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Auger recombination dynamics of lead salts under picosecond free-electron-laser excitation

Findlay, P. C., Pidgeon, C. R., Kotitschke, R., Hollingworth, A., Murdin, B. N., Langerak, C. J. G. M., van der Meer, A. F. G., Ciesla, C. M., Oswald, J., Homer, A., Springholz, G. and Bauer, G. (1998) Auger recombination dynamics of lead salts under picosecond free-electron-laser excitation Physical Review B, 58 (12908). pp. 12908-12915. ISSN 0163-1829

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Abstract

Pump-probe transmission experiments have been performed on PbSe above the fundamental absorption edge near 4 μm in the temperature range 30 to 300 K, using the Dutch ps free-electron laser. For temperatures below 200 K and carrier densities above the threshold for stimulated emission, stimulated recombination represents the most efficient recombination mechanism with relatively fast kinetics in the 50–100-ps regime, in good agreement with earlier reports of photoluminescent emission. Above this temperature Auger recombination dominates, and the Auger coefficient C is determined from the pump-probe decay curves. In the low-temperature regime the Auger coefficient is determined from the decay curves at times beyond 100 ps. The Auger coefficient is approximately constant (with a value of about 8×10-28 cm6 s-1) between 300 and 70 K, and then drops a value of about 1×10-28 cm6 s-1 at 30 K, in good agreement with the theory for nonparabolic near-mirror bands and nondegenerate statistics. It is found that C for PbSe is between one and two orders of magnitude lower than for Hg1-xCdxTe of comparable band gap.

Item Type: Article
Additional Information: Published in Physical Review B, 58, 12908 - 12915. © 1998 The American Physical Society.
Divisions: Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute > Photonics
Faculty of Engineering and Physical Sciences > Physics
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:44
Last Modified: 23 Sep 2013 18:34
URI: http://epubs.surrey.ac.uk/id/eprint/1743

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