Filterless narrowband photodetectors enabled by controllable band modulation through ion migration: The case of halide perovskites

IF 22.7 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Infomat Pub Date : 2023-12-12 DOI:10.1002/inf2.12506
Yu Li, Shanshan Yu, Junjie Yang, Kai Zhang, Mingyu Hu, Weitao Qiu, Fumin Guo, Wei Qian, Sean Reinecke, Tao Chen, Makhsud I. Saidaminov, Jian Wang, Shihe Yang
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Abstract

Narrowband photodetectors conventionally rely on optical structure design or bandpass filters to achieve the narrowband regime. Recently, a strategy for filterless narrowband photoresponse based on the charge collection narrowing (CCN) mechanism was reported. However, the CCN strategy requires an electrically and optically “thick” photoactive layer, which poses challenges in controlling the narrowband photoresponse. Here we propose a novel strategy for constructing narrowband photodetectors by leveraging the inherent ion migration in perovskites, which we term “band modulation narrowing” (BMN). By manipulating the ion migration with external stimuli such as illumination, temperature, and bias voltage, we can regulate in situ the energy-band structure of perovskite photodetectors (PPDs) and hence their spectral response. Combining the Fermi energy levels obtained by the Kelvin probe force microscopy, the internal potential profiles from solar cell capacitance simulator simulation, and the anion accumulation revealed by the transient ion-drift technique, we discover two critical mechanisms behind our BMN strategy: the extension of an optically active but electronically dead region proximal to the top electrode and the down-bending energy bands near the electron transport layer. Our findings offer a case for harnessing the often-annoying ion migration for developing advanced narrowband PPDs.

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通过离子迁移实现可控波段调制的无滤光片窄带光电探测器:卤化物过氧化物
窄带光电探测器通常依靠光学结构设计或带通滤波器来实现窄带系统。最近,一种基于电荷收集收窄(CCN)机制的无滤波器窄带光响应策略被报道出来。然而,CCN 策略需要电学和光学 "厚 "光活性层,这给控制窄带光响应带来了挑战。在这里,我们提出了一种利用包晶石中固有的离子迁移来构建窄带光电探测器的新策略,我们称之为 "带调制收窄"(BMN)。通过在光照、温度和偏置电压等外部刺激下操纵离子迁移,我们可以就地调节包晶体光电探测器(PPD)的能带结构,进而调节其光谱响应。结合开尔文探针力显微镜获得的费米能级、太阳能电池电容模拟器模拟获得的内部电位曲线,以及瞬态离子漂移技术揭示的阴离子积累,我们发现了 BMN 策略背后的两个关键机制:光学活跃但电子死区靠近顶部电极的延伸,以及电子传输层附近能带的下弯。我们的研究结果为利用经常令人烦恼的离子迁移来开发先进的窄带聚光二极体提供了一个案例。
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来源期刊
Infomat
Infomat MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
37.70
自引率
3.10%
发文量
111
审稿时长
8 weeks
期刊介绍: InfoMat, an interdisciplinary and open-access journal, caters to the growing scientific interest in novel materials with unique electrical, optical, and magnetic properties, focusing on their applications in the rapid advancement of information technology. The journal serves as a high-quality platform for researchers across diverse scientific areas to share their findings, critical opinions, and foster collaboration between the materials science and information technology communities.
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