Organohalide perovskites have emerged as promising light-sensing materials because of their superior optoelectronic properties and low-cost processing methods. Recently, perovskite-based photodetectors have successfully been demonstrated as both broadband and narrowband varieties. However, the photodetection bandwidth in perovskite-based photodetectors has so far been limited to the near-infrared regime owing to the relatively wide band gap of hybrid organohalide perovskites. In particular, short-wavelength infrared photodiodes operating beyond 1 μm have not yet been realized with organohalide perovskites. In this study, narrow band gap organic dyes are combined with hybrid perovskites to form composite films as active photoresponsive layers. Tuning the dye loading allows for optimization of the spectral response characteristics and excellent charge-carrier mobilities near 11 cm 2 V -1 s -1 , suggesting that these composites combine the light-absorbing properties or IR dyes with the outstanding charge-extraction characteristics of the perovskite. This study demonstrates the first perovskite photodiodes with deep near-infrared and short-wavelength infrared response that extends as far as 1.6 μm. All devices are solution-processed and exhibit relatively high responsivity, low dark current, and fast response at room temperature, making this approach highly attractive for next-generation light-detection techniques.
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机译：有机卤化物钙钛矿因其优越的光电性能和低成本的加工方法而成为有前途的光敏材料。近来，基于钙钛矿的光电探测器已成功地证明是宽带和窄带两种。然而，由于杂化有机卤化物钙钛矿的相对较宽的带隙，到目前为止，基于钙钛矿的光电探测器的光检测带宽被限制在近红外范围。特别地，还没有用有机卤化物钙钛矿实现工作超过1μm的短波长红外光电二极管。在这项研究中，窄带隙有机染料与钙钛矿杂化材料结合形成复合膜作为活性光敏层。调整染料加载量可以优化光谱响应特性，并在11 cm 2 V -1 s -1附近具有出色的电荷载流子迁移率，这表明这些复合材料结合了吸光性能或IR染料具有出色的电荷吸收特性。钙钛矿。这项研究表明了首款具有深远红外和短波长红外响应的钙钛矿光电二极管，其延伸范围高达1.6μm。所有器件均经过溶液处理，并在室温下具有相对较高的响应度，低暗电流和快速响应，这使得该方法对下一代光检测技术具有极大的吸引力。
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