Fast and sensitive polymer photodetectors with extra high external quantum efficiency and large linear dynamic range at low working voltage bias
Fast and sensitive polymer photodetectors with extra high external quantum efficiency and large linear dynamic range at low working voltage bias
复制标题
快速、灵敏的聚合物光电探测器，在低工作偏压下具有超高的外量子效率和大的线性动态范围
DOI：
10.1016/j.orgel.2018.08.017
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发表时间：
2018
影响因子：
3.2
通讯作者：
Teng Feng
中科院分区：
文献类型：
--
作者：
Wang Yue;Zhu Lijie;Wang Tiening;Hu Yufeng;Deng Zhenbo;Cui Qiuhong;Lou Zhidong;Hou Yanbing;Teng Feng
在响应速度慢或工作电压高的有机光电倍增探测器中，可以获得超过100%的超高量子效率。在这项工作中，一个快速和敏感的聚合物光电导检测器与超过10000%的EQE，这需要一个低的负工作电压约为-0.8 V。在该器件中，聚（3-己基噻吩）（P3 HT）：（苯基-C61-丁酸-甲酯）（PC61 BM）本体异质结（BHJ）膜被用作光活性层与聚乙烯亚胺乙氧基化（PEIE）修饰的ITO电极。通过调整PC61 BM：当P3 HT的质量比从2：3逐渐增加到9：1时，器件的光电探测性能发生了很大的变化：EQE可以达到1000%~ 12000%;响应度可以达到4A/W ~ 54 A/W;探测率可以达到1012 Jones。在这些器件中，优化后的器件具有约12000%的高EQE、24 μs的快速响应时间（上升时间）和79 dB的大线性动态范围（约−0.8 V偏置）。借助透射电子显微镜（TEM）、光辅助电容-电压（C-V）和瞬态光电流测量，研究了器件中富勒烯的浓度效应。该方法为理解和开发具有不同光谱响应的光电倍增型聚合物光电探测器提供了普遍的指导。
An extra high quantum efficiency (EQE) exceeding 100% can be obtained in organic photomultiplication photodetectors which generally exhibit either low response speed or high working voltage. In this work, a fast and sensitive polymer photoconductive detector with an over 10000% EQE is demonstrated, which requires a low negative working voltage of around −0.8 V. In the device, a poly (3-hexylthiophene) (P3HT):(phenyl-C61-butyric-acid-methyl-ester) (PC61BM) bulk heterojunction (BHJ) film is used as the photo-active layer with a polyethylenimine ethoxylated (PEIE) modified ITO electrode. By adjusting the PC61BM: P3HT weight ratio from 2: 3 to 9: 1 gradually in the device, the photodetector performances can be dramatically varied: the EQEs can achieve from about 1000% to 12000%; the responsivities can reach from 4 A/W to 54 A/W; and the detectivities are up to 1012Jones. Among these devices, the optimized device has a high EQE of about 12000%, a fast response time of 24 μs (rise time), and a large linear dynamic range of 79 dB at around −0.8 V bias. With the help of transmission electron microscope images (TEM), light-assisted capacitance-voltage (C-V), and transient photocurrent measurements, the fullerene concentration effect in the device has been investigated. This methodology provides a universal guidance for understanding and developing photomultiplication type polymer photodetectors with various spectral responses.