Abstract Flexible devices have attracted enormous attention in recent years due to the rapid development of portable electronic devices. As a neoteric photodetector, superior performances has already been observed in photoelectrochemical (PEC)-type photodetector. However, the liquid electrolyte inside is not suitable for flexible device fabrication due to the underlying leakage problem. Hence, in this paper, we report a novel flexible self-powered PEC-type photodetector based on 2D Tungsten sulfide (WS2)-graphene heterojunction. By using solid electrolyte as electrons transferring medium, the photodetector presents excellent self-powered capability. Under the condition of illumination intensity of 30 mW cm-2 at the bias voltage of 0 V, the photocurrent can reach 1.4 μA cm-2, while the time response of rise is 1.2 s and the decay time is about 0.9 s. In addition, as the photodetector is made of flexible indium-tin oxide (ITO) substrate, it can work and keep stable under the bending condition. These results provide a route for the preparation of a new flexible self-powered photodetector with simple fabrication processes and low cost.

中文翻译：

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基于二维WS2-石墨烯异质结的柔性自供电光电化学型光电探测器

摘要 近年来，由于便携式电子设备的快速发展，柔性设备引起了极大的关注。作为近代光电探测器，已经在光电化学（PEC）型光电探测器中观察到了优越的性能。然而，由于潜在的泄漏问题，内部的液体电解质不适合柔性器件制造。因此，在本文中，我们报告了一种基于二维硫化钨 (WS2)-石墨烯异质结的新型灵活自供电 PEC 型光电探测器。通过使用固体电解质作为电子传输介质，光电探测器表现出优异的自供电能力。在0 V偏置电压、30 mW cm-2照度条件下，光电流可达1.4 μA cm-2，上升时间响应为1.2 s，衰减时间约为0。9 秒。此外，由于光电探测器由柔性氧化铟锡（ITO）基板制成，因此可以在弯曲条件下工作并保持稳定。这些结果为制备具有简单制造工艺和低成本的新型柔性自供电光电探测器提供了途径。