文献类型：期刊文献

英文题名：Incorporating quinoxaline unit as additional acceptor for constructing efficient donor-free solar cell sensitizers

作者：Shen, Chao[1,2];Wu, Yongzhen[1,2];Zhang, Weiwei[1,2];Jiang, Huiyun[1,2];Zhang, Hao[1,2];Li, Erpeng[1,2];Chen, Bingxu[3];Duan, Xuezhi[3];Zhu, Wei-Hong[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Collaborat Innovat Ctr Coal Based Energy I CCE, Shanghai Key Lab Funct Mat Chem,Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, Collaborat Innovat Ctr Coal Based Energy I CCE, Inst Fine Chem, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, State Key Lab Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2018

卷号：149

起止页码：65

外文期刊名：DYES AND PIGMENTS

收录：;EI(收录号：20174004225027);WOS:【SCI-EXPANDED(收录号:WOS:000423246900008)】；

基金：This work was supported by NSFC for Creative Research Groups (21421004), Distinguished Young Scholars (21325625), Key Project (21636002), NSFC/China, the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, Science and Technology Commission of Shanghai Municipality (15XD1501400 and 17ZR1407400), and the Fundamental Research Funds for the Central Universities (WJ1416005 and WJ1714007).

语种：英文

外文关键词：Dye-sensitized solar cells; Organic sensitizers; Donor-free; Quinoxaline; Cyclopentadithiophene

摘要：Donor-free organic dyes that do not contain typical arylamine groups have been recently recognized as a new model for designing efficient photosensitizers for application in dye-sensitized solar cells. Until now, the most efficient donor-free sensitizers are composed of oligo-thiophenes or covalently connected cyclopentadithiophene (CPDT) units with one terminal of cyanoacetic acid as the anchoring group. In this paper, we propose a new strategy for improving the performance of CPDT based donor-free dyes by incorporating an electron-deficient quinoxaline unit into the it-chain. Three new donor-free dyes of SC1-3 with main difference of number and location of long alkyl chains are designed and synthesized. The incorporated electron-deficient quinoxaline unit is found to enhance the intramolecular charge transfer transition and weaken the deprotonation effect on absorption properties, resulting in an improved light harvesting efficiency relative to the reference dye CPDT-3. The influence of long alkyl chains on the optical and electronic properties as well as photovoltaic performance is systematically studied. When applied in iodide-triiodide electrolyte based DSSCs, the best performing quinoxaline based donor-free dye SC-1 shows a power conversion efficiency (PCE) of 8.05%, which is 20% higher than that of reported donor-free dye CPDT-3 (PCE of 6.7%). (C) 2017 Elsevier Ltd. All rights reserved.