Organic phototransistors (OPTs) show great promise in optoelectronic applications, including memory devices, logic circuits, and neural networks, due to their effective photoelectric conversion and signal amplification capability. While most OPTs exhibit photomemory behavior, achieving a photoswitching response typically requires specific materials or a unique device structure. However, modulating between photomemory and photoswitching behavior within a single system is crucial for creating versatile, directionally functional devices. In this study, a straightforward approach is demonstrated to tune the response from photomemory to photoswitching in a single OPTs by adjusting the growth process of organic semiconductor. The findings show that the dynamic photoresponse is strongly linked to the film ordering, with reduced crystalline quality favoring photoswitching behavior and highly crystalline quality tending photomemory behavior. This shift correlates closely with changes in the properties and density of trap states in the active layers, as confirmed by Kelvin probe force microscopy (KPFM). Overall, this study introduces a simple, effective method to control the photoresponse of OPTs, enhancing the potential application of organic optoelectronic devices.

中文翻译：

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通过形态控制调节有机光电晶体管的动态光响应行为


有机光电晶体管 （OPT） 具有有效的光电转换和信号放大能力，因此在光电应用中显示出巨大的前景，包括存储器件、逻辑电路和神经网络。虽然大多数 OPT 表现出光记忆行为，但实现光开关响应通常需要特定的材料或独特的器件结构。然而，在单个系统内调节光记忆和光开关行为对于创建多功能、定向功能器件至关重要。在这项研究中，展示了一种简单的方法，通过调整有机半导体的生长过程来调整单个 OPT 中从光记忆到光开关的响应。研究结果表明，动态光响应与薄膜有序密切相关，降低的晶体质量有利于光开关行为，而高度结晶质量倾向于光记忆行为。这种变化与活性层中陷阱态的性质和密度的变化密切相关，开尔文探针力显微镜 （KPFM） 证实了这一点。总体而言，本研究介绍了一种简单、有效的方法来控制 OPTs 的光响应，增强了有机光电器件的潜在应用。