A UV detector based on a planar quadrant electrode structure with a 100-μm isolating cross-gap deposited on chemical vapor deposition diamond was fabricated. An asymmetrical behavior was observed for the amplitude of photocurrent when in forward and reverse bias. A linear relationship between the sum of the photocurrents at biases U and −U, and the light spot position was also observed. The aim of this study is to clarify the mechanism underlying this asymmetrical behavior and exhibit its potential application based on this behavior. A mechanism involving lowering of the contact barrier height between gold and i-diamond by carrier generation upon UV illumination was adopted to account for the photocurrent behavior and confirmed when an opposite asymmetrical photocurrent behavior was observed in other samples. In addition, position-sensitive detection performance, based on this asymmetrical photocurrent behavior, was preliminarily studied. The results exhibited the potential for application as a position-sensitive detector.

中文翻译：

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金-金刚石-金探测器中紫外光斑位置对正向和反向光电流对称性的影响

制造了基于平面象限电极结构的 UV 检测器，该结构具有沉积在化学气相沉积金刚石上的 100-μm 隔离交叉间隙。当处于正向和反向偏置时，观察到光电流幅度的不对称行为。还观察到偏置 U 和 -U 处的光电流总和与光点位置之间的线性关系。本研究的目的是阐明这种不对称行为背后的机制，并展示其基于这种行为的潜在应用。采用一种涉及通过紫外线照射产生载流子降低金和 i-金刚石之间的接触势垒高度的机制来解释光电流行为，并在其他样品中观察到相反的不对称光电流行为时得到证实。此外，初步研究了基于这种不对称光电流行为的位置敏感检测性能。结果显示了作为位置敏感探测器应用的潜力。