高响应度倍增型碳纳米管-有机红光探测器

High Responsiveness Multiply Carbon Nanotubes-organic Red Light Detector

采用溶液旋涂方法将单壁碳纳米管与有机红光材料结合并制作出红光探测器,研究了单壁碳纳米管对PBDTTT-F∶PCBM本体异质结活性层薄膜的影响机理及其红光探测器的光电特性.利用原子力显微镜,荧光光谱和紫外-可见吸收光谱等方法对器件进行性能表征及优化.当单壁碳纳米管为最优掺入比1.5wt%时,在-1V偏置电压时,红光光照下该探测器响应度为535mA/W,比探测率达到3.8×1012 Jones,外量子效率达到104%.结果表明,将单壁碳纳米管与有机红光材料结合,有利于提高有机共轭聚合物的聚集以及结晶度,增强光吸收,可为活性层提供高迁移率的电荷传导通道,优化薄膜互穿网络形貌.同时,利用碳纳米管的多激子产生效应,使得有机光电探测器的光电性能大大改善,外量子效率超过100%,为无机-有机光电探测器的进一步开发提供参考.

A single-walled carbon nanotube combined with an organic red light material by a solution spin coating method to produce a red light detector.The influence mechanism of single-walled carbon nanotubes on PBDTTT-F∶PCBM bulk heterojunction active layer film and the photoelectric properties of red photodetector were studied.The performance of the device was characterized and optimized by atomic force microscopy,fluorescence spectroscopy and ultraviolet-visible absorption spectroscopy.When single-walled carbon nanotube is the optimal doping ratio1.5wt%,the responsivity of the detector is535mA/W under the red light illumination,the detection reaches3.8×10^12Jones,and the external quantum efficiency reaches104%.The results show that the combination of single-walled carbon nanotubes and organic red-light materials can improve the aggregation and crystallinity of organic conjugated polymers and enhance the absorption of light,provide high-mobility charge conduction channels for the active layer and optimize the interpenetrating network morphology.At the same time,the multi-exciton generation effect of carbon nanotubes is utilized,the photoelectric performance of organic photoelectric detectors has been greatly improved,the external quantum efficiency exceeds100%,Providing reference for further development of inorganic-organic photodetectors.