Ultrafast Charge Carrier and Polaron Dynamics in 2D-Transition Metal Chalcogenides

Research on two-dimensional (2D) transition metal dichalcogenides (TMDC) have gained incredible interest and importance in recent times, attributable to their fascinating optical, electronic and mechanical properties. They offer both fundamental and technological implications in various advanced electronic, optoelectronic and gas sensing devices, energy storage systems, photovoltaics and photo-catalysis. To optimize the efficiency of any devices it is very important to understand the ultrafast charge carrier dynamics of these 2D TMDC materials. In the present talk we will discuss photo-excited charge carrier dynamics of few TMDC materials with the aid of Femto-second broad-band pump-probe spectroscopy and Femtosecond Terahertz spectroscopy. We have discussed free-carriers, exciton and other quasi particles like bi-exciton and trion dynamics in TMDC on excitation with ultrafast laser pulse.<br/><b>References: </b><br/>1. T. Goswami, R. Rani, K. S. Hazra, and H. N. Ghosh, J. Phys. Chem. Lett, <b>2019</b>, 10, 3057-3063.<br/>2. T. Goswami, D. K. Yadav, H. Bhatt, G. Kaur, A. Shukla, K. J. Babu, H. N. Ghosh<br/><i>J. Phys. Chem. Lett</i>, <b>2021, </b><i>12</i>, 5000−5008.<br/>3. T. Goswami, H. Bhatt, K. J. Babu, G. Kaur, N.Ghorai, H. N. Ghosh<br/><i>J. Phys. Chem.</i><i> Lett.</i> <b>2021, </b><i>12</i>, 6526−6534.<br/>4. H. Bhatt, T. Goswami, D.K. Yadav, N. Ghorai, A. Shukla, A. Kaur, H. N. Ghosh<br/><i>J. Phys. Chem. Letters</i> <b>2021, </b><i>12, 11865−11872. </i><br/>5. T. Goswami, H. Bhatt, D. K. Yadav, H.N. Ghosh<br/><i>J. Phys. Chem. B</i>, <b>2022</b>, <i>126</i>, 572–580.<br/>6. T. Goswami, H. Bhatt, D.K. Yadav, R. Saha, K. J. Babu, H. N. Ghosh<br/><i>J. Chem. Phys. </i><b>2022, </b>1<i>56</i>, 034704.<br/>7. T. Goswami, H. Bhatt, D.K. Yadav, H. N. Ghosh<br/><b><i>Phys. Chem. Chem. Phys.</i></b> <i>(Perspective)</i> <b>2022,</b> <b><i>24</i></b><b><i>,</i></b> 19121-19143.