Rana Aniket, Park Song Yi, Labanti Chiara, Fang Feifei, Yun Sungyoung, Dong Yifan, Yang Emily J, Nodari Davide, Gasparini Nicola, Park Jeong-Il, Shin Jisoo, Minami Daiki, Park Kyung-Bae, Kim Ji-Seon, Durrant James R
Department of Chemistry and Centre for Processable Electronics, Imperial College London, London, W12 0BZ, UK.
Department of Physics and Centre for Processable Electronics, Imperial College London, London, SW7 2AZ, UK.
Nat Commun. 2024 Jun 13;15(1):5058. doi: 10.1038/s41467-024-49169-1.
In this study, high-performance organic photodetectors are presented which utilize a pristine chlorinated subphthalocyanine photoactive layer. Optical and optoelectronic analyses indicate that the device photocurrent is primarily generated through direct charge generation within the chlorinated subphthalocyanine layer, rather than exciton separation at layer interfaces. Molecular modelling suggests that this direct charge generation is facilitated by chlorinated subphthalocyanine high octupole moment (-80 DÅ), which generates a 200 meV shift in molecular energetics. Increasing the thickness of chlorinated subphthalocyanine leads to faster response time, correlated with a decrease in trap density. Notably, photodetectors with a 50 nm thick chlorinated subphthalocyanine photoactive layer exhibit detectivities approaching 10 Jones, with a dark current below 10 A cm up to -5 V. Based on these findings, we conclude that high octupole moment molecular semiconductors are promising materials for high-performance organic photodetectors employing single-component photoactive layer.
在本研究中，展示了一种高性能有机光电探测器，其利用了原始的氯化亚酞菁光活性层。光学和光电分析表明，该器件的光电流主要通过氯化亚酞菁层内的直接电荷产生，而非层界面处的激子分离产生。分子建模表明，这种直接电荷产生是由氯化亚酞菁的高八极矩（-80 DÅ）促成的，其在分子能量学中产生了200 meV的位移。增加氯化亚酞菁的厚度会导致响应时间加快，这与陷阱密度的降低相关。值得注意的是，具有50 nm厚氯化亚酞菁光活性层的光电探测器的探测率接近10 Jones，在高达-5 V时暗电流低于10 A cm²。基于这些发现，我们得出结论，高八极矩分子半导体是用于采用单组分光活性层的高性能有机光电探测器的有前途的材料。
