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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 12 — Jun. 4, 2012
  • pp: 12675–12681

Ultrafast carrier dynamics in Cu(In,Ga)Se2 thin films probed by femtosecond pump-probe spectroscopy

Shih-Chen Chen, Yu-Kuang Liao, Hsueh-Ju Chen, Chia-Hsiang Chen, Chih-Huang Lai, Yu-Lun Chueh, Hao-Chung Kuo, Kaung-Hsiung Wu, Jenh-Yih Juang, Shun-Jen Cheng, Tung-Po Hsieh, and Takayoshi Kobayashi  »View Author Affiliations


Optics Express, Vol. 20, Issue 12, pp. 12675-12681 (2012)
http://dx.doi.org/10.1364/OE.20.012675


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Abstract

Ultrafast carrier dynamics in Cu(In,Ga)Se2 films are investigated using femtosecond pump-probe spectroscopy. Samples prepared by direct sputtering and co-evaporation processes, which exhibited remarkably different crystalline structures and free carrier densities, were found to result in substantially different carrier relaxation and recombination mechanisms. For the sputtered CIGS films, electron-electron scattering and Auger recombination was observed, whereas for the co-evaporated CIGS films, bandgap renormalization accompanied by band filling effect and hot phonon relaxation was observed. The lifetime of defect-related recombination in the co-evaporated CIGS films is much longer than that in the direct-sputtered CIGS films, reflecting a better quality with higher energy conversion efficiency of the former.

© 2012 OSA

OCIS Codes
(040.5350) Detectors : Photovoltaic
(300.6530) Spectroscopy : Spectroscopy, ultrafast

ToC Category:
Solar Energy

History
Original Manuscript: March 16, 2012
Revised Manuscript: April 26, 2012
Manuscript Accepted: May 9, 2012
Published: May 21, 2012

Citation
Shih-Chen Chen, Yu-Kuang Liao, Hsueh-Ju Chen, Chia-Hsiang Chen, Chih-Huang Lai, Yu-Lun Chueh, Hao-Chung Kuo, Kaung-Hsiung Wu, Jenh-Yih Juang, Shun-Jen Cheng, Tung-Po Hsieh, and Takayoshi Kobayashi, "Ultrafast carrier dynamics in Cu(In,Ga)Se2 thin films probed by femtosecond pump-probe spectroscopy," Opt. Express 20, 12675-12681 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-12-12675


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