Renewable energy will power the future of the world. I work on R&D of a promising new solar cell technology based on perovskite semiconductors. My interests - semiconductor device physics, solar cell engineering, inorganic chemistry, and experimental data analysis.

All Publications

  • Band Gap Tuning via Lattice Contraction and Octahedral Tilting in Perovskite Materials for Photovoltaics Journal of the American Chemical Society Prasanna, R., Gold-Parker, A., Leijtens, T., Conings, B., Babayigit, A., Boyen, H., Toney, M. F., McGehee, M. D. 2017; 139 (32)

    View details for DOI 10.1021/jacs.7b04981

  • Perovskite-perovskite tandem photovoltaics with optimized band gaps SCIENCE Eperon, G. E., Leijtens, T., Bush, K. A., Prasanna, R., Green, T., Wang, J. T., McMeekin, D. P., Volonakis, G., Milot, R. L., May, R., Palmstrom, A., Slotcavage, D. J., Belisle, R. A., Patel, J. B., Parrott, E. S., Sutton, R. J., Ma, W., Moghadam, F., Conings, B., Babayigit, A., Boyen, H., Bent, S., Giustino, F., Herz, L. M., Johnston, M. B., McGehee, M. D., Snaith, H. J. 2016; 354 (6314): 861-865


    We demonstrate four- and two-terminal perovskite-perovskite tandem solar cells with ideally matched band gaps. We develop an infrared-absorbing 1.2-electron volt band-gap perovskite, FA0.75Cs0.25Sn0.5Pb0.5I3, that can deliver 14.8% efficiency. By combining this material with a wider-band gap FA0.83Cs0.17Pb(I0.5Br0.5)3 material, we achieve monolithic two-terminal tandem efficiencies of 17.0% with >1.65-volt open-circuit voltage. We also make mechanically stacked four-terminal tandem cells and obtain 20.3% efficiency. Notably, we find that our infrared-absorbing perovskite cells exhibit excellent thermal and atmospheric stability, not previously achieved for Sn-based perovskites. This device architecture and materials set will enable "all-perovskite" thin-film solar cells to reach the highest efficiencies in the long term at the lowest costs.

    View details for DOI 10.1126/science.aaf9717

    View details for Web of Science ID 000388531900034

    View details for PubMedID 27856902

  • Mechanism of Tin Oxidation and Stabilization by Lead Substitution in Tin Halide Perovskites ACS Energy Letters Leijtens, T., Prasanna, R., Gold-Parker, A., Toney, M. F., McGehee, M. D. 2017; 2 (9): 2159
  • Trade-Off between Trap Filling, Trap Creation, and Charge Recombination Results in Performance Increase at Ultralow Doping Levels in Bulk Heterojunction Solar Cells ADVANCED ENERGY MATERIALS Shang, Z., Heumueller, T., Prasanna, R., Burkhard, G. F., Naab, B. D., Bao, Z., McGehee, M. D., Salleo, A. 2016; 6 (24)
  • Minimal Effect of the Hole-Transport Material Ionization Potential on the Open-Circuit Voltage of Perovskite Solar Cells ACS ENERGY LETTERS Belisle, R. A., Jain, P., Prasanna, R., Leijtens, T., McGehee, M. D. 2016; 1 (3): 556-560
  • How the Energetic Landscape in the Mixed Phase of Organic Bulk Heterojunction Solar Cells Evolves with Fullerene Content JOURNAL OF PHYSICAL CHEMISTRY C Sweetnam, S., Prasanna, R., Burke, T. M., Bartelt, J. A., McGehee, M. D. 2016; 120 (12): 6427-6434