Four-wave mixing response of solution-processed CH3NH3PbI3 thin films

Samuel A. March; Drew B. Riley; Charlotte Clegg; Daniel Webber; Seth Todd; Ian G. Hill; Kimberley C. Hall

doi:10.1117/12.2252709

23 February 2017 Four-wave mixing response of solution-processed CH₃NH₃PbI₃ thin films

Samuel A. March, Drew B. Riley, Charlotte Clegg, Daniel Webber, Seth Todd, Ian G. Hill, Kimberley C. Hall

Proceedings Volume 10102, Ultrafast Phenomena and Nanophotonics XXI; 1010211 (2017) https://doi.org/10.1117/12.2252709
Event: SPIE OPTO, 2017, San Francisco, California, United States

Abstract

The interest in perovskite-based solar cell absorber materials has skyrocketed in recent years due to the rapid rise in solar cell efficiency and the potential for cost reductions tied to solution-processed device fabrication. Due to complications associated with the presence of strong static and dynamic disorder in these organic-inorganic materials, the fundamental photophysical behavior of photo-excited charge carriers remains unclear. We apply four-wave mixing spectroscopy to study the charge carrier dynamics in CH₃NH₃PbI₃ thin films. Our experiments reveal two discrete optical transitions below the band gap of the semiconductor with binding energies of 13 meV and 29 meV, attributed to free and defect-bound excitons respectively.

Citation Download Citation

Samuel A. March, Drew B. Riley, Charlotte Clegg, Daniel Webber, Seth Todd, Ian G. Hill, and Kimberley C. Hall "Four-wave mixing response of solution-processed CH₃NH₃PbI₃ thin films", Proc. SPIE 10102, Ultrafast Phenomena and Nanophotonics XXI, 1010211 (23 February 2017); https://doi.org/10.1117/12.2252709

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KEYWORDS

Excitons

Four wave mixing

Thin films

Perovskite

Signal detection

Solar cells

Absorption

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