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2D Lead Dihalides for High‐Performance Ultraviolet Photodetectors and their Detection Mechanism Investigation
Small ( IF 13.3 ) Pub Date : 2017-11-06 , DOI: 10.1002/smll.201702024
Manlin Tan 1, 2 , Chao Hu 1 , Yang Lan 1 , Jahangeer Khan 1 , Hui Deng 1 , Xiaokun Yang 1 , Peixiang Wang 1 , Xiangxiang Yu 1 , Jianjun Lai 1 , Haisheng Song 1
Affiliation  

2D halide semiconductors, a new family of 2D materials in addition to transition metal dichalcogenides, present ultralow dark current and high light conversion yield, which hold great potential in photoconductive detectors. Herein, a facile aqueous solution method is developed for the preparation of large‐scale 2D lead dihalide nanosheets (PbF2‐xIx). High‐performance UV photodetectors are successfully implemented based on 2D PbF2‐xIx nanosheets. By modulating the components of halogens, the bandgap of PbF2‐xIx nanosheets can be tuned to meet varied detection spectra. The photoresponse dependence on incident power density, wavelength, detection environment, and temperature are systematically studied to investigate their detection mechanism. For PbI2 photodetectors, they are dominantly driven by a photoconduction mechanism and show a fast response speed and a low noise current density. A high normalized detectivity of 1.5 × 1012 Jones and an ION/IOFF ratio up to 103 are reached. On the other hand, PbFI photodetectors demonstrate a photogating mechanism mediated by trap states showing high responsivity. The novel 2D halide materials with wide bandgaps, superior detection performance, and facile synthesis process can enrich the Van der Waals solids family and hold great potential for a wide variety of applications in advanced optoelectronics.

中文翻译:

高性能紫外光电检测器的二维二卤化铅及其检测机理的研究

2D卤化物半导体是过渡金属二卤化物以外的2D新材料系列,具有超低的暗电流和高的光转换率,在光电导检测器中具有巨大的潜力。本文中,开发了一种用于制备大规模二维二维二卤化铅纳米片(PbF 2- x I x)的简便水溶液方法。高性能UV光电探测器已成功基于2D PbF 2 x 1 x纳米片实现。通过调节卤素的成分,PbF 2- x I x的带隙可以调整纳米片以满足不同的检测光谱。系统研究了光响应对入射功率密度,波长,检测环境和温度的依赖性,以研究其检测机理。对于PbI 2光电探测器,它们主要由光电导机制驱动,并显示出快速的响应速度和低的噪声电流密度。1.5×10 12 Jones的高归一化检测率和高达10 3I ON / I OFF达到。另一方面,PbFI光电探测器展示了由具有高响应性的陷阱态介导的光闸机制。具有宽禁带,优异的检测性能和便捷的合成过程的新型2D卤化物材料可以丰富Van der Waals固体族,并在先进的光电技术中具有广泛的应用潜力。
更新日期:2017-11-06
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