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ELOS 2022

The dynamic and evolving world of Quantum Dots

Karan Surana, Speaker at Optics Conferences
Sardar Patel University, India
Title : The dynamic and evolving world of Quantum Dots

Abstract:

A quantum dot (QD) is a semiconductor nanostructure that confines the motion of conduction band electrons, valence band holes, or excitons (bound pairs of conduction band electrons and valence band holes) in all three spatial directions. The quantum confinement results in appearance of discrete energy levels leading to existence of multiple exciton generation (MEG), tunable band gap and size dependent photoluminescence in quantum dots (QDs). These semiconducting marvels have been prepared by a variety of material combinations, such as, group II and group VI, group III and group V, and most recently from carbon. We have been able to synthesize a variety of QD such as CdSe, CdS, CdSe-CdS, and Carbon and successfully tested their applications in third generation solar cells. By using only CdSe QD on the photo anode, we have been able to achieve a maximum Voc of 1.51 V. In another study, upon using sequential deposition of different QD we were able to achieve eight times higher efficiency than its corresponding dye sensitized solar cell (DSSC). Furthermore, the use of C QD in co-sensitized type device resulted in almost three times increase in efficiency than the DSSC. Overall, QD can serve a much wider purpose in establishing better useful devices for everyday applications. Quite recently, we have started working on using the QD to develop in-door photovoltaic based systems.

 

Biography:

Dr. Karan Surana had completed his Ph.D from Sharda University, Greater Noida, India in the field of ‘quantum dot solar cells’, prior to which he obtained his Master’s degree in Nanoscience and Technology. In his 8 years of research work he has gained expertise in synthesis and characterization of quantum dots and carbon materials, and in fabricating solar cells, supercapacitors, and batteries. He has published 19 research papers in international peer reviewed journals, 5 papers in conference proceedings and one book chapter. He is currently working as a UGC-DS Kothari Post-doc fellow at Department of Chemistry, Sardar Patel University, Gujarat.

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