Nonradiative lifetime extraction using power-dependent relative photoluminescence of III-V semiconductor double-heterostructures
Abstract
A power-dependent relative photoluminescence measurement method is developed for double-heterostructures composed of III-V semiconductors. Analyzing the data yields insight into the radiative efficiency of the absorbing layer as a function of laser intensity. Four GaAs samples of different thicknesses are characterized, and the measured data are corrected for dependencies of carrier concentration and photon recycling. This correction procedure is described and discussed in detail in order to determine the material's Shockley-Read-Hall lifetime as a function of excitation intensity. The procedure assumes 100% internal radiative efficiency under the highest injection conditions, and we show this leads to less than 0.5% uncertainty. The resulting GaAs material demonstrates a 5.7 ± 0.5 ns nonradiative lifetime across all samples of similar doping (2–3 × 10^(17) cm^(−3)) for an injected excess carrier concentration below 4 × 10^(12) cm^(−3). This increases considerably up to longer than 1 μs under high injection levels due to a trap saturation effect. The method is also shown to give insight into bulk and interface recombination.
Additional Information
© 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Received 8 January 2016; accepted 29 March 2016; published online 15 April 2016. This work was partly funded by the German Federal Ministry for Economic Affairs and Energy (BMWi) through the project HekMod4 (Contract No. 0325750). S. Heckelmann and M. Niemeyer acknowledge the scholarship support from the German Federal Environmental Foundation (DBU).Attached Files
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Additional details
- Eprint ID
- 69157
- Resolver ID
- CaltechAUTHORS:20160722-083211879
- 0325750
- Bundesministerium für Wirtschaft und Energie (BMWi)
- Deutsche Bundesstiftung Umwelt (DBU)
- Created
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2016-07-25Created from EPrint's datestamp field
- Updated
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2021-11-11Created from EPrint's last_modified field