Zeng Wenxin, Duan Zaihua, Bu Yichen, Yu Haichao, Wang Changhong, Tang Xing, Yang Jingwen, Yuan Zhen, Jiang Yadong, Tai Huiling
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 611731, China.
49th Research Institute of China Electronics Technology Group Corporation, Harbin 150028, China.
Mater Horiz. 2025 Mar 31;12(7):2179-2186. doi: 10.1039/d4mh01925c.
Optoelectronic logic gates (OELGs) have become one of the excellent candidates for logic devices in the post Moore era, with great potential for complex optical computing, secure optical communication, and image processing. As an important component of OELGs, bipolar photodetectors (BPDs) face problems such as limited logic functionality, narrow response range, slow response speed, and high-power consumption. Here, we propose a self-powered BPD with a back-to-back structure based on HgTe quantum dot (QD) and organic material PBDB-T:Y6 stacking. The results show that the BPD exhibits a broadband bipolar photoresponse (300-1800 nm) under a bias voltage of 0 V, with a rapid response speed in the microsecond range. By modulating the device with three light sources within the positive and negative photoresponse wavelength ranges, the HgTe QDs/PBDB-T:Y6 BPD successfully achieves five logic gate operations ("OR", "AND", "NAND", "NOR", and "NOT"). Based on excellent fast and broadband bipolar optoelectronic response, we further confirm the potential application of the HgTe QDs/PBDB-T:Y6 BPD in broadband optical communication encryption. This work provides a useful reference for the combination of QDs and organic materials in the development of high-performance BPDs.
光电逻辑门（OELGs）已成为后摩尔时代逻辑器件的优秀候选者之一，在复杂光学计算、安全光通信和图像处理方面具有巨大潜力。作为OELGs的重要组成部分，双极光电探测器（BPDs）面临逻辑功能有限、响应范围窄、响应速度慢和功耗高等问题。在此，我们提出一种基于HgTe量子点（QD）和有机材料PBDB-T:Y6堆叠的背靠背结构自供电BPD。结果表明，该BPD在0 V偏置电压下表现出宽带双极光响应（300 - 1800 nm），响应速度在微秒范围内很快。通过在正负光响应波长范围内用三个光源调制该器件，HgTe QDs/PBDB-T:Y6 BPD成功实现了五种逻辑门操作（“或”、“与”、“与非”、“或非”和“非”）。基于出色的快速和宽带双极光电响应，我们进一步证实了HgTe QDs/PBDB-T:Y6 BPD在宽带光通信加密中的潜在应用。这项工作为量子点和有机材料在高性能BPDs开发中的结合提供了有用的参考。
