近日，大连民族大学的董斌&徐文及其研究团队取得一项新进展。经过不懈努力，他们通过集成量子剪裁发光聚光器实现高DUV到NIR-II响应宽带量子点异质结光电探测器。相关研究成果已于2024年10月15日在国际知名学术期刊《光：科学与应用》上发表。

该研究团队通过基于量子点（QDs）异质结和量子剪裁发光聚光器（QC-LC）的垂直结构，实现了单个光电探测器（PD）在200至1700纳米范围内的宽带光谱响应。通过整合CsPbI₃:Ho³⁺钙钛矿量子点（PQDs）和PbS QDs，设计了一个宽带量子点异质结作为吸收层，以实现400至1700纳米的光谱响应。

同时，采用CsPbCl₃:Cr³⁺, Ce³⁺, Yb³⁺, Er3⁺ PQDs作为发光转换层，构建QC-LC，通过波导效应收集和集中光子能量，从而增强PD在深紫外-紫外（200-400纳米）波段的光子响应。该宽带PD表现出良好的稳定性以及卓越的灵敏度，在260纳米、460纳米和1550纳米波长下的探测率分别为3.19×10¹²琼斯、1.05×10¹³琼斯和2.23×10¹²琼斯。这些发现为构建宽带探测器提供了一种新策略，为未来光电子器件的发展提供了更多机遇。

据悉，低成本、高性能且无需冷却的宽带光电探测器（PD）在光通信等领域具有潜在应用，但实现单个宽带光电探测器从深紫外（DUV）到第二近红外（NIR-II）波段的检测仍是一项巨大挑战。

附：英文原文

Title: Highly DUV to NIR-II responsive broadband quantum dots heterojunction photodetectors by integrating quantum cutting luminescent concentrators

Author: Ding, Nan, Xu, Wen, Liu, Hailong, Jing, Yuhan, Wang, Zewen, Ji, Yanan, Wu, Jinlei, Shao, Long, Zhu, Ge, Dong, Bin

Issue&Volume: 2024-10-15

Abstract: Low-cost, high-performance, and uncooled broadband photodetectors (PDs) have potential applications in optical communication etc., but it still remains a huge challenge to realize deep UV (DUV) to the second near-infrared (NIR-II) detection for a single broadband PD. Herein, a single PD affording broadband spectral response from 200 to 1700nm is achieved with a vertical configuration based on quantum dots (QDs) heterojunction and quantum cutting luminescent concentrators (QC–LC). A broadband quantum dots heterojunction as absorption layer was designed by integrating CsPbI₃:Ho³⁺ perovskite quantum dots (PQDs) and PbS QDs to realize the spectral response from 400 to 1700nm. The QC–LC by employing CsPbCl₃:Cr³⁺, Ce³⁺, Yb³⁺, Er³⁺ PQDs as luminescent conversion layer to collect and concentrate photon energy for boosting the DUV–UV (200–400nm) photons response of PDs by waveguide effect. Such broadband PD displays good stability, and outstanding sensitivity with the detectivity of 3.19×10¹² Jones at 260nm, 1.05×10¹³ Jones at 460nm and 2.23×10¹² Jones at 1550nm, respectively. The findings provide a new strategy to construct broadband detector, offering more opportunities in future optoelectronic devices.

DOI: 10.1038/s41377-024-01604-0

Source: https://www.nature.com/articles/s41377-024-01604-0