High V oc in (Cu,Ag)(In,Ga)Se2 Solar Cells

In this contribution, we show that silver substitution for copper in Cu(In,Ga)Se2 (CIGS) to form (Ag,Cu)(In,Ga)Se2 (ACIGS) leads to a reduction of the voltage loss expressed as Eg/q – V oc. This, in turn, leads to higher device efficiencies as compared to similar CIGS devices without Ag. We report [...

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Bibliographic Details
Published inIEEE journal of photovoltaics Vol. 7; no. 6; p. 1789
Main Authors Edoff, Marika, Jarmar, Tobias, Nina Shariati Nilsson, Wallin, Erik, Hogstrom, Daniel, Stolt, Olof, Lundberg, Olle, Shafarman, William, Stolt, Lars
Format Journal Article
LanguageEnglish
Published Piscataway The Institute of Electrical and Electronics Engineers, Inc. (IEEE) 01.01.2017
Subjects
Copper
Devices
Photovoltaic cells
Silver
Solar cells
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Summary:In this contribution, we show that silver substitution for copper in Cu(In,Ga)Se2 (CIGS) to form (Ag,Cu)(In,Ga)Se2 (ACIGS) leads to a reduction of the voltage loss expressed as Eg/q – V oc. This, in turn, leads to higher device efficiencies as compared to similar CIGS devices without Ag. We report [Formula Omitted] at 814 mV at a conversion efficiency of 21% for our best ACIGS device with 20% of the group I element consisting of silver. Comparing ACIGS and CIGS devices with the same Ga/(Ga + In) ratio, the ACIGS devices exhibit about 0.05 eV higher bandgap. Alkali postdeposition treatment with KF leads to improvements in efficiency both for CIGS and ACIGS, but we find that the dose of KF needed for optimum device for ACIGS is 10–20% of the dose used for CIGS.
ISSN:2156-3381
2156-3403
DOI:10.1109/JPHOTOV.2017.2756058