Indoline-Based Molecular Engineering for Optimizing the Performance of Photoactive Thin Films
| Autor: | Byung-Man Kim, Hyun Sil Jung, Jun-Hyeok Park, Ming Yu Jin, Dong Guk Nam, Tae-Hyuk Kwon, Deok-Ho Roh, Do Hyun Ryu |
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| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Photocurrent Materials science Energy conversion efficiency 02 engineering and technology Molar absorptivity 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Photochemistry 01 natural sciences 0104 chemical sciences Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound Dye-sensitized solar cell chemistry Titanium dioxide Indoline Electrochemistry Thin film 0210 nano-technology Alkyl |
| Zdroj: | Advanced Functional Materials. 26:6876-6887 |
| ISSN: | 1616-301X |
| DOI: | 10.1002/adfm.201600951 |
| Popis: | 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 μm active and 2.5 μm 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 μm active layers, respectively. These results present a promising perspective of organic dye design for thin film DSCs. |
| Databáze: | OpenAIRE |
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