文献类型：期刊文献

英文题名：Organic D-A-π-A Solar Cell Sensitizers with Improved Stability and Spectral Response

作者：Zhu, Weihong[1,2];Wu, Yongzhen[1,2];Wang, Shutao[3,4];Li, Wenqin[1,2];Li, Xin[1,2];Chen, Jian[1,2];Wang, Zhong-sheng[3,4];Tian, He[1,2]

机构：[1]E China Univ Sci & Technol, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Inst Fine Chem, Shanghai 200237, Peoples R China;[3]Fudan Univ, Dept Chem, Shanghai 200433, Peoples R China;[4]Fudan Univ, Adv Mat Lab, Shanghai 200433, Peoples R China

年份：2011

卷号：21

期号：4

起止页码：756

外文期刊名：ADVANCED FUNCTIONAL MATERIALS

收录：;EI(收录号：20110813681460);WOS:【SCI-EXPANDED(收录号:WOS:000287667800017)】；

基金：This work was supported by NSFC/China, Major NSFC Program (90922004), National Basic Research Program of China (No. 2011CB933302, 2011CB933300), Shanghai Shuguang Project (07SG34), Shanghai Pujiang Program (090PJ1401300), the Program for Professor of Special Appointment at 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), and the National College Students Innovation Experiment Program (091025127).

语种：英文

外文关键词：Conversion efficiency - Ionic liquids - Electrolytes - Stability - Photons - Reaction intermediates - Electrons - Image enhancement - Titanium dioxide

摘要：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.