Journal
THIN SOLID FILMS
Volume 515, Issue 15, Pages 6243-6245Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2006.12.143
Keywords
electronic metastability; light soaking; Cu(In,Ga)Se-2; stretched exponential; defect relaxation
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The time constants of metastable defect reactions in Cu(In,Ga)Se-2 solar cells are analyzed in a temperature range of 340 to 390 K. Both, the increase of the open circuit voltage V-oc during illumination as well as the subsequent relaxation of the junction capacitance C follow a stretched exponential behavior. The activation energies are about 0.6 eV for the V-oc increase and 1.0 eV for the capacitance decay, while the time constants exhibit a cross-over at a temperature of 360 K. The exponential factor decreases in both cases with increasing temperature, a behavior that is rather uncommon for systems exhibiting stretched exponential relaxation. (C) 2007 Elsevier B.V. All rights reserved.
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