| 학회 |
한국고분자학회 |
| 학술대회 |
2005년 가을 (10/13 ~ 10/14, 제주 ICC) |
| 권호 |
30권 2호 |
| 발표분야 |
기능성 고분자 |
| 제목 |
Cation Effect on the Performance of the Dye-Sensitized Solar Cells using PHB Electrolyte |
| 초록 |
There have been many attempt to increase the overall conversion efficiency of DSSCs, employing liquid-state electrolytes. However, this type of DSSCs have critical problems such as solvent leakage or evaporation and poor mechanical strength for a long term operation. To overcome the drawback of the liquid electrolyte, the solid-state electrolyte has been widely focused in these days. We fabricated solid-state polymer electrolyte referred to as a PHB(PEG with hydrogen bonding sites). DSSCs using this electrolyte yielded high value of cell performance such as increased in conversion efficiency and fill factor as well as better interfacial properties compared to DSSCs employing previously reported polymer electrolytes. To investigate cation effect on the cell performance of PHB, we have used several kinds of measurement such as photovoltaic characterization, electrochemical impedance spectroscopy and SECM method. In DSSCs, interfacial properties are much more important than bulk properties because of all processes such as photogeneration, separation and charge recombination take place at the heterointerface. Therefore, we have investigated theses crucial interfacial properties determining overall performance of DSSCs by EIS(electrochemical impedance spectroscopy). Also we have examined electron transport properties in TiO2 mesoporous structure and diffusion properties of I-/I3- redox couple in the polymer electrolyte. This is a major part to determine the overall cell performance of DSSCs. PHB with various cations exibits slightly lower ion conductivity and lower charge transfer resistance than that of polymer electrolyte obtained by oligomer approach such as PEGDME based electrolyte. Although ion conductivity is slightly lower than PEGDME based electrolyte, the high performance was obtained when the PHB based electrolyted was employed in DSSCs. This result indicates better interfacial properties, faster electron diffusion and longer electron lifetime of PHB than PEGDME. Over 4% of high efficiencies are obtained at high active area(0.45cm2) and these results have advantages to fabricate the large area solar cells with a high performance. |
| 저자 |
이용건1, 염준호2, 김선영2, 강문성2, 박종혁2, 차국헌1, 강용수3
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| 소속 |
1서울대, 2한국과학기술(연), 3한양대 응용화학공학부 |
| 키워드 |
dye sensitized solar cell; polymer electrolyte; cation; interfacial resistance; electron diffusion
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| E-Mail |
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