标题： 分子聚集体耦合石墨烯光电晶体管中的可调光栅效应 显示英文标题

标题： Tunable photogating in a molecular aggregate coupled graphene phototransistor

摘要： 我们展示了一种耦合到有机半导体聚集层的石墨烯光电探测器。一种石墨烯光电晶体管被一层若丹明分子的薄膜覆盖。分子层的聚集可以通过沉积参数和后沉积退火来控制，从而获得从非晶态到高度聚集态的薄膜。分子层具有单轴结构，其激子跃迁的跃迁偶极矩定义明确。分子层的存在导致光电晶体管的响应大幅增加。我们进一步证明，信号增强是由于石墨烯的p型光掺杂。光谱光电响应表明，单体和分子聚集体的光掺杂过程不同。我们的光电探测器是一个平台，用于研究分子聚集和有序性对聚集有机半导体与二维材料之间电荷传输过程的影响。 显示英文摘要

摘要： We present a graphene photodetector coupled to a layer of aggregated organic semiconductor. A graphene phototransistor is covered with a thin film of merocyanine molecules. The aggregation of the molecular layer can be controlled by the deposition parameters and post-deposition annealing to obtain films ranging from amorphous to a highly aggregated state. The molecular layer has a uniaxial structure with excitonic transitions whose transition dipole moments are well defined. The presence of the molecular layer results in an enormous increase in the response of the phototransistor. We further demonstrate that the signal-enhancement is due to p-photodoping of the graphene. The spectroscopic photoresponse suggests that the photodoping via monomers and molecular aggregates takes place differently. Our photodetector is a platform to study the influence of molecular aggregation and order on charge transport processes between aggregated organic semiconductors and two-dimensional materials.