Faculty

Born: Oct 1974, New Delhi
Ph.D. (Prof. D. D. Sarma), IISc Bangalore, 2004
Post Doctoral Fellow: LMU Munich, Prof. Andrey Rogach, May 05 - Apr 06
Post Doctoral Fellow: TU Dresden, Prof. Dr. Alexander Eychmueller, May 06 - Jan 08
Assistant Professor: Indian Institute of Technology Bombay, Jan 08-Jun 08
Assistant Professor: Indian Institute of Technology Delhi, Jul 08-Dec 12
Associate Professor: Indian Institute of Technology Delhi, Dec 12-Aug 18
Professor: Indian Institute of Technology Delhi, Aug 18-present

Research Interests

Our research focuses on the synthesis and applications of nanocrystals: in particular semiconductor nanocrystals or quantum dots. The interest in nanocrystals stems from the fact that these tiny fragments of matter exhibit properties dependent on the size of the crystals. Semiconductors offer the possibility of obtaining fluorescence owing to excitation decay across the band gap. The band gap of a semiconductor, and therefore the energy of emission, can be tuned by changing the size of the nanocrystals in accordance with the quantum confinement effects. Our group concentrates mainly on the group II-VI chalcogenides, namely that of cadmium and zinc for the visible region of the electromagnetic spectrum, group IV-VI semiconductors such as PbS and PbSe for the infra-red region. Also, we are actively engaged in designing new materials with the possibility of charge separation across interfaces. These materials are highly desirable for applications such as photocatalysis, photovoltaics and photoconductivity.

Selected Publications

1. Impact of Bifunctional Ligands on Charge Transfer Kinetics in CsPbBr₃–CdSe/CdS/ZnS Nanohybrids, S Khurana, MS Hassan, P Yadav, D Ghosh, S Sapra, The Journal of Physical Chemistry Letters, 2022, 13 (11), 2591-2599
2. MoSe₂/SnS Nanoheterostructures for Water Splitting, A Singh, J Rohilla, MS Hassan, PP Ingole, PK Santra, D Ghosh, S Sapra, ACS Applied Nano Materials, 2022, 5 (3), 4293-4304
3. Insight into morphology dependent charge carrier dynamics in ZnSe–CdS nanoheterostructures, M Mittal, J Dana, F Lübkemann, HN Ghosh, NC Bigall, S Sapra Physical Chemistry Chemical Physics, 2022, 24 (14), 8519-8528
4. Lead-Free Alloyed Double-Perovskite Nanocrystals of Cs₂(Na_xAg_1–x)BiBr₆ with Tunable Band Gap, RS Lamba, P Basera, S Singh, S Bhattacharya, S Sapra, The Journal of Physical Chemistry C, 2021, 125 (3), 1954-1962
5. Precursor-Mediated Synthesis of Shape-controlled Colloidal CsPbBr3 Perovskite Nanocrystals and their Nanofiber-Directed Self-assembly, A. Chakrabarty, S. Satija, U. Gangwar, S. Sapra, Chem. Mater., 2020.
6. Band gap engineering in Cs2(NaxAg1-x)BiCl6 double perovskite nanocrystals, R. S. Lamba, P. Basera, S. Bhattacharya, S. Sapra, J. Phys. Chem. Lett., 2019, 10, 5173
7. MoSe2-Cu2S Vertical p-n Nanoheterostructures for High-Performance Photodetector, Md. S. Hassan, S. Bera, D. Gupta, S. K. Ray, S. Sapra, ACS Appl. Mater. Interfaces, 2019,  11, 4074.