Enhanced photoresponse of monolayer MoS2 through hybridization with carbon quantum dots as efficient photosensitizer
Enhanced photoresponse of monolayer MoS2 through hybridization with carbon quantum dots as efficient photosensitizer
复制标题
通过与碳量子点杂交增强单层 MoS2 的光响应作为高效光敏剂
DOI：
10.1088/2053-1583/ab1c20
复制
发表时间：
2019-07-01
期刊：
影响因子：
5.5
通讯作者：
Hu, PingAn
中科院分区：
文献类型：
--
作者：
Liu, He;Gao, Feng;Hu, PingAn
二维半导体由于其在下一代光电子器件中的潜在应用而引起了越来越多的关注。化学气相沉积（CVD）法生长的单层MoS_2作为光电探测器受到广泛的研究，但其响应速度慢、光响应率低，阻碍了其实际应用。在这项工作中，0 D碳量子点（CQD）被应用于提高2D二硫化钼作为高效和环境光敏剂的光电探测性能的第一次。在360 nm光照下，混合光电探测器的光响应率和探测率分别为377 A W−1和1.6 × 1013 Jones，分别是原始MoS 2的22倍和7倍。复合光电探测器的光响应增强是由于CQDs和MoS 2层的协同吸收效应和层间激子跃迁引起的。混合光电探测器的响应速度比原始的MoS 2光电探测器快四倍。这些结果为2D-0 D MoS 2-CQDs在高性能光电探测器中的应用奠定了基础。
Two-dimensional (2D) semiconductors have attracted increasing attention due to their potential application in next generation optoelectronic devices. The chemical vapor deposition (CVD) grown monolayer MoS2 is widely investigated as photodetector, but low photoresponsivity and slow response time hinder its practical application. In this work, 0D carbon quantum dots (CQDs) are applied to enhance photodetection performance of 2D MoS2 as efficient and environmental photosensitizer for the first time. The photoresponsivity and detectivity of hybrid photodetector are 377 A W−1 and 1.6 × 1013 Jones under 360 nm illumination, respectively, which are 22 and 7 times higher than pristine MoS2. The enhanced photoresponse of hybrid photodetector arises from synergetic absorption effect and interlayer excitonic transition of CQDs and MoS2 layer. The response speed of hybrid photodetector is four times faster than pristine MoS2 photodetector. Those results pave a way to hybrid 2D–0D MoS2–CQDs application in high performance photodetector.