Renewable Energy

Green Energy

In our laboratory, we investigate green-energy related technologies, such as solar cells and Hydrogen sensors using optical spectroscopic techniques. Since optical characteristics of such materials and phenomena can be detected using Raman spectroscopy and photoluminescence without damaging the material itself, these are very powerful and important tool to study, and further, to implant in mass production. We are collaborating with various institutes to characterize solar cells including Korea Institute of Energy Research and Sumy state University in Ukraine. For Hydrogen sensors, we make ourselves using sputters.



Solar Cells

Solar cells are semiconductors which convert Sun light into electricity. Since the fossil energies are severe cause of pollution, developing and using solar cells are urgent and mandatory. Among various types of solar cells, thin film solar cells are drawing attention for saving raw materials and its application for flexible uses.




Cu(In,Ga)Se2(CIGS) thin films are considered as one of the most promising material for thin film solar cells because it has tunable and ideal band gap as a solar cell which is direct band gap, unlike Si which is indirect band gap. Therefore, it absorbs Sun light very well especially in the range of most effective solar spectrum. Also, it reached the highest efficiency of 20.3%[1] for thin film solar cells. In our lab, we characterize the CIGS solar cells by Raman spectroscopy and photoluminescence (PL).

Cu2ZnSn(S,Se)4 (CZT(S,Se))

CZTS thin films are new material for thin film solar cells using only earth abundant materials. Since it is a new material, the exact bandgap or even distinct structure of thin films were recently confined. Especially, bandgap of CZTSe was settled by electroreflectence experiment in our lab.

Optical Hydrogen Sensor

Critical element for wide spread adoption of hydrogen technology
Optical sensing: Detect the change in color (optical transmittance) of the sensing element


1. No electrical current in the sensing head
2. Remote sensing using optical fiber
3. Possibility of optical multiplexing and long distance sensing

4th Prototype (2008)

3rd Prototype (2007)



[1] Philip Jackson et al., "New world record efficiency for Cu(In,Ga)Se2 thin-film solar cells beyond 20%," Procress in photovoltaics: research and applications, pp. 19, 894-897, 2011.
[2] MyoungGuk Park et al., “Chaacteristics of Cu(In,Ga)Se2 (CIGS) thin films deposited by a direct solution coating process”, Journal of Alloys and Compounds, pp. 68, 513, 2012.
[3] Doyoung Park et al, “Optical characterization of Cu2ZnSnSe4 grown by thermal co-evaporation”, Thin Solid Films, pp.7389, 519, 2011
서강대학교 주소 및 개인정보처리방침
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