Chen Yongjie, Zheng Yingqi, Wang Jing, Zhao Xuan, Liu Guanhao, Lin Yi, Yang Yubo, Wang Lixiang, Tang Zheng, Wang Ying, Fang Yanjun, Zhang Wenkai, Zhu Xiaozhang
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Haidian District, Beijing, China.
School of Chemical Sciences, University of Chinese Academy of Sciences, Haidian District, Beijing, China.
Sci Adv. 2024 Jun 7;10(23):eadm9631. doi: 10.1126/sciadv.adm9631. Epub 2024 Jun 5.
Short-wavelength infrared (SWIR) light detection plays a key role in modern technologies. Emerging solution-processed organic semiconductors are promising for cost-effective, flexible, and large-area SWIR organic photodiodes (OPDs). However, the spectral responsivity () and specific detectivity (*) of SWIR OPDs are restricted by insufficient exciton dissociation and high noise current. In this work, we synthesized an SWIR small molecule with a spectral coverage of 0.3 to 1.3 micrometers peaking at 1100 nanometers. The photodiode, with optimized exciton dissociation, charge injection, and SWIR transmittance, achieves a record high of 0.53 ampere per watt and * of 1.71 × 10 Jones at 1110 nanometers under zero bias. The * at 1 to 1.2 micrometers surpasses that of the uncooled commercial InGaAs photodiode. Furthermore, large-area semitransparent all-organic upconversion devices integrating the SWIR photodiode realized static and dynamic SWIR-to-visible imaging, along with excellent upconversion efficiency and spatial resolution. This work provides alternative insights for developing sensitive organic SWIR detection.
短波红外（SWIR）光探测在现代技术中起着关键作用。新兴的溶液处理有机半导体有望用于经济高效、灵活且大面积的SWIR有机光电二极管（OPD）。然而，SWIR OPD的光谱响应度（）和比探测率（*）受到激子解离不足和高噪声电流的限制。在这项工作中，我们合成了一种光谱覆盖范围为0.3至1.3微米、峰值位于1100纳米的SWIR小分子。该光电二极管通过优化激子解离、电荷注入和SWIR透过率，在零偏压下于1110纳米处实现了创纪录的高响应度0.53安培每瓦特和比探测率1.71×10琼斯。在1至1.2微米处的比探测率超过了非制冷商用InGaAs光电二极管。此外，集成了SWIR光电二极管的大面积半透明全有机上转换器件实现了静态和动态的SWIR到可见光成像，以及出色的上转换效率和空间分辨率。这项工作为开发灵敏的有机SWIR探测提供了新的见解。
