Published October 24, 2018
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Charge Carrier Lifetimes in Cr–Fe–Al–O Thin Films
Abstract
The effect of compositional variation on charge carrier lifetimes of Cr_1Fe_(0.84)Al_(0.16)O_3, a promising material for solar water splitting recently identified using combinatorial materials science, is explored using ultrafast time-resolved optical reflectance. The transient signal can be described by a biexponential decay, where the shorter time constant varies over 1 order of magnitude with changing Cr content while the longer one stays constant. Intrinsic performance limitations such as a low charge carrier mobility on the order of 10^(–3) cm^2/(Vs) are identified. Charge carrier lifetime and mobility are discussed as screening criteria for solar water splitting materials.
Additional Information
© 2018 American Chemical Society. Received: March 26, 2018. Accepted: September 24, 2018. Published: September 24, 2018. The authors would like to thank Bruce Parkinson and Andriy Zakutayev for fruitful discussions. The authors are grateful to the DFG for the financial support within the SPP1613 (LU1175/10-1, LU1175/10-2). S.M. is grateful for financial support from the BMBF through the MeOx4H2 project, funding no. 03SF0478A. H.S.S. acknowledges a PhD fellowship from the International Max Planck Research School for Surface and Interface Engineering (IMPRS-SurMat). H.S.S. and S.M. contributed equally. The manuscript was written through contributions of all authors. All authors have given approval to the final version of the manuscript. H.S.S. deposited the ML, wrote the paper, and analyzed the data. S.M. conducted the optical measurements, analyzed the data, and wrote the paper. K.S., D.F., and R.E. supervised the optical measurements. R.E. supervised the data analysis. A.L. supervised the deposition and data analysis. R.E. and A.L. edited the paper. The authors declare no competing financial interest.Attached Files
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Additional details
- Eprint ID
- 90900
- DOI
- 10.1021/acsami.8b04900
- Resolver ID
- CaltechAUTHORS:20181114-153057709
- LU1175/10-1
- Deutsche Forschungsgemeinschaft (DFG)
- LU1175/10-2
- Deutsche Forschungsgemeinschaft (DFG)
- 03SF0478A
- Bundesministerium für Bildung und Forschung (BMBF)
- Max-Planck-Gesellschaft
- Created
-
2018-11-15Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field