文献类型：期刊文献

英文题名：Effect of an auxiliary acceptor on D-A-π-A sensitizers for highly efficient and stable dye-sensitized solar cells

作者：Gao, Yuting[1,2,3];Li, Xing[1];Hu, Yue[4,5];Fan, Yeli[2,3];Yuan, Jianyong[1];Robertson, Neil[5];Hua, Jianli[1];Marder, Seth R.[2,3]

机构：[1]East China Univ Sci & Technol, Inst Fine Chem, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]Georgia Inst Technol, Sch Chem & Biochem, Atlanta, GA 30332 USA;[3]Georgia Inst Technol, Ctr Organ Photon & Elect, Atlanta, GA 30332 USA;[4]Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, 1037 Luoyu Rd, Wuhan 430074, Hubei Province, Peoples R China;[5]Univ Edinburgh, Sch Chem, Edinburgh EH9 3FJ, Midlothian, Scotland

年份：2016

卷号：4

期号：33

起止页码：12865

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20182605359691);WOS:【SCI-EXPANDED(收录号:WOS:000382015100021)】；

基金：This work was supported by NSFC for Creative Research Groups (21421004), NSFC/China (21372082, 21572062, 2116110444 and 91233207), and the Programme of Introducing Talents of Discipline to Universities (B16017). Gao would like to thank the funding of the visiting program, which is supported by the China Scholarship Council (CSC).

语种：英文

外文关键词：Solar power generation - Electrolytes - Ionic liquids

摘要：As one of the promising photovoltaic technologies, high performance metal-free dye-sensitized solar cells (DSSCs) have been explored due to the fact that they can be potentially produced using low-cost materials, their color can be tuned and they exhibit reasonable stability. Here three new organic donor-acceptor-pi-acceptor (D-A-pi-A) sensitizers (B-87, Q-85 and Q-93), containing benzothiadiazole and two new modified pyrido[3,4-b]pyrazines as the auxiliary acceptor, have been synthesized and employed in DSSCs. Among the three dyes, B-87 and Q-85 showed good photovoltaic performance with power conversion efficiencies (PCE) up to 10.2% and 10.0%, respectively, which contribute to the few examples of DSSCs synthesized using pure organic dyes with an iodine electrolyte to exceed the 10% efficiency barrier. It is noteworthy that an initial PCE of 7.16% has been achieved for B-87 based DSSCs with an ionic liquid electrolyte, which retained 95% of the initial efficiency after continuous light soaking for 1000 h at 60 degrees C, thus demonstrating outstanding stability. The molecular design strategy provides an effective approach to modulate the energy of the absorption bands as well as modify the optoelectronic and physical properties of the organic sensitizers to achieve highly efficient and stable sensitizers.