材料科学
光电探测器
等离子体子
光电子学
钙钛矿(结构)
氮化物
钛
氮化钛
光学
纳米技术
物理
图层(电子)
化学工程
工程类
冶金
作者
Z. Liu,Yuying Xi,Wenbo Zeng,Ting Ji,Wenyan Wang,Shu Guo,Lei Shi,Rong Wen,Yanxia Cui,Guohui Li
出处
期刊:Photonics Research
[The Optical Society]
日期:2024-03-01
卷期号:12 (3): 522-522
摘要
Lead-free perovskite Cs 2 AgBiBr 6 manifests great potential in developing high-performance, environmentally friendly, solution-processable photodetectors (PDs). However, due to the relatively large energy bandgap, the spectrum responses of Cs 2 AgBiBr 6 PDs are limited to the ultraviolet and visible region with wavelengths shorter than 560 nm. In this work, a broadband Cs 2 AgBiBr 6 PD covering the ultraviolet, visible, and near infrared (NIR) range is demonstrated by incorporating titanium nitride (TiN) nanoparticles that are prepared with the assistance of self-assembled polystyrene sphere array. In addition, an atomically thick Al 2 O 3 layer is introduced at the interface between the Cs 2 AgBiBr 6 film and TiN nanoparticles to alleviate the dark current deterioration caused by nanoparticle incorporation. As a result, beyond the spectrum range where Cs 2 AgBiBr 6 absorbs light, the external quantum efficiency (EQE) of the TiN nanoparticle incorporated Cs 2 AgBiBr 6 PD is enhanced significantly compared with that of the control, displaying enhancement factors as high as 2000 over a broadband NIR wavelength range. The demonstrated enhancement in EQE arises from the photocurrent contribution of plasmonic hot holes injected from TiN nanoparticles into Cs 2 AgBiBr 6 . This work promotes the development of broadband solution-processable perovskite PDs, providing a promising strategy for realizing photodetection in the NIR region.
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