期刊
ADVANCED OPTICAL MATERIALS
卷 11, 期 1, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202201897
关键词
defects; high linear dynamic range; intensity-dependent photocurrent dynamics; low dark current; PbS quantum dots; photodetectors
Solution-processed lead sulfide quantum dots (PbS QDs) are an excellent candidate for photodetector applications due to their broadband absorption, tuneable bandgaps, high stability, and flexibility. This study investigates the effect of traps on the performance of PbS QD photodetectors fabricated using different ligands. The results indicate that lead halide ligands yield the best devices with low dark current density and high detectivity.
Solution-processed lead sulfide quantum dots (PbS QDs) are an excellent candidate for photodetector applications because they exhibit broadband absorption, a wide range of tuneable bandgaps, high stability in air, and mechanical flexibility. However, a crucial criterion for the fabrication of high-performance photodetectors is the selection of the ligands, which can facilitate charge carrier transport between the PbS QDs and passivate the surface defects. In this work, the authors have studied the effect of traps on the performance of PbS QD photodetectors that are fabricated using different types of ligands, using intensity-dependent photoresponse dynamics. The best devices with lead halide ligands show a dark current density of 5 x 10(-9) A cm(-2) at -0.2 V, which is one of the lowest values reported thus far for solution-processed PbS QD-based photodetectors. Moreover, these devices show a high linear dynamic range (approximate to 90 dB) and high detectivity (>10(13) Jones), in addition to an f(-3 dB) of greater than 100 kHz without the application of an external voltage bias at a wavelength of 784 nm. These results suggest that with an appropriate selection of ligands, solution-processed photodetectors with a lower density of traps and a better device performance can be fabricated.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据