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Few‐Layer Organic Crystalline van der Waals Heterojunctions for Ultrafast UV Phototransistors
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2020-05-11 , DOI: 10.1002/aelm.202000062 Jianhang Guo 1 , Sai Jiang 1 , Mengjiao Pei 1 , Yanling Xiao 2 , Bowen Zhang 1 , Qijing Wang 1 , Ying Zhu 1 , Hengyuan Wang 1 , Jiansheng Jie 2 , Xinran Wang 1 , Yi Shi 1 , Yun Li 1
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2020-05-11 , DOI: 10.1002/aelm.202000062 Jianhang Guo 1 , Sai Jiang 1 , Mengjiao Pei 1 , Yanling Xiao 2 , Bowen Zhang 1 , Qijing Wang 1 , Ying Zhu 1 , Hengyuan Wang 1 , Jiansheng Jie 2 , Xinran Wang 1 , Yi Shi 1 , Yun Li 1
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Organic UV photodetectors using a transistor architecture can yield higher photoresponsivity than diode‐based devices because of the presence of a gate electrode. However, a long‐term issue of these phototransistor devices is the slow response speed, which hinders their practical applications. Here, organic UV phototransistors are constructed using few‐layer organic crystalline van der Waals (vdW) heterojunctions as the photoactive layers. The thickness of the photoactive layers is even less than the exciton diffusion length, thus removing the exciton‐diffusion bottleneck and giving rise to the confinement of charge separation and recombination within the adjacent molecular layers across the heterojunction interface. Hence, the phototransistor devices can exhibit a remarkably enhanced response speed (rise and decay times as short as only ≈4 and 6 ms, respectively). The layer‐dependent photoresponse characteristics are also observed, reinforcing the great importance of few‐layer organic heterostructures in phototransistor devices. This work not only provides a promising avenue toward fast response optoelectronic devices but also presents an in‐depth understanding on the microscopic nature of photogenerated charge carriers at the precision of molecular layers.
中文翻译：
超快紫外光电晶体管的很少层有机晶体范德华异质结
由于栅电极的存在，使用晶体管架构的有机紫外线光电探测器比基于二极管的器件可产生更高的光响应性。然而，这些光电晶体管器件的长期问题是响应速度慢，这阻碍了它们的实际应用。在这里，有机紫外线光电晶体管是使用几层有机晶体范德华（vdW）异质结作为光敏层构建的。光敏层的厚度甚至小于激子扩散长度，因此消除了激子扩散瓶颈，并限制了跨异质结界面的相邻分子层中电荷分离和复合的作用。因此，光电晶体管器件可以表现出显着增强的响应速度（上升和衰减时间分别短至仅≈4ms和6 ms）。还观察到了取决于层的光响应特性，从而增强了光电晶体管器件中几层有机异质结构的重要性。这项工作不仅为快速响应的光电器件提供了有希望的途径，而且还提供了在分子层的精度下对光生电荷载流子的微观性质的深入理解。
更新日期：2020-05-11
中文翻译：
超快紫外光电晶体管的很少层有机晶体范德华异质结
由于栅电极的存在，使用晶体管架构的有机紫外线光电探测器比基于二极管的器件可产生更高的光响应性。然而，这些光电晶体管器件的长期问题是响应速度慢，这阻碍了它们的实际应用。在这里，有机紫外线光电晶体管是使用几层有机晶体范德华（vdW）异质结作为光敏层构建的。光敏层的厚度甚至小于激子扩散长度，因此消除了激子扩散瓶颈，并限制了跨异质结界面的相邻分子层中电荷分离和复合的作用。因此，光电晶体管器件可以表现出显着增强的响应速度（上升和衰减时间分别短至仅≈4ms和6 ms）。还观察到了取决于层的光响应特性，从而增强了光电晶体管器件中几层有机异质结构的重要性。这项工作不仅为快速响应的光电器件提供了有希望的途径，而且还提供了在分子层的精度下对光生电荷载流子的微观性质的深入理解。
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