An, Hee Sang Cho, Yunae Park, Se Jin Jeon, Hyo Sang Hwang, Yun Jeong Kim, Dong-Wook Min, Byoung Koun 2024-01-20T10:33:30Z 2024-01-20T10:33:30Z 2021-09-04 2014-01-22 1944-8244 https://pubs.kist.re.kr/handle/201004/127212 To fabricate low-cost and printable wide-bandgap CuInxGa1-xS2 (CIGS) thin-film solar cells, a method based on a precursor solution was developed. In particular, under this method, multiple coatings with two pastes with different properties (e.g., viscosity) because of the different binder materials added were applied. Paste A could form a thin, dense layer enabling a high-efficiency solar cell but required several coating and drying cycles for the desired film thickness. On the other hand, paste B could easily form one-micrometer-thick films by means of a one-time spin-coating process but the porous microstructure limited the solar cell performance. Three different configurations of the CIGS films (A + B, B + A, and A + B + A) were realized by multiple coatings with the two pastes to find the optimal stacking configuration for a combination of the advantages of each paste. Solar cell devices using these films showed a notable difference in their photovoltaic characteristics. The bottom dense layer increased the minority carrier diffusion length and enhanced the short-circuit current. The top dense layer could suppress interface recombination but exhibited a low optical absorption, thereby decreasing the photocurrent. As a result, the A + B configuration could be suggested as a desirable simple stacking structure. The solar. cell with A + B coating showed a highly improved efficiency (4.66%) compared to the cell with a film prepared by paste B only (2.90%), achieved by simple insertion of a single thin (200 nm), dense layer between the Mo back contact and a thick porous CIGS layer. English American Chemical Society LOW-COST PRECURSOR CUINSE2 CIGS Cocktails of Paste Coatings for Performance Enhancement of CuInGaS2 Thin-Film Solar Cells Article 10.1021/am404164b 1 ACS Applied Materials & Interfaces, v.6, no.2, pp.888 - 893 ACS Applied Materials & Interfaces 6 2 888 893 scie scopus 000330201900022 2-s2.0-84892925194 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article LOW-COST PRECURSOR CUINSE2 CIGS chalcopyrite solar cells solution process sulfurization paste coating