Composition Modulation-Mediated Band Alignment Engineering from Type I to Type III in 2D vdW Heterostructures

Composition Modulation-Mediated Band Alignment Engineering from Type I to Type III in 2D vdW Heterostructures

© 2024 Wiley‐VCH GmbH.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - 36(2024), 39 vom: 05. Sept., Seite e2400060
1. Verfasser: Guo, Dingli (VerfasserIn)
Weitere Verfasser: Fu, Qiang, Zhang, Guitao, Cui, Yueying, Liu, Kaiyang, Zhang, Xinlei, Yu, Yali, Zhao, Weiwei, Zheng, Ting, Long, Haoran, Zeng, Peiyu, Han, Xu, Zhou, Jun, Xin, Kaiyao, Gu, Tiancheng, Wang, Wenhui, Zhang, Qi, Hu, Zhenliang, Zhang, Jialin, Chen, Qian, Wei, Zhongming, Zhao, Bei, Lu, Junpeng, Ni, Zhenhua
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2024
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article LEDs alloying engineering band alignment photodetector
Beschreibung
Zusammenfassung:© 2024 Wiley‐VCH GmbH.
Band alignment engineering is crucial for facilitating charge separation and transfer in optoelectronic devices, which ultimately dictates the behavior of Van der Waals heterostructures (vdWH)-based photodetectors and light emitting diode (LEDs). However, the impact of the band offset in vdWHs on important figures of merit in optoelectronic devices has not yet been systematically analyzed. Herein, the regulation of band alignment in WSe2/Bi2Te3- xSex vdWHs (0 ≤ x ≤ 3) is demonstrated through the implementation of chemical vapor deposition (CVD). A combination of experimental and theoretical results proved that the synthesized vdWHs can be gradually tuned from Type I (WSe2/Bi2Te3) to Type III (WSe2/Bi2Se3). As the band alignment changes from Type I to Type III, a remarkable responsivity of 58.12 A W-1 and detectivity of 2.91×1012 Jones (in Type I) decrease in the vdWHs-based photodetector, and the ultrafast photoresponse time is 3.2 µs (in Type III). Additionally, Type III vdWH-based LEDs exhibit the highest luminance and electroluminescence (EL) external quantum efficiencies (EQE) among p-n diodes based on Transition Metal Dichalcogenides (TMDs) at room temperature, which is attributed to band alignment-induced distinct interfacial charge injection. This work serves as a valuable reference for the application and expansion of fundamental band alignment principles in the design and fabrication of future optoelectronic devices
Beschreibung:Date Revised 27.09.2024
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1521-4095
DOI:10.1002/adma.202400060