| 학회 | 한국재료학회 |
| 학술대회 | 2011년 봄 (05/26 ~ 05/27, 제주 휘닉스 아일랜드) |
| 권호 | 17권 1호 |
| 발표분야 | C. Energy and the Environment Technology(에너지 및 환경재료) |
| 제목 | Mechanochemical Process of Stoichiometric CIGS Powders for Thin Film Solar Cell |
| 초록 | CuInGaSe (CIGS) has received a considerable attention as light absorbing semiconductor materials and has shown promising efficiency (~ 20%) for thin-film solar cells. The most famous technique for CIGS-thin film fabrication is thermal vacuum evaporation. However, it has a drawback of high process cost and difficult scale-up, which leaves much room for technical improvement. Non-vacuum process, such as ink-printing or spin casting, is an attractive alternative since CIGS precursors materials can be used without much loss in a scale large enough to fabricate a large panel. There are several approaches reported in preparation of CIGS inks for printing or casting (e.g. metal oxide ink, metal iodide ink, metal colloid ink etc.). Among them, a CIGS ink comprising compound-CIGS particles is most attractive because it contains little by-products and requires fewer steps than oxide and iodide inks. Here, we present the result of synthesizing CuInGaSe (CIGS) compounds for CIGS inks for non-vacuum process. We aimed to synthesize Cu(In,Ga)Se2 powders using elemental Cu, In, Ga, and Se metals as precursors. In order to obtain an optimum bandgap (1.14 eV) for the absorber layer, we fixed the molar ratio of Cu:In:Ga:Se to 1:0.7:0.3:2 and stoichiometrically synthesized them with planetary ball milling. We monitored the phase evolution during powder synthesis by X-ray Powder Diffraction (XRD) patterns and found that within 40 min, pure CuIn0.7Ga0.3Se2 phase was obtained. It was also found that milling conditions (ball type and ball-to-powder ratio, atmosphere, milling speed, etc.) and precursor ratio are critical in production of pure CIGS powders. Distribution of particle size was determined by Scanning Mobility Particle Sizer (SMPS) and morphology analysis by Scanning Electron Microscopy (SEM) will be also discussed. |
| 저자 | 송봉근1, 지현석1, 김경훈2, 조소혜1, 박형호3, 박종구1 |
| 소속 | 1한국과학기술(연), 2호남석유화학, 3연세대 |
| 키워드 | CuInGaSe (CIGS); mechanochemical process (MCP); planetary ball milling; solar cell |
