Spatial Electrode Modulation Strategy for the Perovskite Single Crystal Photodetector,ACS Photonics

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Spatial Electrode Modulation Strategy for the Perovskite Single Crystal Photodetector
ACS Photonics ( IF 6.5 ) Pub Date : 2024-08-22 , DOI: 10.1021/acsphotonics.4c01087
Yazhou Yang _{1,

2} , Yuankai Song ₃ , Jiayi Li _{1,

2} , Zhenglan Ye _{1,

2} , Dan Chen _{1,

2} , Qinxing Huang _{1,

2} , Yupeng Zhu _{1,

2} , Congwei Shi ₄ , Xiangquan Liu ₁ , Guangze Zhang _{1,

2} , Tao Men _{1,

2} , Yuhua Zuo _{1,

2} , Jun Zheng _{1,

2} , Lei Zhao _{5,

6} , Chunlan Zhou _{5,

6} , Zhi Liu _{1,

2} , Buwen Cheng _{1,

2}

Affiliation

Perovskite meets the diverse needs of photodetectors (PDs) with excellent material properties and wealth of tuning capabilities. Herein, proposed by the spatial electrode modulation strategy, two kinds of perovskite PDs were designed and fabricated, which can modulate the detection bands and enhance the spectrum response greatly. For the light window electrode perovskite PDs, the asymmetric electric field can enhance the carrier collection efficiency and unravel the trade-off between high response and narrowband of PDs, exhibiting both high spectral selectivity (full width at half-maximum <14 nm) and high external quantum efficiency (EQE) of 78.5% at 570 nm. For the dot electrode structure PDs, broadband detection is achieved, attributing to the local electric field enhancement effect, achieving extra avalanche gain with a high EQE of 300% and faster response time of about 42 μs. Furthermore, we developed a packaging process for perovskite devices that enables their direct use in a humid environment. The proposed spatial electrode modulation strategy introduces a novel design paradigm for perovskite optoelectronic devices, paving the way for broader applications.

中文翻译：

钙钛矿单晶光电探测器的空间电极调制策略

钙钛矿凭借优异的材料性能和丰富的调谐能力满足光电探测器（PD）的多样化需求。本文提出的空间电极调制策略，设计并制备了两种钙钛矿PD，它们可以调制检测波段并大大增强光谱响应。对于光窗电极钙钛矿PD，不对称电场可以提高载流子收集效率，并解决PD的高响应和窄带之间的权衡，表现出高光谱选择性（半峰全宽％3C14 nm）和高光谱选择性（半峰全宽％3C14 nm）。 570 nm 处的外量子效率 (EQE) 为 78.5%。对于点电极结构PD，由于局域电场增强效应，实现了宽带检测，实现了额外的雪崩增益，EQE高达300%，响应时间更快，约为42 μs。此外，我们还开发了钙钛矿器件的封装工艺，使其能够在潮湿环境中直接使用。所提出的空间电极调制策略为钙钛矿光电器件引入了一种新颖的设计范式，为更广泛的应用铺平了道路。

更新日期：2024-08-22

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