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제107회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Functionalized Organic Dyes Comprising 1H-Phenanthro[9,10-d]imidazole Donor for Dye-Sensitized Solar Cells Applications

2011년 2월 16일 13시 57분 40초
Ⅱ-ORGN.P-279 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
목 <발표Ⅱ>
저자 및
양유나, 조나라1, 고재중1, 홍종인
서울대학교 화학부, Korea
1고려대학교 소재화학과, Korea
In recent years, considerable attention has been paid to renewable natural energy sources due to a remarkable increase in worldwide energy consumption. Dye-sensitized solar cells (DSSCs) have received much attention as low cost next-generation solar cells. Compared to ruthenium based dyes, organic dyes have a variety of advantages such as large molar extinction coefficient, easy modification of molecular structures, relatively low material costs and environmentally friendly properties. As a key factor in highly efficient solar cells, dyes should possess several properties, for example, optimum absorption overlap with the solar spectrum for efficient light harvesting, appropriate HOMO and LUMO energy level for efficient electron injection and regeneration and hydrophobicity for minimizing charge recombination. Herein, we report on five functionalized organic dyes comprising 1H-Phenanthro[9,10-d]imidazole as a electron donor and cyanoacetic acid as a anchoring group which are linked by π-conjugated bridges such as phenylene and thiophenylene moieties, and device data of the DSSCs was fabricated using the five dyes. 1H-Phenanthro[9,10-d]imidazole not only exhibits good electron-donating ability, but also spatially separates the oxidized dye from the TiO2 surface which efficiently retards charge recombination. By incorporating butylphenyl on the donor moiety, we expected an increase in the electron donating ability which facilitates stronger intramolecular charge transfer (ICT) and a red shift of the absorption region as well as suppressing dye aggregation. Further, we designed a dye containing polyethylene glycol chains which coordinate Li+ ions and thus minimize charge recombination. In order to realize an wide-range absorption, we combined a squaraine dye with a donor moiety so that the absorption range can be extended up to near-IR region. The effect of the number of phenylene and functionalized moieties on the photophysical, electrochemical properties as well as photovoltaic performance was systematically investigated.