Optical crosstalk is one of major problems limiting the performance of focal plane arrays based on single photon avalanche diodes (SPADs). In this work, for the first time the crosstalk characteristics of a 4H-SiC SPAD linear array are studied, which is based on a real-time dual channel data acquisition method. It is found that SiC SPAD array exhibits similar crosstalk probability compared with those of InGaAs-based SPAD arrays, which can be effectively reduced by trench isolation between adjacent pixels or by lowering overbias. The average time required for forming a crosstalk event is determined between 7 and 10 ns. As a result, active time-gated operation scheme can be applied for reducing crosstalk.

中文翻译：

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碳化硅紫外单光子雪崩光电二极管阵列串扰分析

光串扰是限制基于单光子雪崩二极管 (SPAD) 的焦平面阵列性能的主要问题之一。在这项工作中，首次研究了基于实时双通道数据采集方法的 4H-SiC SPAD 线阵的串扰特性。结果表明，碳化硅 SPAD 阵列与 InGaAs 基 SPAD 阵列表现出相似的串扰概率，可以通过相邻像素之间的沟槽隔离或降低过偏压来有效降低串扰概率。形成串扰事件所需的平均时间在 7 到 10 ns 之间确定。因此，可以应用主动时间门控操作方案来减少串扰。