Ooi Zher Ying, Nie Shenyu, Vega Guadalupe, Lai May Ching, Jiménez-Solano Alberto, Huang Chieh-Szu, Wang Hao, Liu Tianjun, Gałkowski Krzysztof, Nowak Michał P, Nyga Piotr, Cheng Qixiang, Ducati Caterina, Carretero-Palacios Sol, Kahmann Simon, Stranks Samuel D, Anaya Miguel
Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB2 1TN, U.K.
Instituto de Ciencia de Materiales de Sevilla, Universidad de Sevilla-CSIC, Calle Américo Vespucio 49, Sevilla 41092, Spain.
ACS Photonics. 2025 Jul 21;12(8):4119-4129. doi: 10.1021/acsphotonics.4c01942. eCollection 2025 Aug 20.
Narrowband photodetectors with precise spectral control offer significant potential for applications such as color imaging and machine vision. However, existing demonstrations have encountered challenges due to restricted absorption, the need for additional filters, or the inclusion of thick absorbing layers to facilitate charge collection filtering mechanisms. These constraints have resulted in suboptimal detectivity, inadequate color control, or slow response. Here, we exploit cavity resonance enhancement to demonstrate a highly spectral selective and robust perovskite photodetector, showing 2.4-fold EQE enhancement at the main narrowband peak with respect to a broadband photodetector counterpart of the same perovskite thickness. This device architecture achieves peak external quantum efficiency of 80%, responsivity of 0.41 A W, and detectivity of 3.7 × 10 Jones at the main narrowband peak, with a secondary signal below 450 nm that can be mitigated with advanced photonic crystal as proposed. Additionally, the resonant cavity-enhanced photodetector offers a rapid switching of 0.9 μs and low noise of 0.57 pW Hz. Our demonstration shows precise tuning of the main narrowband photodetection characteristics across a 100 nm spectral range by simply varying the thickness of the perovskite layer, ensuring device efficiency and stability across the wavelength region around 560 to 660 nm, where most perovskite devices suffer from degradation due to halide segregation. This work demonstrates the practical integration of resonant cavity enhancement in perovskite photodetectors and paves the way for high-performance optical sensing, multispectral imaging, and wavelength-selective photonic devices.
具有精确光谱控制的窄带光电探测器在彩色成像和机器视觉等应用中具有巨大潜力。然而，现有的演示由于吸收受限、需要额外的滤波器或包含厚吸收层以促进电荷收集滤波机制而遇到了挑战。这些限制导致了次优的探测率、颜色控制不足或响应缓慢。在此，我们利用腔共振增强来展示一种高光谱选择性且稳健的钙钛矿光电探测器，相对于相同钙钛矿厚度的宽带光电探测器对应物，在主要窄带峰值处的外量子效率提高了2.4倍。这种器件架构在主要窄带峰值处实现了80%的峰值外量子效率、0.41 A/W的响应度和3.7×10琼斯的探测率，在450 nm以下有一个次要信号，如所提议的那样，可以用先进的光子晶体来减轻。此外，共振腔增强型光电探测器提供0.9 μs的快速开关和0.57 pW/Hz的低噪声。我们的演示表明，通过简单地改变钙钛矿层的厚度，可以在100 nm光谱范围内精确调谐主要窄带光电探测特性，确保在560至660 nm波长区域内器件的效率和稳定性，在该区域大多数钙钛矿器件由于卤化物偏析而会退化。这项工作展示了共振腔增强在钙钛矿光电探测器中的实际集成，并为高性能光学传感、多光谱成像和波长选择性光子器件铺平了道路。
