双机制 WS2-WSe2 横向单层异质结光电探测器及其与 CsPbBr3 量子点杂交增强光响应,Advanced Optical Materials

当前位置： X-MOL 学术 › Adv. Opt. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

双机制 WS2-WSe2 横向单层异质结光电探测器及其与 CsPbBr3 量子点杂交增强光响应
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2023-06-23 , DOI: 10.1002/adom.202300751
Shuang Qiao _{1,

2} , Jihong Liu ₂ , Ruining Wang ₂ , Linjuan Guo ₂ , Shufang Wang ₂ , Anlian Pan ₃ , Caofeng Pan ₁

Affiliation

具有高界面质量和明确结构的单层二维横向异质结构在新型电子和光电应用中特别有前途。然而，光电响应仍然很低，其工作和调节机制亟待探索。在此，成功制备了具有原子级尖锐界面和II型结构能带排列的WS ₂ -WSe ₂横向单层异质结。有趣的是，这种异质结光电探测器（PD）在光伏和光电导模式下均实现了出色的光电流生成特性，响应度（R s）为60.2/3.0 AW ^-1，探测度（D* s）为1.81/0.98 × 10 ¹² Jones，并且响应时间分别为 32.2/28.5 和 39.5/32.1 毫秒。此外，引入全无机CsPbBr _{3量子点以显着促进光电响应。}由于CsPbBr ₃良好的能带排列和大吸收以及高效的载流子传输，R s 和D* s 分别大幅提高至1307/141.3 AW ^-1和1.16/2.94 × 10 ¹³ Jones，具有出色的外部量子效率为 3.59/0.388 × 10 ⁵ %，响应时间也缩短为 12.5/13.2 和 17.4/15.8 ms。此外，环境稳定性也显着增强。这项研究表明，二维横向异质结与全无机钙钛矿的结合可能为开发高性能PD带来有希望的机会。

"点击查看英文标题和摘要"

Dual Mechanism WS2-WSe2 Lateral Monolayer Heterojunction Photodetector and Its Photoresponse Enhancement by Hybridizing with CsPbBr3 QDs

Monolayer 2D lateral heterostructures with high interface qualities and well-defined structures are particularly promising in novel electronic and optoelectronic applications. However, the photoelectric responses are still very low, and the working and modulating mechanisms urgently need exploration. Here, a lateral monolayer heterojunction of WS₂-WSe₂ is successfully prepared with an atomically sharp interface and a band alignment of type-II structure. Intriguingly, this heterojunction photodetector (PD) achieves outstanding characteristics of photocurrent generation in both photovoltaic and photoconductive modes with responsivities (Rs) of 60.2/3.0 A W⁻¹, detectivities (D*s) of 1.81/0.98 × 10¹² Jones, and response times of 32.2/28.5 and 39.5/32.1 ms, respectively. Moreover, all-inorganic CsPbBr₃ quantum dots are introduced to substantially promote the photoelectric responses. Because of the favorable band alignment and large absorption of the CsPbBr₃, and efficient carrier transfer, the Rs and D*s are substantially improved to 1307/141.3 A W⁻¹ and 1.16/2.94 × 10¹³ Jones, respectively, with fantastic external quantum efficiencies of 3.59/0.388 × 10⁵% and also shortened response times of 12.5/13.2 and 17.4/15.8 ms. In addition, the ambient stability is remarkably enhanced. This study demonstrates that the combination of 2D lateral heterojunction with all-inorganic perovskite may bring up promising opportunities for developing high-performance PDs.

更新日期：2023-06-23

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南