| Project/Area Number |
21750015
|
|---|
| Research Category |
Grant-in-Aid for Young Scientists (B)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
Physical chemistry
|
|---|
| Research Institution | Shinshu University |
|---|
Principal Investigator |
MORI Shogo Shinshu University, 繊維学部, 准教授 (10419418)
|
|---|
| Project Period (FY) |
2009 – 2010
|
| Project Status |
Completed (Fiscal Year 2010)
|
| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2010: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2009: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
|
|---|
| Keywords | 光物性 / ナノ材料 / 電子移動 / 電荷寿命 / 電荷再結合 / 半導体界面 / 色素分子構造 / 電子寿命 / 酸化チタン / 部分電荷密度 / 分散力 |
|---|
| Research Abstract |
The objectives of this study are to elucidate the effect of dye structures on the charge recombination in dye-sensitized solar cells (DSCs) and to propose the design guide for new sensitizers. The electron lifetime was measured for DSCs with dyes whose structures were systematically varied. It was found that the observed trends in the measured lifetime were explained by three factors : (1) blocking effect, (2) partial charges, and (3) dispersion forces. The blocking effect was controlled by the molecular size of the dyes and the density of adsorbed dyes. The partial charges mean how much charges are localized on particular atoms, e.g., oxygen and metal atoms. The dispersion force is determined by polarizability of sensitizers. Previously the effect of the dispersion force was not evident. This was because the effect was smaller than the others. Under the conditions that the effects of blocking effect and partial charges were little, the effect of dispersion force appeared. Based on the results, design guide for the dyes to retard recombination is to increase the adsorption density, to have little partial charges or leave those far from the surface of the TiO2, and to add obstacle moiety to the framework of the sensitizers. It was also effective to employ bulky redox couples to enhance the blocking effect.
|
