1. High molar extinction coefficient organic sensitizers for efficient dye-sensitized solar cells
- Author
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Michael Grätzel, Chulwoo Kim, Jaejung Ko, Jun-Ho Yum, Hyunbong Choi, Ines Raabe, Francesca Teocoli, Kihyung Song, Duckhyun Kim, and Md. K. Nazeeruddin
- Subjects
Light ,Ruthenium Sensitizers ,Absorptivity ,thienothiopenes ,Analytical chemistry ,solid-state electrolytes ,Electrolyte ,Photochemistry ,Catalysis ,law.invention ,chemistry.chemical_compound ,Conversion-Efficiency ,Photovoltaic Performance ,law ,Solar cell ,Film ,Photocurrent ,Liquid ,Organic Chemistry ,Energy conversion efficiency ,General Chemistry ,Molar absorptivity ,Dye-sensitized solar cell ,chemistry ,Ionic liquid ,sensitizers ,solar cells ,dyes/pigments ,Short circuit - Abstract
We have designed and synthesized highly efficient organic sensitizers with a planar thienothiophene-vinylene-thienothiophene linker. Under standard global AM 1.5 solar conditions, the JK-113-sensitized cell gave a short circuit photocurrent density (J(sc)) of 17.61 mA cm(-2), an open-circuit voltage (V(oc)) of 0.71 V, and a fill factor (FF) of 72%, corresponding to an overall conversion efficiency (eta) of 9.1%. The incident monochromatic photo-to-current conversion efficiency (IPCE) of JK-113 exceeds 80% over the spectral region from 400 to 640 nm, reaching its maximum of 93% at 475 nm. The band tails off toward 770 nm, contributing to the broad spectral light harvesting. Solar-cell devices based on the sensitizer JK-113 in conjunction with a volatile electrolyte and a solvent-free ionic liquid electrolyte gave high conversion efficiencies of 9.1% and 7.9%, respectively. The JK-113-based solar cell fabricated using a solvent-free ionic liquid electrolyte showed excellent stability under light soaking at 60 degrees C for 1000 h.
- Published
- 2009