DataVXAdvanced Optical MaterialsPaper
journal article·2020-01

Unveiling Bandgap Evolution and Carrier Redistribution in Multilayer WSe2: Enhanced Photon Emission via Heat Engineering

Yuanzheng Li, Weizhen Liu, Haiyang Xu, Heyu Chen, Hang Ren, Jia Shi, Wenna Du, Wei Zhang, Qiushi Feng, Jiaxu Yan, Cen Zhang, Yichun Liu, Xinfeng Liu

Advanced Optical Materials· Volume 8· Issue 2
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Source abstract

Abstract

Abstract Manipulating the bandgap structure and carrier distribution of multilayer transition metal dichalcogenides (TMDs) is crucial for improving their fluorescence efficiency and extending their optoelectronic applications. Herein, the evolution of the conduction band minimum of multilayer WSe2 as a function of the temperature and thickness is experimentally demonstrated and an ≈70‐fold fluorescence enhancement of the K–K direct emission is observed at 560 K in multilayer WSe2 flakes (≈170 nm) by heat engineering. This abnormal enhancement is attributed to thermally driven carrier redistribution achieved via intervalley transfer, which is confirmed by the theoretical calculations and temperature‐dependent time‐resolved photoluminescence. In addition, a threshold temperature of the intervalley transfer is proposed to describe the on‐state of the carrier redistribution model. The corresponding threshold temperature is determined to be ≈580 K, which is consistent with the temperature at which the maximum photoluminescence enhancement is observed. The study provides a useful strategy to optimize the optical and electric performances of multilayer WSe2 and other TMDs materials.
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Research context

Electronic materials

OpenAlex topics: 2D Materials and Applications · MXene and MAX Phase Materials · Perovskite Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory of UV‐Emitting Materials and Technology (Northeast Normal University) Ministry of Education Changchun 130024 China

CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 China

Key Laboratory of Semiconductor Materials Science Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China

Funding

Ministry of Science and Technology of the People's Republic of China · National Natural Science Foundation of China · Natural Science Foundation of Beijing Municipality · State Key Laboratory of Low-Dimensional Quantum Physics · Higher Education Discipline Innovation Project · People's Government of Jilin Province · Fundamental Research Funds for the Central Universities

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