Mechanisms limiting charge-carrier recombination and mobilities in metal halide perovskites (LACUS)
Event details
Date | 29.06.2017 |
Hour | 16:30 › 17:30 |
Speaker |
Prof. Laura Herz University of Oxford UK |
Location | |
Category | Conferences - Seminars |
This presentation first provides an overview of our recent work [1-7] elucidating the charge-carrier dynamics in organic-inorganic metal halide perovskites for solar cells with power-conversion efficiencies now exceeding 20%. We discuss the fundamental photophysics that has enabled these materials to be such efficient light-harvesters and charge collectors. We demonstrate how parameters essential for photovoltaic operation are altered with substitutions of the organic A cation (e.g. methyl ammonium, formamidinium or caesium), the metal M cation (e.g. Pb2+ or Sn2+) and the halide X anion (I- or Br-). We further analyze distinct mechanisms that limit the charge-carrier recombination and mobility in these perovskites, and their dependences on composition and temperature. We use these insights to predict charge-carrier diffusion lengths and radiative efficiencies in the limit of ultra-low trap-related recombination, which could potentially be reached through further advances in material processing.
[1] L. M. Herz, ACS Energy Lett., 2 (2017) DOI: 10.1021/acsenergylett.7b00276
[2] W. Rehman, D. P. McMeekin, J. B. Patel, R. L. Milot, M. B. Johnston, H. J. Snaith, and L. M. Herz, Energy Environ. Sci., 10 (2017), pp. 361-369.
[3] D. P. McMeekin, G. Sadoughi, W. Rehman, G. E. Eperon, M. Saliba, M. T. Hörantner, A. Haghighirad, N. Sakai, L. Korte, B. Rech, M. B. Johnston, L. M. Herz, and H. J. Snaith, Science, 351 (2016), pp. 151-155.
[4] A. D. Wright, C. Verdi, R. L. Milot, G. E. Eperon, M. A. Pérez-Osorio, H. J. Snaith, F. Giustino, M. B. Johnston, and L. M. Herz, Nature Communications, 7 (2016), p. 11755.
[5] M. B. Johnston and L. M. Herz, Acc. Chem. Res., 49 (2016), p. 146–154.
[6] W. Rehman, R. L. Milot, G. E. Eperon, C. Wehrenfennig, J. L. Boland, H. J. Snaith, M. B. Johnston, and L. M. Herz, Adv. Mater., 27 (2015), p. 7938–7944.
[7] R. L. Milot, G. E. Eperon, H. J. Snaith, M. B. Johnston, and L. M. Herz, Adv. Func. Mater., 25 (2015), p. 6218.
Practical information
- General public
- Free