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Hybrid metal halide perovskites: optoelectronic properties and stability (Conference Presentation)
Author(s): Laura Herz

Paper Abstract

Hybrid metal halide perovskites (stoichiometry AMX3) have recently emerged as low-cost active materials in PV cells with power conversion efficiencies in excess of 21%. We discuss how parameters essential for photovoltaic operation, such as crystallinity, photostability, charge carrier mobility and diffusion lengths are altered with substitutions of the organic A cation (e.g. methylammonium versus formamidinium), the metal M cation (e.g. Pb2+ or Sn2+) and the halide X anion (I- versus Br-). We focus on two 3D perovskite systems that have attracted interest lately, lead-free ASnI3 (optical bandgap ~1.3 eV) and the mixed organic lead iodide/bromide system APb(BryI1-y)3 whose band gap can be tailored between ~1.5 eV (FAPbI3) and ~2.3 eV (FAPbBr3). We show that unintentional hole doping in tin iodide perovskites introduces fast recombination pathways that can be moderated by crystal structure [1] and introduces a radiative quasi-monomolecular charge recombination channel [2]. In addition, we demonstrate that charge-carrier diffusion and recombination in FA1-xCsxPb(BryI1-y)3 depends on a complex interplay between changes in morphology and electronic bandstructure with bromide fraction y [3,4,5]. References [1] Parrott, Milot, Stergiopoulos, Snaith, Johnston, Herz, J. Phys. Chem. Lett. 7, 1321 (2016). [2] Milot, Eperon, Green, Snaith, Johnston, Herz, J. Phys. Chem. Lett. 7, 4178 (2016). [3] Rehman, Milot, Eperon, Wehrenfennig, Boland, Snaith, Johnston, Herz, Adv. Mater. 27, 7938 (2015). [4] McMeekin, Sadoughi, Rehman, Eperon, Saliba, Hörantner, Haghighirad, Sakai, Korte, Rech, Johnston, Herz, Snaith, Science 351, 151 (2016). [5] Rehman, McMeekin, Patel, Milot, Johnston, Snaith, Herz, Energy Environ. Sci. 10, 361 (2017).

Paper Details

Date Published: 19 September 2017
Proc. SPIE 10363, Organic, Hybrid, and Perovskite Photovoltaics XVIII, 1036309 (19 September 2017); doi: 10.1117/12.2272727
Show Author Affiliations
Laura Herz, Univ. of Oxford (United Kingdom)

Published in SPIE Proceedings Vol. 10363:
Organic, Hybrid, and Perovskite Photovoltaics XVIII
Zakya H. Kafafi; Paul A. Lane; Kwanghee Lee, Editor(s)

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