文献类型：期刊文献

英文题名：Cosensitization process effect of D-A-π-A featured dyes on photovoltaic performances

作者：Liu, Bo[1,2];Chai, Qipeng[1];Zhang, Weiwei[1];Wu, Wenjun[1];Tian, He[1];Zhu, Wei-Hong[1]

机构：[1]East China Univ Sci & Technol, Key Lab Adv Mat & Inst Fine Chem, Shanghai Key Lab Funct Mat Chem, Collaborat Innovat Ctr Coal Based Energy I CCE,Sc, Shanghai 200237, Peoples R China;[2]Hebei Normal Univ, Coll Chem & Mat Sci, 20 East Rd Nan Er Huan, Shijiazhuang 050023, Hebei, Peoples R China

年份：2016

卷号：1

期号：1

起止页码：84

外文期刊名：GREEN ENERGY & ENVIRONMENT

收录：;EI(收录号：20210709907750);WOS:【SCI-EXPANDED(收录号:WOS:000493313200009)】；

基金：This work was supported by NSFC for Creative Research Groups (21421004) and Distinguished Young Scholars (21325625), NSFC/China, Oriental Scholarship, Fundamental Research Funds for the Central Universities (WJ1416005 and WJ1315025), Scientific Committee of Shanghai (14ZR1409700 and 15XD1501400), Programme of Introducing Talents of Discipline to Universities (B16017), Science Foundation for the Excellent Youth Scholars of Hebei Education Department (Y2012017), and Science Foundation for Oversea Scholars of Hebei (C201400324).

语种：英文

外文关键词：Indoline dye; Cosensitization; Adsorption sequence; Charge recombination; Photovoltaic performances

摘要：Cosensitization based on two or multiple dyes as "dye cocktails" can hit the target on compensating and broadening light-harvesting region. Two indoline D-A-pi-A motif sensitizers (WS-2 and WS-39) that possess similar light response area but distinctly reversed feature in photovoltaic performance are selected as the specific cosensitization couple. That is, WS-2 shows quite high photocurrent but low photovoltage, and WS-39 gives relatively low photocurrent but quite high photovoltage. Due to the obvious "barrel effect", both dyes show medium PCE around 8.50%. In contrast with the previous cosensitization strategy mostly focused on the compensation of light response region, herein we perform different cosensitization sequence, for taking insight into the balance of photocurrent and photovoltage, and achieving the synergistic improvement in power conversion efficiency (PCE). Electronic impedance spectra (EIS) indicate that exploiting dye WS-39 with high V-OC value as the primary sensitizer can repress the charge recombination more effectively, resulting in superior V-OC rather than using dye WS-2 with high J(SC) as the primary sensitizer. As a consequence, a high PCE value of 9.48% is obtained with the delicate cosensitization using WS-39 as primary dye and WS-2 as accessory dye, which is higher than the corresponding devices sensitized by each individual dye (around 8.48-8.67%). It provides an effective optimizing strategy of cosensitization how to combine the individual dye advantages for developing highly efficient solar cells. (C) 2016, Institute of Process Engineering, Chinese Academy of Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.