King Abdullah University of Science and Technology (KAUST), Physical Sciences and Engineering Division , Thuwal 23955-6900, Saudi Arabia.
Department of Physics, College of Sciences, Princess Nourah bint Abdulrahman University (PNU) , Riyadh 11671, Saudi Arabia.
ACS Appl Mater Interfaces. 2017 Nov 1;9(43):37832-37838. doi: 10.1021/acsami.7b09705. Epub 2017 Oct 17.
A high-performance vertically injected broadband UV-to-IR photodetector based on Gd-doped ZnO nanorods (NRs)/CHNHPbI perovskite heterojunction was fabricated on metal substrates. Our perovskite-based photodetector is sensitive to a broad spectral range, from ultraviolet to infrared light region (λ = 250-1357 nm). Such structure leads to a high photoresponsivity of 28 and 0.22 A/W, for white light and IR illumination, respectively, with high detectivity values of 1.1 × 10 and 9.3 × 10 Jones. Optical characterizations demonstrate that the IR detection is due to intraband transition in the perovskite material. Metal substrate boosts carrier injection, resulting in higher responsivity compared to the conventional devices grown on glass, whereas the presence of Gd increases the ZnO NRs performance. For the first time, the perovskite-based photodetector is demonstrated to extend its detection capability to IR (>1000 nm) with high room temperature responsivity across the detected spectrum, leading to a high-performance ingenious cost-effective UV-to-IR broadband photodetector design for large-scale applications.
基于掺钆氧化锌纳米棒（NRs）/CHNHPbI 钙钛矿异质结的高性能垂直注入宽频带紫外-红外光电探测器在金属衬底上制备而成。我们的基于钙钛矿的光电探测器对从紫外光到红外光区域（λ=250-1357nm）的宽光谱范围敏感。这种结构导致了高光响应度，分别为 28 和 0.22A/W，用于白光和 IR 照明，具有高探测率值 1.1×10 和 9.3×10 琼斯。光学特性表明，IR 检测是由于钙钛矿材料中的能带内跃迁。金属衬底促进了载流子注入，与在玻璃上生长的传统器件相比，具有更高的响应度，而 Gd 的存在则提高了 ZnO NRs 的性能。首次证明，基于钙钛矿的光电探测器能够将其检测能力扩展到 IR（>1000nm），在整个检测光谱范围内具有高室温响应度，从而为大规模应用设计出高性能、经济高效的紫外-IR 宽频带光电探测器。
