Sameer Sapra




Sameer Sapra



Professor


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



Group Webpage



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. 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).
  2. Band gap engineering in Cs2(NaxAg1-x)BiCl6 double perovskite nanocrystals, R. S. Lamba, P. Basera, S. Bhattacharya, S. Sapra, J. Phys. Chem. Lett. 10, 5173 (2019).
  3. 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 11, 4074 (2019).
  4. Colloidally Synthesized Defect-Rich MoSe2 Nanosheets for Superior Catalytic Activity, Md. S. Hassan, A. Jana, S. Gahlawat, N. Bhandary, S. Bera, P. P. Ingole, S. Sapra, Bull. Mater. Sci. (2019).





Group

      Group Members


    Post-docs
  • Dr. Atanu Jana
  • Dr. Priya Kush
  • Dr. Susnata Bera
  • Dr. Arkajyoti Chakrabarty
    Ph.D. students
  • Sushma Yadav (M. Sc. IIT Delhi)
  • Mona Mittal (M. Sc. IIT Delhi)
  • Md Samim Hassan (M. Tech. Aligarh)
  • Satya Prakash Rai (M. Sc. Allahabad)
    M.Tech. students
  • Astita Dubey
  • Sowmya Vaddadi
    M.Sc. students