MNCT Nakagawa Lab’s

Investigations on the Extension of the Life-span of a Dye-sensitized Solar Cell

Asada Fumiya

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

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

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

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

MNCT Nakagawa Lab’s

Power generation principle

Light

Pigment

I-

I2

Electrolysis solution

Opposite electrode

Power generation electrode

Titanium oxide

①Pigment which receives light

② Emitting the electron (Oxidization of pigment)

③Electric charge which moves

④Reproduction of pigment by electrolysis solution

MNCT Nakagawa Lab’s

Production of DSSC (Comparison)

Pigment： Stuck to titanium oxide

Pigment： Stuck to a shell membrane

Transparent electrode

Titanium oxide Titanium oxide

Shell membrane

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

MNCT Nakagawa Lab’s

Production of DSSC (Using egg membrane)

① ②

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

MNCT Nakagawa Lab’s

Measurement of DSSC

ISC[μA] VOC[mV] With no shell membrane 76.6 294 With a shell membrane 77.9 298

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

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