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( Ganesh Ghimire ),( Yongjun Lee ),( Seokjoon Yun ),서창원,( Hyun Kim ),( Roy Aad ),( Young Hee Lee ),김정용 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Monolayer transition metal dichalcogenide (1L-TMDs) provides a convenient platform to design light emission from 2 dimensionally confined excitonic systems. Many body effects arising from strong interactions among carriers have been of considerable interest in nanoscience. The exciton-exciton annihilation (EEA) process reduces the generated excitons density and affects the performances of the opto-electronic devices. We studied multiexciton dynamics in chemically treated TMDs like MoS<sub>2</sub>, WS<sub>2</sub> and WSe<sub>2</sub> using non-linear photoluminescence (PL) spectroscopy. We also studied the many body correlations between excitons in pristine and chemically treated 1L-TMDs by excitation power dependence of PL and time resolved PL spectroscopy. We observed the decrease of the EEA rate after the chemical treatment.