Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 21, Issue 4, Pages 756-763Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201001801
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Funding
- NSFC/China
- NSFC [90922004]
- National Basic Research Program of China [2011CB933302, 2011CB933300]
- Shanghai Shuguang Project [07SG34]
- Shanghai Pujiang Program [090PJ1401300]
- Shanghai Institutions of Higher Learning
- Shanghai Non-Governmental Cooperation Project [10530705300]
- Shanghai Leading Academic Discipline Project [B108]
- Specialized Research Fund for the Doctoral Program of Higher Education [SRFDP 200802510011]
- State Key Laboratory of Precision Spectroscopy (ECNU)
- National College Students Innovation Experiment Program [091025127]
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A novel concept D-A-pi-A organic sensitizer instead of traditional D-pi-A ones is proposed. Remarkably, the incorporated low bandgap, strong electron-withdrawing unit of benzothiadiazole shows several favorable characteristics in the areas of light-harvesting and efficiency: i) optimized energy levels, resulting in a large responsive range of wavelengths into NIR region; ii) a very small blue-shift in the absorption peak on thin TiO2 films with respect to that in solution; iii) an improvement in the electron distribution of the donor unit to distinctly increase the photo-stability of synthetic intermediates and final sensitizers. The stability and spectral response of indoline dye-based DSSCs are improved by the strong electron-withdrawing benzothiadizole unit in the conjugation bridge. The incident-photon-conversion effi ciency of WS-2 reaches nearly 850 nm with a power conversion effi ciency as high as 8.7% in liquid electrolyte and 6.6% in ionic-liquid electrolyte.
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