Cu(In,Ga)Se 2 thin films have been used as a light absorbing layer in high-efficiency solar cells. Among many methods, the powder process for fabricating Cu(In,Ga)Se 2 thin films is advantageous, due to its simplicity and minimal usage of materials. However, Cu(In,Ga)Se 2 layers produced by the powder process often result in high porosity and small grain sizes, which has been a significant barrier to wide application. In this report, we demonstrate that simple compression of the Cu(In,Ga)S 2 powder coat and a cost-efficient selenization using a mixture of Se and Al 2 O 3 can reduce porosity and enlarge the grain size. It is surmised that improved particle packing density in the powder coats, in addition to sintering with a steady supply of Se vapor, synergistically enhances highly sintered Cu(In,Ga)Se 2 thin films.
Bibliographical noteFunding Information:
This work was supported by the KIST institutional funding [grant number: 2E28020 ] and the R&D Convergence Program of NST (National Research Council of Science & Technology) of Republic of Korea [grant number: CAP-16-10-KIMS ]].
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Physics and Astronomy(all)
- Surfaces and Interfaces
- Surfaces, Coatings and Films