1. MNCT Nakagawa Lab’s Investigations on the Extension of the Life-span of a Dye-sensitized Solar Cell Asada Fumiya

2. MNCT Nakagawa Lab’s Purpose Dye-sensitized solar cell (DSSC) → Low cost → A variety of colors and forms Problems → Low power generation efficiency → Short-lived Source ： Aisin Seiki

3. MNCT Nakagawa Lab’s Purpose Previous work by Yonago Kosen ： Using a shell membrane → Longer operating life DSSC → An experiment with only food pigment Absorption of various pigments and extension of life-span

4. MNCT Nakagawa Lab’s Extraction of shell membranes Extraction work of egg membranes which requires time →Consideration of how to carry out extensive extraction and to save egg membranes The rate of pigment absorption conditioned by methods of preservation → Investigation immediately after extraction, room temperature (23 ℃ ), and freezing

5. MNCT Nakagawa Lab’s Extraction of shell membranes Results of the investigation ① Immediately after extraction and frozen storage → Dyed at the rate of almost 100% ② Room temperature preservation → Dyed at the rate of about 90% Determination of frozen storage

6. MNCT Nakagawa Lab’s Power generation principle Light Pigment I-I- I2I2 Electrolysis solution Opposite electrode Power generation electrode Titanium oxide ① Pigment which receives light ② Emitting the electron (Oxidization of pigment) ③ Electric charge which moves ④ Reproduction of pigment by electrolysis solution

7. MNCT Nakagawa Lab’s Production of DSSC (Comparison) Pigment ： Stuck to titanium oxide Pigment ： Stuck to a shell membrane Transparent electrode Titanium oxide Shell membrane

8. MNCT Nakagawa Lab’s Production of DSSC (Not using egg membrane) One day after Opposite electrode ： Carbon is applied. Power generation electrode ： Pigment is applied to titanium oxide. ① ② ③ Extraction of pigment (Hibiscus) Iodine liquid applied to both power generation electrodes →Combining electrodes

9. MNCT Nakagawa Lab’s Production of DSSC (Using egg membrane) ①② ③ ④ Applying titanium oxide to a transparent electrode Absorbed pigment into egg membrane → Dipping in titanium oxide solution Power generation electrode ： sticking ② on ① Opposite electrode ： Applied carbon The additional iodine liquid to a power generation electrode →Setting electrodes

10. MNCT Nakagawa Lab’s Measurement of DSSC I SC [μA]V OC [mV] With no shell membrane76.6294 With a shell membrane77.9298 Power generation characteristics Fall in power generation caused by heat Using ventilation to prevent rising temperature The necessity for encapsulation Hastening of the evaporation of electrolysis solution using ventilation The problem of measurement

11. MNCT Nakagawa Lab’s Conclusion Investigation on the method of the preservation of egg membrane → Increased efficiency in egg membrane extraction Production of two kinds of DSSCs, one with shell membrane and the other without it → ① To check power generation characteristics ② Decision on a manufacture method and a measuring method

12. MNCT Nakagawa Lab’s Future schedule Comparative experiments on the life of an egg membrane Comparative experiments on the life span by changing pigments

13. MNCT Nakagawa Lab’s Extraction of shell membranes (Result) Frozen At Room Temperature

14. MNCT Nakagawa Lab’s Natural pigments

15. MNCT Nakagawa Lab’s Power generation characteristic Voltage Current