Opt Express. 2023 Feb 27;31(5):8428-8439. doi: 10.1364/OE.485279.
The flexible photodetector is viewed as a research hotspot for numerous advanced optoelectronic applications. Recent progress has manifested that lead-free layered organic-inorganic hybrid perovskites (OIHPs) are highly attractive to engineering flexible photodetectors due to the effective overlapping of several unique properties, including efficient optoelectronic characteristics, exceptional structural flexibility, and the absence of Pb toxicity to humans and the environment. The narrow spectral response of most flexible photodetectors with lead-free perovskites is still a big challenge to practical applications. In this work, we demonstrate the flexible photodetector based on a novel (to our knowledge) narrow-bandgap OIHP of (BA)(MA)SnI, with achieving a broadband response across an ultraviolet-visible-near infrared (UV-VIS-NIR) region as 365-1064 nm. The high responsivities of 28.4 and 2.0 × 10 A/W are obtained at 365 and 1064 nm, respectively, corresponding to detectives of 2.3 × 10 and 1.8 × 10 Jones. This device also shows remarkable photocurrent stability after 1000 bending cycles. Our work indicates the huge application prospect of Sn-based lead-free perovskites in high-performance and eco-friendly flexible devices.
柔性光电探测器被视为众多先进光电应用的研究热点。最近的研究进展表明，由于具有几种独特性质的有效重叠，无铅层状有机-无机杂化钙钛矿（OIHPs）对于工程柔性光电探测器极具吸引力，这些性质包括高效光电特性、卓越的结构灵活性以及不存在对人类和环境的 Pb 毒性。大多数具有无铅钙钛矿的柔性光电探测器的窄光谱响应仍然是实际应用的一大挑战。在这项工作中，我们展示了基于新型（据我们所知）窄带隙 OIHP（BA）（MA）SnI 的柔性光电探测器，实现了 365-1064nm 的宽光谱响应，包括紫外-可见-近红外（UV-VIS-NIR）区域。在 365nm 和 1064nm 处，分别获得了 28.4 和 2.0×10A/W 的高响应率，相应的探测器为 2.3×10 和 1.8×10 琼斯。该器件在 1000 次弯曲循环后仍表现出显著的光电流稳定性。我们的工作表明 Sn 基无铅钙钛矿在高性能和环保型柔性器件中具有巨大的应用前景。
