Teng Huaxiao, Zhang Yu, Zhu Ziqi, Song Dandan, Qiao Bo, Liang Zhiqin, Xu Zheng, Zhao Suling
Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education, Beijing 100044, China.
Institute of Optoelectronics Technology, Beijing Jiaotong University, Beijing 100044, China.
ACS Appl Mater Interfaces. 2024 Sep 25;16(38):51212-51220. doi: 10.1021/acsami.4c06953. Epub 2024 Sep 10.
Dual-band photodetectors (PDs) have attracted extensive research attention due to their great potential for diverse and refreshing application scenarios in full-color imaging, optical communication, and imaging detection. Here, a self-driven dual-band PD without filters and other auxiliary equipment to achieve a narrowband response in Mode 1 and a broadband response in Mode 2 was designed based on carrier-selective transmission narrowing (CSTN). The polymer material poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA), which has the appropriate energy level, was selected to be the carrier-selective transmission layer. In Mode 1, the dual-band PD exhibits a near-infrared (NIR) narrowband response in 750-900 nm, which indicates a responsivity of 360 mA/W, a full-width at half-maximum (fwhm) of 81 nm, and a specific detectivity () of 7.49 × 10 Jones at 810 nm. Simultaneously, in Mode 2, the dual-band PD exhibits a UV-visible-NIR broadband responsivity of 180 mA/W and a specific detectivity () of 3.8 × 10 Jones at 520 nm. Our study provides a reliable idea for the commercial applications of dual-function photodetectors.
双波段光电探测器（PDs）因其在全彩成像、光通信和成像检测等多样且新颖的应用场景中具有巨大潜力而受到广泛的研究关注。在此，基于载流子选择性传输窄化（CSTN）设计了一种无需滤波器和其他辅助设备的自驱动双波段PD，其在模式1下实现窄带响应，在模式2下实现宽带响应。选择具有合适能级的聚合物材料聚[双（4-苯基）（2,4,6-三甲基苯基）胺]（PTAA）作为载流子选择性传输层。在模式1中，双波段PD在750 - 900 nm范围内呈现近红外（NIR）窄带响应，其响应度为360 mA/W，半高宽（fwhm）为81 nm，在810 nm处的比探测率（）为7.49×10琼斯。同时，在模式2中，双波段PD在520 nm处呈现180 mA/W的紫外-可见-近红外宽带响应度和3.8×10琼斯的比探测率（）。我们的研究为双功能光电探测器的商业应用提供了可靠的思路。
