Polarimetric Image Sensor and Fermi Level Shifting Induced Multichannel Transition Based on 2D PdPS
Polarimetric Image Sensor and Fermi Level Shifting Induced Multichannel Transition Based on 2D PdPS
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基于 2D PdPS 的偏振图像传感器和费米能级移动引起的多通道跃迁
DOI：
10.1002/adma.202107206
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发表时间：
2021
影响因子：
29.4
通讯作者：
Zhongming Wei
中科院分区：
文献类型：
--
作者：
Xingang Wang;Tao Xiong;Kai Zhao;Ziqi Zhou;Kaiyao Xin;H. Deng;Jun Kang;Juehan Yang;Yueyang Liu;Zhongming Wei
2D材料由于其低结构对称性、优异的光响应性和高空气稳定性，近年来引起了人们的高度兴趣。然而，大多数2D材料只能对特定的光做出响应，这限制了宽光谱光电探测器的发展。适当的带隙和费米能级的调节是实现电子多通道跃迁的基础，是获得宽光谱响应的有效方法。在此，设计并合成了一种贵金属二维材料，磷硫化钯（PdPS）。PdPS的带隙约为2.1eV，并且S空位、间隙Pd和P原子的形成促进费米能级非常接近导带。因此，基于PdPS的光电探测器显示出令人印象深刻的宽光谱响应，从日盲紫外到基于多通道跃迁的近红外。它还表现出优越的上级光电性能，在532 nm处的光响应率（R）为1 × 103 A W−1，探测率（D*）为4 × 1011 Jones。此外，PdPS还具有良好的偏振探测性能，在808 nm波长处的二色性比为1.37。重要的是，它通过主动检测在复杂环境中实现极化成像和隐藏目标检测。
2D materials have been attracting high interest in recent years due to their low structural symmetry, excellent photoresponse, and high air stability. However, most 2D materials can only respond to specific light, which limits the development of wide‐spectrum photodetectors. Proper bandgap and the regulation of Fermi level are the foundations for realizing electronic multichannel transition, which is an effective method to achieve a wide spectral response. Herein, a noble 2D material, palladium phosphide sulfide (PdPS), is designed and synthesized. The bandgap of PdPS is around 2.1 eV and the formation of S vacancies, interstitial Pd and P atoms promote the Fermi level very close to the conduction band. Therefore, the PdPS‐based photodetector shows impressive wide spectral response from solar‐blind ultraviolet to near‐infrared based on the multichannel transition. It also exhibits superior optoelectrical properties with photoresponsivity (R) of 1 × 103 A W−1 and detectivity (D*) of 4 × 1011 Jones at 532 nm. Moreover, PdPS exhibits good performance of polarization detection with dichroic ratio of ≈3.7 at 808 nm. Significantly, it achieves polarimetric imaging and hidden‐target detection in complex environments through active detection.