文献类型：期刊文献

英文题名：Performance enhancement of quantum dot sensitized solar cells by adding electrolyte additives

作者：Du, Jun[1];Meng, Xinxin[1];Zhao, Ke[1];Li, Yan[1];Zhong, Xinhua[1]

机构：[1]E China Univ Sci & Technol, Inst Appl Chem, Key Lab Adv Mat, Shanghai 200237, Peoples R China

年份：2015

卷号：3

期号：33

起止页码：17091

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20153301170489);WOS:【SCI-EXPANDED(收录号:WOS:000359459900021)】；

基金：We acknowledge the National Natural Science Foundation of China (No. 21421004, 91433106, 21175043, and 21301059), the Science and Technology Commission of Shanghai Municipality (11JC1403100 and 12NM0504101), and the Fundamental Research Funds for the Central Universities in China for financial support.

语种：英文

外文关键词：Additives - Solar cells - Open circuit voltage - Polysulfides - Redox reactions - II-VI semiconductors - Titanium dioxide - Nanocrystals - Cadmium compounds - Polyelectrolytes - Semiconductor quantum dots

摘要：Besides the relatively high redox potential of the adopted S2-/S-n(2-) polysulfide redox couple electrolyte, the parasitic charge recombination process is another significant factor that limits the open-circuit voltage and consequent power conversion efficiency (PCE) of quantum dot sensitized solar cells (QDSCs). Herein, we report a facile method to modify the polysulfide electrolyte with the addition of polyethylene glycol (PEG) additives to suppress the charge recombination occurring at the TiO2/QDs/electrolyte interfaces. Impedance spectroscopy and open circuit voltage decay (OCVD) measurements reveal that the PEG additive in the polysulfide electrolyte reduces interfacial recombination when compared with the conventional polysulfide electrolyte in the absence of the PEG additive. A dramatic enhancement of PCE from 5.80% to 6.74% was observed with the introduction of 15 wt% PEG in the polysulfide electrolyte in CdSe based QDSCs. Moreover, the PEG additive also improves the photovoltaic performance stability of the resultant cells.