Journal
NANO RESEARCH
Volume 14, Issue 11, Pages 4274-4280Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-021-3667-6
Keywords
WS2; photoluminescence; laser irradiation; physisorption; chemisorption
Categories
Funding
- Program of National Natural Science Foundation of China [51732003, 51872043, 61604037, 11874104, 12074060, 12004069]
- National Science Fund for Distinguished Young Scholars [52025022]
- 111 Project [B13013]
- National Key Research and Development Program of China [2016YFA0201902, 2019YFB2205100]
- Ministry of Education [6141A02033414]
- Shenzhen Nanshan District Pilotage Team Program [LHTD20170006]
- China Postdoctoral Science Foundation [2020M681025, 2021T140109, 2021M693905]
- Fundamental Research Funds for the Central Universities [2412020QD015, 2412019BJ006, 2412021ZD007, 2412021ZD012, 2412019FZ034]
- Postdoctoral Science Foundation funded project from Jilin Province [111865005]
- Fund from Jilin Province [YDZJ202101ZYTS049, YDZJ202101ZYTS041, YDZJ202101ZYTS133, JJKH20211273KJ, JJKH20211274KJ, 20190103007JH]
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Efficient photoluminescence enhancement in monolayer WS2 induced by laser irradiation is achieved by a synergistic effect of physisorption and chemisorption, where physisorption dominates with more than 74% contribution. Understanding the adsorption mechanism in laser-irradiated TMDs may lead to potential applications in patterned light source, effective photosensor, and ultrathin optical memory.
To further improve the quantum efficiency of atomically thin transition metal dichalcogenides (TMDs) is crucial for the realization of high-performance optoelectronic applications. To this regard, a few chemical or physical approaches such as superacid treatment, electrical gating, dielectric screening, and laser irradiation have been developed. In particular, the laser irradiation appears to be a more efficient way with good processability and spatial selectivity. However, the underlying mechanism especially about whether chemisorption or physisorption plays a more important role is still debatable. Here, we unravel the mystery of laser irradiation induced photoluminescence enhancement in monolayer WS2 by precisely controlling irradiation time and environment. It is found that the synergetic effect of physisorption and chemisorption is responsible for the photoluminescence enhancement, where the physisorption dominates with more than 74% contribution. The comprehensive understanding of the adsorption mechanism in laser-irradiated TMDs may trigger the potential applications for patterned light source, effective photosensor and ultrathin optical memory.
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