천연 염료를 이용한 염료 감응형 태양 전지 제작 및 평가

다국어 초록 (Multilingual Abstract)

by doctor-blade method as a photoanode of dye-sensitized solar cells (DSSCs). Herein, natural dyes including blueberry, eggplant, grape, red cabbage, mango and spinach were extracted using the boiling and grinding methods, respectively. As a control sample, the commercial N719 dye was also prepared. Among various natural dyes, the absorbance of blueberry, grape and red
cabbage dyes is quite similar to that of N719 dye, while mango and eggplant dyes shows the exponential increase of absorbance toward ultraviolet wavelength. But, in the case of spinach dye including the chlorophyll b, the absorbance was displayed in the certain range of ultra-violet wavelengths. Based on the absorbance of natural dyes, the photocurrent-voltage curves were
evaluated under solar simulator (AM 1.5, 100 mW/cm2). Among them, only red cabbage, blueberry and eggplant dyes based sensitized solar cells exhibit the meaningful conversion efficiency above 0.02 % with a open-circuit voltage (Voc) of above 0.4 V, a short-circuit photocurrent
(Jsc) of above 0.07 mA/cm2, a fill factor of above 50 %. Except for three dyes, other natural dyes exhibit the meaningless efficiencies. However, the conversion efficiency of three dyes based DSSCs are still low rather than that of N719 based DSSCs, being necessary for
further investigation.