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Light Detection in Open-Circuit Voltage Mode of Organic Photodetectors

机译：有机光电探测器开路电压模式下的光检测

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摘要

Organic photodetectors (OPDs) are promising candidates for next-generation light sensors as they combine unique material properties with high-level performance in converting photons into electrical signals. However, low-level light detection with OPD is often limited by device dark current. Here, the open-circuit voltage (V-oc) regime of OPDs is shown to be efficient for detecting low light signals (<100 mu W cm(-2)). It is established that the light-dependence of V-oc exhibits two distinct regimes as function of irradiance: linear and logarithmic. Whereas the observed logarithmic regime is well understood in organic photovoltaic cells (OPVs), it is shown experimentally and theoretically that the linear regime is due to the non-infinite shunt resistance of the OPD device. Overall, OPDs composed of rubrene and fullerene show photovoltage light sensitivity across nine orders of magnitude with a detection limit as low as 400 pW cm(-2). A photovoltage responsivity of 1.75 V m(2) W-1 demonstrates highly efficient performance without the necessity to supress high dark current. This approach opens up new possibilities for resolving low light signals and provides simplified design rules for OPDs.
机译：有机光电探测器（OPD）是下一代光传感器的有希望的候选者，因为它们将独特的材料特性与将光子转换为电信号的高级性能相结合。但是，使用OPD进行的低级光检测通常受到设备暗电流的限制。在这里，OPD的开路电压（V-oc）状态显示为可有效检测弱光信号（<100μW cm（-2））。已经确定，V-oc的光依赖性表现出两种不同的辐照度函数：线性和对数。尽管在有机光伏电池（OPV）中可以很好地理解所观察到的对数形式，但从实验和理论上表明，线性形式是由于OPD器件的非无限分流电阻引起的。总体而言，由红荧烯和富勒烯组成的OPD表现出跨越9个数量级的光电压光敏性，检出限低至400 pW cm（-2）。 1.75 V m（2）W-1的光电压响应度显示出高效的性能，而不必抑制高的暗电流。这种方法为解析弱光信号开辟了新的可能性，并为OPD提供了简化的设计规则。

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