Nawaz Muhammad Zubair, Xu Liu, Zhou Xin, Javed Muhammad, Wang Jiale, Wu Binhe, Wang Chunrui
College of Science and Shanghai Institute of Intelligent Electronics and Systems, Donghua University, Shanghai 201620, China.
ACS Appl Mater Interfaces. 2023 Mar 10. doi: 10.1021/acsami.2c22219.
Despite numerous studies on broadband photodetectors, the problematic query that remains unaddressed is the limited photoresponsivity while broadening the spectral regime. Here, for the first time, a rational design of a hybrid 1D CdSe nanobelt/2D PbI flake heterojunction device is constructed, which substantially boosts the photocurrent while significantly attenuating the dark current, resulting in improved photodetector figures-of-merit. Thanks to the excellent quality of the nanobelt/flake and built-in electric field at the CdSe/PbI interface heterojunction, photogenerated carriers are promptly segregated and more photoexcitons are accumulated by the respective electrodes, enabling a high responsivity of ∼10 A/W, making this one of the highest values among similar reported hybrid heterojunction photodetectors, together with a large linear dynamic range, superior sensitivity, excellent detectivity and external quantum efficiency, an ultrafast response, and a broadband spectral response range. The similar 1D/2D hybrid heterojunction device architecture assembled on the flexible polyimide tape substrate exhibits excellent folding endurance and mechanical, flexural, and long-term environmental stability. The present device architecture and robust operational stability in an ambient environment reveals that the combination of the present 1D/2D hybrid heterojunction has incredible potential for future flexible photoelectronic devices.
尽管对宽带光电探测器进行了大量研究，但在拓宽光谱范围时仍未解决的一个问题是光响应性有限。在此，首次构建了一种合理设计的一维CdSe纳米带/二维PbI薄片混合异质结器件，该器件在大幅提高光电流的同时显著衰减暗电流，从而改善了光电探测器的品质因数。得益于纳米带/薄片的优异质量以及CdSe/PbI界面异质结处的内建电场，光生载流子迅速分离，更多的光激子被各自的电极积累，实现了约10 A/W的高响应度，这使其成为已报道的类似混合异质结光电探测器中响应度最高的值之一，同时具有大的线性动态范围、卓越的灵敏度、出色的探测率和外量子效率、超快响应以及宽带光谱响应范围。组装在柔性聚酰亚胺胶带基板上的类似一维/二维混合异质结器件架构具有出色的折叠耐久性以及机械、弯曲和长期环境稳定性。当前的器件架构以及在环境中的稳健运行稳定性表明，当前的一维/二维混合异质结组合在未来的柔性光电器件方面具有巨大潜力。
