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Abstract
The selective removal of Cu2-x(S,Se) impurity phases from Cu2ZnSn(S,Se)4 (CZTSSe) and Cu(In,Ga)Se2 (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.
Original language | English (US) |
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Pages (from-to) | 5814-5821 |
Number of pages | 8 |
Journal | Green Chemistry |
Volume | 18 |
Issue number | 21 |
DOIs | |
State | Published - 2016 |
Bibliographical note
Publisher Copyright:© The Royal Society of Chemistry.
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Dive into the research topics of 'Selective removal of Cu2-:X(S,Se) phases from Cu2ZnSn(S,Se)4 thin films'. Together they form a unique fingerprint.Projects
- 2 Finished
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MRSEC IRG-2: Sustainable Nanocrystal Materials
Kortshagen, U. R., Aydil, E. S., Campbell, S. A., Francis, L. F., Haynes, C. L., Hogan, C., Mkhoyan, A., Shklovskii, B. I. & Wang, X.
11/1/14 → 10/31/20
Project: Research project
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