Zong Jia, Pan Wanting, Qu Wei, Chen Zhenjun, Yang Bai, Wei Haotong
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, People's Republic of China.
State Key Laboratory of Applied Optics, Changchun Institute of Optics Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, People's Republic of China.
Nano Lett. 2024 Sep 25;24(38):11921-11928. doi: 10.1021/acs.nanolett.4c03187. Epub 2024 Sep 13.
Advanced photodetectors are crucial for high-fidelity optical communication. However, the tradeoff between high external quantum efficiency (EQE) and high light fidelity (Li-Fi) frequency often limits data transmission accuracy and timeliness. Here, we report a photodetector consisting of lead sulfide (PbS) colloidal quantum dots (CQDs) with near-infrared responsiveness and perovskite frameworks responsible for the charge transport to overcome the EQE × Li-Fi constraint. Optimizing the PbS CQDs distribution and trap depth in the perovskite layer enhances charge injection, achieving a device gain of 11892% for 1200 nm photons and a response frequency of 24 kHz at -2 V. The device exhibits a record EQE × Li-Fi frequency product of 10 Hz. We have applied the detector to near-infrared optical communications at a data transfer rate of 2000 bits per second (2 kbps) to demonstrate the advances in high fidelity, the device retains over 98% of the original waveform information in its output.
先进的光电探测器对于高保真光通信至关重要。然而，高外部量子效率（EQE）和高光保真度（Li-Fi）频率之间的权衡常常限制了数据传输的准确性和及时性。在此，我们报道了一种由具有近红外响应性的硫化铅（PbS）胶体量子点（CQD）和负责电荷传输的钙钛矿框架组成的光电探测器，以克服EQE×Li-Fi的限制。优化PbS CQD在钙钛矿层中的分布和陷阱深度可增强电荷注入，对于1200 nm光子实现了11892%的器件增益，在-2 V时响应频率为24 kHz。该器件展现出创纪录的10 Hz的EQE×Li-Fi频率乘积。我们已将该探测器应用于数据传输速率为每秒2000比特（2 kbps）的近红外光通信，以展示高保真方面的进展，该器件在其输出中保留了超过98%的原始波形信息。
