Wang Bin, Zou Yuting, Lu Huanyu, Kong Wenchi, Singh Subhash C, Zhao Chen, Yao Chaonan, Xing Jun, Zheng Xin, Yu Zhi, Tong Cunzhu, Xin Wei, Yu Weili, Zhao Bo, Guo Chunlei
The Guo Photonics Laboratory, State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, 130033, P. R. China.
University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Small. 2020 Jun;16(24):e2001417. doi: 10.1002/smll.202001417. Epub 2020 May 14.
Triple-cation mixed metal halide perovskites are important optoelectronic materials due to their high photon to electron conversion efficiency, low exciton binding energy, and good thermal stability. However, the perovskites have low photon to electron conversion efficiency in near-infrared (NIR) due to their weak intrinsic absorption at longer wavelength, especially near the band edge and over the bandgap wavelength. A plasmonic functionalized perovskite photodetector (PD) is designed and fabricated in this study, in which the perovskite ((Cs FA MA )Pb(I Br ) ) active materials are spin-coated on the surface of Au bowtie nanoantenna (BNA) arrays substrate. Under 785 nm laser illumination, near the bandedge of perovskite, the fabricated BNA-based plasmonic PD exhibits ≈2962% enhancement in the photoresponse over the Si/SiO -based normal PD. Moreover, the detectivity of the plasmonic PD has a value of 1.5 × 10 with external quantum efficiency as high as 188.8%, more than 30 times over the normal PD. The strong boosting in the plasmonic PD performance is attributed to the enhanced electric field around BNA arrays through the coupling of localized surface plasmon resonance. The demonstrated BNA-perovskite design can also be used to enhance performance of other optoelectronic devices, and the concept can be extended to other spectral regions with different active materials.
三阳离子混合金属卤化物钙钛矿因其高的光子到电子转换效率、低的激子结合能和良好的热稳定性而成为重要的光电器件材料。然而，由于钙钛矿在较长波长下，特别是在带边附近和带隙波长以上的固有吸收较弱，其在近红外（NIR）区域的光子到电子转换效率较低。本研究设计并制备了一种等离子体功能化钙钛矿光电探测器（PD），其中钙钛矿（（CsFA MA）Pb（I Br））活性材料旋涂在金蝴蝶结纳米天线（BNA）阵列基底表面。在785 nm激光照射下，在钙钛矿带边附近，制备的基于BNA的等离子体PD的光响应比基于Si/SiO的普通PD提高了约2962%。此外，等离子体PD的探测率为1.5×10，外量子效率高达188.8%，是普通PD的30多倍。等离子体PD性能的显著提升归因于通过局域表面等离子体共振耦合在BNA阵列周围增强的电场。所展示的BNA-钙钛矿设计也可用于提高其他光电器件的性能，并且该概念可以扩展到使用不同活性材料的其他光谱区域。
