用中引起了越来越多的兴趣。然而，材料的窄带隙特性和优异的光电性能通常被忽视或没有得到很好的利用。在这里，我们报告一个简单的 Ag 2基于横向光伏效应（LPE）的Se/p-Si异质结构位置敏感探测器（PSD），并首次研究了该器件的光电特性。利用 PSD 的宽带性能、超快响应速度和自供电运行，通过光电效应和热释电效应的耦合，探测器的响应性能得到显着提高。在从可见光范围到近红外区域的宽光谱范围内，激光位置相关的横向光电压 (LPV) 响应具有良好的线性。系统地研究和讨论了光照功率、激光波长和开关频率对热光电子效应调制时瞬态LPV响应的影响，实现了高达1797%的增强率。此外，响应上升/下降时间分别减少到 3/5 μs。这里介绍的结果使人们能够从根本上理解基于热光电子效应的 PSD，并为这种 PSD 的设计和性能优化提供了一条可行的途径。
更新日期：2022-05-25
中文翻译：
用于宽带、超快、自供电、位置敏感探测器的 Ag2Se/Si 异质结中的光伏-热释电耦合效应
由于其高载流子迁移率和特殊的相变，Ag 2 Se 在包括热电发电、固体电解质和电阻随机存取存储器件在内的应用中引起了越来越多的兴趣。然而，材料的窄带隙特性和优异的光电性能通常被忽视或没有得到很好的利用。在这里，我们报告一个简单的 Ag 2基于横向光伏效应（LPE）的Se/p-Si异质结构位置敏感探测器（PSD），并首次研究了该器件的光电特性。利用 PSD 的宽带性能、超快响应速度和自供电运行，通过光电效应和热释电效应的耦合，探测器的响应性能得到显着提高。在从可见光范围到近红外区域的宽光谱范围内，激光位置相关的横向光电压 (LPV) 响应具有良好的线性。系统地研究和讨论了光照功率、激光波长和开关频率对热光电子效应调制时瞬态LPV响应的影响，实现了高达1797%的增强率。此外，响应上升/下降时间分别减少到 3/5 μs。这里介绍的结果使人们能够从根本上理解基于热光电子效应的 PSD，并为这种 PSD 的设计和性能优化提供了一条可行的途径。
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