Four new type II organic dyes with D-n-A structure （donor-n-conjugated-acceptor） and two typical type II sen- sitizers based on catechol as reference dyes are synthesized and applied in dye sensitized solar cells （...Four new type II organic dyes with D-n-A structure （donor-n-conjugated-acceptor） and two typical type II sen- sitizers based on catechol as reference dyes are synthesized and applied in dye sensitized solar cells （DSCs）. The four dyes can be adsorbed on TiO2 through hydroxyl group directly. Electron injection can occur not only through the anchoring group （hydroxyl group） but also through the electron-withdrawing group （-CN） located close to the semiconductor surface. Experimental results show that the type II sensitizers with a D-π-A system obviously out- perform the typical type II sensitizers providing much higher conversion efficiency due to the strong electronic push-pull effect. Among these dyes, LS223 gives the best solar energy conversion efficiency of 3.6%, with Jsc = 7.3 mAocm 2, Voc=0.69 V, FF=0.71, the maximum IPCE value reaches 74.9%.展开更多
基金We gratefully acknowledge the financial support of this work from China Natural Science Foundation （No. 21076039）, the National Basic Research Program of China （No. 2009CB220009）, the Ministry of Science and Technology （MOST） （No. 2001CCA02500）, the Program for Innovative Research Team of Liaoning Province （No. LS2010042）, the Swedish Energy Agency, K＆A Wallenberg Foundation, and the State Key Laboratory of Fine Chemicals （No. KF0805）.
文摘Four new type II organic dyes with D-n-A structure （donor-n-conjugated-acceptor） and two typical type II sen- sitizers based on catechol as reference dyes are synthesized and applied in dye sensitized solar cells （DSCs）. The four dyes can be adsorbed on TiO2 through hydroxyl group directly. Electron injection can occur not only through the anchoring group （hydroxyl group） but also through the electron-withdrawing group （-CN） located close to the semiconductor surface. Experimental results show that the type II sensitizers with a D-π-A system obviously out- perform the typical type II sensitizers providing much higher conversion efficiency due to the strong electronic push-pull effect. Among these dyes, LS223 gives the best solar energy conversion efficiency of 3.6%, with Jsc = 7.3 mAocm 2, Voc=0.69 V, FF=0.71, the maximum IPCE value reaches 74.9%.
