文献类型：期刊文献

英文题名：Graphene hydrogel-based counter electrode for high efficiency quantum dot-sensitized solar cells

作者：Zhang, Hua[1];Yang, Cheng[1];Du, Zhonglin[1];Pan, Dengyu[2];Zhong, Xinhua[3]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[2]Shanghai Univ, Inst Nanochem & Nanobiol, Shanghai 200444, Peoples R China;[3]South China Agr Univ, Coll Mat & Energy, 483 Wushan Rd, Guangzhou 510642, Guangdong, Peoples R China

年份：2017

卷号：5

期号：4

起止页码：1614

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20170503294761);WOS:【SCI-EXPANDED(收录号:WOS:000395072800034)】；

基金：We acknowledge the National Natural Science Foundation of China (No. 91233102, 21421004), the Programme of Introducing Talents of Discipline to Universities (B16017), and the Fundamental Research Funds for the Central Universities for the financial support (No. 222201313005).

语种：英文

外文关键词：Electric resistance - Graphene - Quantum efficiency - Semiconductor quantum dots - Sulfur compounds - Electrodes - Catalyst activity - Selenium compounds - Solar cells - Solar power generation - Cadmium compounds - Hydrogels - Nanocrystals

摘要：Although copper sulfide and/or carbon materials have been utilized in counter electrodes (CEs) due to their good catalytic activity and conductivity, the efficiency of the assembled quantum dot-sensitized solar cells (QDSCs) is still unsatisfactory because of the relatively low photovoltage (V-oc), which is commonly less than 0.7 V. In this study, graphene hydrogels (GHs) compressed onto titanium mesh served as the CE and the assembled CdSeTe QDSCs exhibited a photovoltaic conversion efficiency (PCE) of 9.85% and a V-oc as high as 0.756 V, which increased by 19.0% and 14.9%, respectively, and are higher than those of the conventional CuS on FTO. By incorporating CuS nanoparticles into GH during gelation, the as-prepared GH-CuS CEs show further improved performance and the maximum PCE and V-oc obtained were 10.71% and 0.786 V, respectively. The fill factor of the cells was also continuously increased. The excellent performance of the devices could be attributed to the synergistic effects of the water-rich GH (having a 3D porous structure accompanied by good conductivity) and highly catalytic CuS, reflected from the small series resistance, high catalytic activity, small electron transfer resistance, and stability, which have been confirmed by EIS, Tafel polarization, and CV curves.