Professor IACS, 1971- continuing,
Ex-Director IACS
Project Director, MNES/DST project on a-Si Solar cell.

Pioneered work in the area of development of a-Si thin film solar cell technology which has earned National and International recognition.
Served as General Chairman of the Sixth International Photovoltaic Science and Engineering Conference, Member of International Advisory Committee of several conferences.

Published more than 250 original scientific papers and 36 students have been awarded Ph.D. degree.
Served as President of the Indian Physical Society

Award/ Honors etc. :

1. Padmashri 

2.  Fellow of the Indian Academy of Science, Bangalore.
3.  Fellow of West Bengal Academy of Science and Technology.
3. Awarded the Medal Lecture and Materials Science Prize of the Materials Research Society of India

Current research Interests :

Materials and fabrication technology for multijunction a-Si solar cells/ modules and its commercialization.