Journal
APPLIED PHYSICS LETTERS
Volume 119, Issue 5, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0060587
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Funding
- National Natural Science Foundation of China [51732003, 51872043, 61604037, 11874104, 12074060, 12004069, 12074086]
- National Science Fund for Distinguished Young Scholars [52025022]
- National Key Research and Development Program of China [2019YFB2205100]
- Ministry of Education [6141A02033414]
- China Postdoctoral Science Foundation [2020M681025, 2021M693905, 2021T140109]
- Fundamental Research Funds for the Central Universities [2412020QD015, 2412019BJ006, 2412021ZD007, 2412021ZD012]
- Jilin Province [111865005, YDZJ202101ZYTS049, YDZJ202101ZYTS041, YDZJ202101ZYTS133, JJKH20211273KJ, JJKH20211274KJ]
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The study reveals that in monolayer WS2, band edge A-excitons can effectively generate high-energy C-excitons through a many-body process, and the relaxation of hot carriers from C-excitons to band edge states can compensate for and slow the decay of A-excitons. This comprehensive understanding of the interrelation between C-exciton and A-exciton dynamics in monolayer TMDs may lead to potential applications for future TMD-based light-harvesting devices.
Two-dimensional transition metal dichalcogenides (TMDs) are emerging as a promising complement for traditional semiconductor materials in ultrathin optoelectronic device fields. Developing a better understanding of high-energy C-exciton dynamics is essential for efficiently extracting hot carriers and building high-performance TMD-based light-harnessing devices; however, insight into the C-exciton dynamics remains scarce. To further understand the C-exciton dynamics, here, we have unraveled the interrelation between C-exciton and band edge A-exciton dynamics in monolayer WS2 by transient absorption spectroscopy. It is found that the band edge A-excitons could effectively generate high-energy C-excitons via the many-body process, and, in turn, the hot carriers relaxing from C-excitons to band edge states could compensate and slow the decay of the A-excitons. The comprehensive understanding of the interrelation between C-exciton and A-exciton dynamics in monolayer TMDs may trigger the potential applications for future TMD-based light-harvesting devices.
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