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Raghu N. Bhattacharya

Senior Scientist

Photo of Raghu Battacharya
Phone: 
(303) 384-6477
At NREL Since: 
1990

Dr. Raghu Bhattacharya is a Senior Scientist in the Chemical and Materials Science Center. Dr. Bhattacharya and colleagues have pioneered a unique processing approach using electrodeposition to prepare superconducting oxide films and buffer layers. Electrodeposition is a high-rate, cost-effective thick-film tape process. His team obtained a critical current density of 1.8 MA/cm2 at 75.2 K in 600 Gauss magnetic field for a YBCO superconductor using a nonvacuum electrodeposited buffer layer. This is a world-record critical current density (a measure of how much current a wire can carry divided by its cross-sectional area). This tape has the potential to offer lower cost and superior performance to alternative methods that are under development.

Dr. Bhattacharya also works in the area of thin-film photovoltaics, focusing on the semiconductor based on copper indium gallium diselenide (CIGS). In collaboration with National Center for Photovotaics team members, he has fabricated a world-record (18.5%-efficient) thin-film solar cell using a unique ZnS(0,OH)/CIGS device structure with a single-layer, chemical-bath-deposited ZnS/(O,OH) buffer layer.

Accomplishments

  • 139+ publications
  • 21 patents
  • Author of a book chapter

Education 

  • 1978–1982 Ph.D. in Semiconductor Thin Films at IIT Kharagpur, India

  • 1978–1982 C.S.I.R. Fellowship

  • 1976–1978 National Scholarship

  • 1978 1st class 1st, M.S.

  • 1976 1st class 1st, B.S.

Selected Publications 

  1. R.N. Bhattacharya, "Electrodeposition Process for Forming Superconducting Ceramics," U.S. Patent No. 5,550,104 (27 August 1996).
  2. R.N. Bhattacharya, W. Batchelor, H. Wiesner, K. Ramanathan, and R.N. Noufi, "Preparation of CuxInyGazSen (x=0-2, y=0-2, z=0-2, n= 0-3) Precursor Films and Powders by Electroless Deposition for Semiconductor Device Application," U.S. Patent No. 5,976,614 (2 November 1999).
  3. Bhattacharya, R.N.; Contreras, M.A.; Teeter, G. (2004). "18.5% CIGS Device Using Single-Layer, Chemical-Bath-Deposited ZnS(O,OH)." Japanese Journal of Applied Physics (43:11B); pp. L1475-L1476. Accessed July 26, 2012: http://dx.doi.org/10.1143/JJAP.43.L1475.
  4. Bhattacharya, R.N.; Spagnol, P.; Miao, H.; Marken, K.; Willis, J.O. (2004). "Nanoparticle Incorporated Superconducting Bi-2212 Tapes." Physics Status Solidi (a) (201:13); pp. 2880-2885. Accessed July 26, 2012: http://dx.doi.org/10.1002/pssa.200406858.
  5. Bhattacharya, R.N.; Batchelor, W.; Hiltner, J.F.; Sites, J.R. (2000). "Thin-film CuIn1-xGaxSe2 Photovoltaic Cells from Solution-Based Precursor Layers." Applied Physics Letters (75:6); Accessed July 26, 2012: http://dx.doi.org/10.1016/S0040-6090(99)00809-3.
  6. Bhattacharya, R.N.; Shen, H.; Parayanthal, P.; Pollak, F. H.; Coutts, T.; Aharoni, H. (1988). "Electroreflectance and Photoreflectance Study of the Space-Charge Region in Semiconductors: ITO/InP as a Model System." Physics Review B. (37:8); pp. 4044-4050. Accessed July 26, 2012: http://dx.doi.org/10.1103/PhysRevB.37.4044.

NREL Publications 

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