Enhanced interlayer neutral excitons and trions in trilayer van der Waals heterostructures

Chanyeol Choi, Jiahui Huang, Hung Chieh Cheng, Hyunseok Kim, Abhinav Kumar Vinod, Sang Hoon Bae, V. Ongun Özçelik, Roberto Grassi, Jongjae Chae, Shu Wei Huang, Xiangfeng Duan, Kristen Kaasbjerg, Tony Low, Chee Wei Wong

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Vertically stacked van der Waals heterostructures constitute a promising platform for providing tailored band alignment with enhanced excitonic systems. Here, we report observations of neutral and charged interlayer excitons in trilayer WSe2–MoSe2–WSe2 van der Waals heterostructures and their dynamics. The addition of a WSe2 layer in the trilayer leads to significantly higher photoluminescence quantum yields and tunable spectral resonance compared to its bilayer heterostructures at cryogenic temperatures. The observed enhancement in the photoluminescence quantum yield is due to significantly larger electron–hole overlap and higher light absorbance in the trilayer heterostructure, supported via first-principles pseudopotential calculations based on spin-polarized density functional theory. We further uncover the temperature- and power-dependence, as well as time-resolved photoluminescence of the trilayer heterostructure interlayer neutral excitons and trions. Our study elucidates the prospects of manipulating light emission from interlayer excitons and designing atomic heterostructures from first-principles for optoelectronics.

Original languageEnglish (US)
Article number30
Journalnpj 2D Materials and Applications
Volume2
Issue number1
DOIs
StatePublished - Dec 1 2018

Bibliographical note

Funding Information:
The authors are grateful for helpful discussions with Philip Kim, Tony van Buuren, Jinkang Lim, Zhangji Zhao, Jin Ho Kang, Baicheng Yao, and Yandong Luo. We acknowledge support from the University of California—National Laboratory Research Program and the National Science Foundation (DMR-1611598).

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