Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 26, Issue 38, Pages 6876-6887Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201600951
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Funding
- National Research Foundation of Korea [NRF-2013R1A1A2059838, 2013R1A1A2073207]
- Korea Institute of Energy Technology Evaluation and Planning [20143030011560]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20143030011560] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2013R1A1A2073207] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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New indoline dyes (RK-1-4) were designed with a planar geometry and high molar extinction coefficient, which provided surprising power conversion efficiency (PCE) with a thin titanium dioxide film in dye-sensitized solar cells (DSCs). They had a difference in only alkyl chain length. Despite the same molecular structure, the performance of the respective DSCs varied significantly. Investigating the dye adsorption processes and charge transfer kinetics, the alkyl chain length was determined to affect the dye surface coverage as well as the recombination between the injected photoelectrons and the oxidized redox mediators. When applied to the DSCs as a light harvester, RK-3 with the dodecyl group exhibited the best photocurrent density, consequently achieving the best PCE of 9.1% with a 1.8 mu m active and 2.5 mu m scattering layer because of the most favorable charge injection. However, when increasing the active layer thickness, overall device performance deteriorated and the charge collection and regeneration played major roles for determining the PCE. Therefore, RK-2 featuring the highest surface coverage and moderate alkyl chain length obtained the highest PCEs of 8.8% and 7.9% with 3.5 and 5.1 mu m active layers, respectively. These results present a promising perspective of organic dye design for thin film DSCs.
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