Journal
GREEN CHEMISTRY
Volume 18, Issue 21, Pages 5814-5821Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6gc01287f
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Funding
- Environmental and Natural Resources Trust Fund (ENRTF) from State of Minnesota
- NSF through the UMN MRSEC program [DMR-1420013]
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The selective removal of Cu2-x(S,Se) impurity phases from Cu2ZnSn(S,Se)(4) (CZTSSe) and Cu(In,Ga)Se-2 (CIGS) thin films is a major barrier to achieving high efficiencies in solar cells based on these films. A toxic and hazardous potassium cyanide (KCN) solution is commonly used as a selective etchant to remove Cu2-x(S,Se) from CZTSSe and CIGS thin films. Herein, we report the selective removal of Cu2-x(S,Se) compounds from kesterite CZTSSe thin films using a mixture of ethylenediamine and 2-mercaptoethanol, a safer chemical mixture than KCN. We found that Cu2-xS and kesterite CZTS nanocrystals dissolve in this mixture in seconds and 6 hours, respectively, while wurtzite CZTS nanocrystals do not dissolve even after 6 hours. Etching CZTSSe thin films containing small amounts of Cu2-x(S,Se) phases for 20 minutes removes the Cu2-x(S,Se) phases completely.
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