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 membranesExtraction 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 membranesResults 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 oxideTitanium 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

②③

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 on ② 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 294With 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

ConclusionInvestigation 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