Multilayered Nanometer Thick Films of n-MoS 2 QD/n-MoS 2 /p-CuO as p–n Heterojunctions for Self-Powered Flexible Photodetectors

作者：Krishan Kumar, Reena Yadav, Sarita Devi, Preetam Singh, Sudhir Husale, Sachin Tyagi, Davinder Kaur · 发表于：ACS Applied Nano Materials · 年份：2023 · DOI：10.1021/acsanm.3c03382 · 被引用次数：15 · 研究领域：2D Materials and Applications、ZnO doping and properties、MXene and MAX Phase Materials

The present study has investigated the photoresponse of n-MoS 2 QDs/n-MoS 2 /p-CuO, a hybrid dimensional nanoscale heterostructure fabricated on a flexible Ag-coated Kapton substrate. The fabricated flexible heterostructure demonstrates a significant response toward ultraviolet (UV) (376 nm) to near-infrared (NIR) (1064 nm) wavelengths, even in the self-powered mode. The type-II heterostructure formed between the n-MoS 2 and p-CuO layers offers the necessary built-in potential for separating and transporting photogenerated electron–hole pairs. The fabricated flexible nanodimensional heterostructure offers responsivities of 28, 54, and 83 μA/W for illuminating radiations in UV, visible, and NIR regions, respectively, in the self-biased mode. The response times [rise time (τ r )/fall time (τ f )] for the fabricated flexible heterostructure were found to be 81.12 ms/83.47 ms, 77.36 ms/85.73 ms, and 75.62 ms/81.92 ms for the illumination of radiations lying in the UV, visible, and NIR wavelength regions, respectively. The obtained photoresponse demonstrates that the fabricated MoS 2 QDs/n-MoS 2 /p-CuO hybrid dimensional flexible heterostructure will be a potential candidate for the futuristic era of flexible and ultrarapid photodetection applications.