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US 8,617,642 B2Granted
Preparation of thin film for solar cell using paste
AssigneeKorea Institute of Science and Technology
InventorsOh-shim Joo, Byoung Koun Min, Kwang Deog Jung, Jun-haeng Lee
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Abstract
A preparation method of a CIS-based or CIGS-based thin film for a light absorption layer of a solar cell, which uses a paste prepared by mixing precursors of Cu, In, Se, and optional Ga in a solvent, minimizes the raw material loss, does not produce a toxic gas during the process, and is suitable for producing a large scale film at a low production cost.
Claims18
A method for preparing a CIS (Copper-Indium-Selenide)-based or CIGS (Copper-Indium-Gallium-Selenide)-based thin film for a light absorption layer of a solar cell, the method comprising:
- mixing precursors of Cu and In, optionally with a precursor of Ga into a first solvent to form a precursor mixture, wherein the precursor mixture is adjusted to have a pH of 10 or below and the first solvent comprises water and/or alcohol;
- isolating precipitates from the precursor mixture;
- heating the precipitates to obtain an oxide mixture;
- adding a Se precursor to the oxide mixture in a second solvent that comprises water and/or alcohol to obtain a paste;
- and
- coating the paste on a substrate to obtain a coated substrate and heating the coated substrate under an inert or reducing gas atmosphere.
3 more elements
Dependencies are inferred from the claim text.