Projects per year
Abstract
The hybrid perovskite CH3NH3PbI3 (MAPI) exhibits long minority-carrier lifetimes and diffusion lengths. We show that slow recombination originates from a spin-split indirect-gap. Large internal electric fields act on spin-orbit-coupled band extrema, shifting band-edges to inequivalent wavevectors, making the fundamental gap indirect. From a description of photoluminescence within the quasiparticle self-consistent GW approximation for MAPI, CdTe, and GaAs, we predict carrier lifetime as a function of light intensity and temperature. At operating conditions we find radiative recombination in MAPI is reduced by a factor of more than 350 compared to direct gap behavior. The indirect gap is retained with dynamic disorder.
Original language | English |
---|---|
Article number | 091501 |
Number of pages | 8 |
Journal | APL Materials |
Volume | 4 |
Issue number | 9 |
Early online date | 21 Jul 2016 |
DOIs | |
Publication status | Published - Sept 2016 |
Fingerprint
Dive into the research topics of 'Research Update: Relativistic origin of slow electron-hole recombination in hybrid halide perovskite solar cells'. Together they form a unique fingerprint.Projects
- 1 Finished
-
Multi-Scale Modelling of Hybrid Perovskites for Solar Cells
EPSRC Engineering and Physical Sciences Research Council
1/01/2015 → 31/12/2017
Project: Research
Datasets
-
Relativistic origin of slow electron-hole recombination in hybrid halide Perovskite solar cells
Azarhoosh, P., McKechnie, S., Van Schilfgaarde, M., Walsh, A. & Frost, J. M., King's College London, 23 Aug 2016
DOI: 10.18742/rdm01-34, https://kcl.figshare.com/articles/dataset/Relativistic_origin_of_slow_electron-hole_recombination_in_hybrid_halide_Perovskite_solar_cells/16473645
Dataset