Articles by Joanna A. Guse

In JoVE (1)

Rekombinasjon Dynamics i Thin-film Photovoltaic Materialer via Time-løst Mikrobølgeovn konduktivitet

Other Publications (1)

Physical Chemistry Chemical Physics : PCCP

Articles by Joanna A. Guse in JoVE

Engineering

Rekombinasjon Dynamics i Thin-film Photovoltaic Materialer via Time-løst Mikrobølgeovn konduktivitet Joanna A. Guse^1,2, Timothy W. Jones³, Andrew Danos⁴, Dane R. McCamey^1,2 ¹ARC Centre of Excellence in Exciton Science, ²School of Physics, University of New South Wales, ³CSIRO, CSIRO Energy Centre, ⁴School of Chemistry, University of New South Wales

Other articles by Joanna A. Guse on PubMed

Spectral Dependence of Direct and Trap-mediated Recombination Processes in Lead Halide Perovskites Using Time Resolved Microwave Conductivity Physical Chemistry Chemical Physics : PCCP. 04, 2016 | Pubmed ID: 27067120 Elucidating the decay mechanisms of photoexcited charge carriers is key to improving the efficiency of solar cells based on organo-lead halide perovskites. Here we investigate the spectral dependence (via above-, inter- and sub-bandgap optical excitations) of direct and trap-mediated decay processes in CH3NH3PbI3 using time resolved microwave conductivity (TRMC). We find that the total end-of-pulse mobility is excitation wavelength dependent - the mobility is maximized (172 cm(2) V(-1) s(-1)) when charge carriers are excited by near bandgap light (780 nm) in the low charge carrier density regime (10(9) photons per cm(2)), and is lower for above- and sub-bandgap excitations. Direct recombination is found to occur on the 100-400 ns timescale across excitation wavelengths near and above the bandgap, whereas indirect recombination processes displayed distinct behaviour following above- and sub-bandgap excitations, suggesting the influence of different trap distributions on recombination dynamics.

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