| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 77663 | Solar Energy Materials and Solar Cells | 2016 | 8 Pages |
•Se-containing salts stabilize sols of CuInS2 nanocrystals and Se particles.•Annealing leads to formation of CuInSe2 films avoiding gas-phase selenization.•Use of (N2H5)2Se avoids formation of secondary phases during selenization.•Incorporation of Se particles enhances selenization and recrystallization.
Today, almost all solution-processed absorber layers for CIGS thin-film solar cells require a gas-phase selenization step after film deposition. In this contribution, the addition of excess selenium to CIGS precursor inks, either as elemental Se particles or Se2−-containing salts, is investigated as an alternative way to induce selenization during thermal annealing. Most importantly, we find that (N2H5)2Se is a selenium-containing additive that both stabilizes CuInS2 nanocrystal inks and induces the formation of a pure CuInSe2 phase.
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