Journal
KOREAN JOURNAL OF CHEMICAL ENGINEERING
Volume 36, Issue 12, Pages 2110-2117Publisher
KOREAN INSTITUTE CHEMICAL ENGINEERS
DOI: 10.1007/s11814-019-0386-8
Keywords
CIGSe Compound; Solution Based Process; Spin-coating Method; CIGSe Thin Film Solar Cell
Funding
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea [20173010012980]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20173010012980] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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An ink solution based process, using spin-coating technique, followed by annealing in selenium environment with different temperature programs was utilized to prepare CIGSe thin films. Herein, the CuIn0.7Ga0.3Se2 nanocrystals were synthesized using ethanol - a green solvent. Three different solvents: 2-propanol, 2-methoxyethanol, and their 2 : 1 mixture (v/v ratio), were investigated as a dispersion medium for the as-synthesized CIGSe nanocrystals to form a stable ink solution. The last one- a mixture of 2-propanol : 2-methoxyethanol=2 : 1 (v/v), was found to be the most suitable. Furthermore, the influences of various annealing modes on the CIGSe grain size and density in the resulting film were also studied. The as-prepared CIGSe thin film was around 1 mu m thick and possessed a tetragonal structure. A newly developed cheaper and greener non-vacuum process was applied successfully from the synthesis of nanocrystals to the formation of ink solution, and produced high quality thin films; this opens a new route to the cost-competitive commercialization of CIGSe thin film solar cells.
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