采用改变有机探测器活性层中给受体比例的方法,实现器件工作电压的可调性.研究PBDT-TT-F∶PC61BM∶C60光电倍增型器件中不同PC61BM浓度对空穴隧穿注入电压的影响.在接近600%的外量子效率下,通过调控PC61BM的浓度,既可以获得－3 V较低工作电压器件,也可以获得－6 V较高工作电压器件.结果表明,通过调节活性层中PC61BM的浓度 ,可以改变激子解离率和空穴传输能力,引起阳极对空穴注入电流收集率的变化,最终达到调控工作电压要求. 本文为实现工艺简单、低工作电压且可调的倍增型有机光电探测器提供了参考.

The adjustable working voltage of device is realized by changing the ratio of donor-acceptor in the active layer of the organic detector. The influence mechanism of different PC61BM concentration on the hole tunneling injection voltage in PBDT-TT-F∶PC61BM∶C60 photoelectronics multiplication device was studied. Under the adjacent 600% external quantum efficiency value, by adjusting the concentration of PC61BM, we can obtain a low device operating voltage of －3 V and a high device operating voltage of －6 V. The results show that the hole transport ability and exciton dissociation efficiency of the active layers are changed by adjusting PC61BM concentration, which causes the change of the collection efficiency of hole injection current for anode. Finally, the regulation of device operating voltage is achieved. This paper provides an universal method for obtaining photoelectronics multiplication organic photodetectors with facile fabrication, low and controllable operating voltage.