文献类型：期刊文献

英文题名：Enhanced Photocurrent Density by Spin-Coated NiO Photocathodes for N-Annulated Perylene-Based p-Type Dye-Sensitized Solar Cells

作者：Li, Xing[1];Yu, Fengtao[1];Stappert, Sebastian[2];Li, Chen[2];Zhou, Ying[1];Yu, Ying[1];Li, Xin[3];Agren, Hans[3];Hua, Jianli[1];Tian, He[1]

机构：[1]East China Univ Sci & Technol, Inst Fine Chem, Sch Chem & Mol Engn, Key Lab Adv Mat, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Max Planck Inst Polymer Res, Ackermannweg 10, D-55128 Mainz, Germany;[3]KTH Royal Inst Technol, Sch Biotechnol, Div Theoret Chem & Biol, SE-10691 Stockholm, Sweden

年份：2016

卷号：8

期号：30

起止页码：19393

外文期刊名：ACS APPLIED MATERIALS & INTERFACES

收录：;EI(收录号：20163202697002);WOS:【SCI-EXPANDED(收录号:WOS:000380968300025)】；

基金：For financial support of this research, we thank the Science Fund for Creative Research Groups (21421004) and NSFC/China (21172073, 21372082, 2116110444 and 91233207). X.L. and H.A. acknowledge computational resources provided by the Swedish National Infrastructure for Computing (SNIC 2014/11-31).

语种：英文

外文关键词：p-type dye-sensitized solar cells; spin-coated NiO photocathode; N-annulated perylene; quinoxaline; organic sensitizer

摘要：The low photocurrent density of p-type dye sensitized solar cells (p-DSSCs) has limited the development of high-efficiency tandem cells due to the inadequate light harvesting ability of sensitizers and the low hole mobility of semiconductors. Hereby, two new "push-pull" type organic dyes (PQ-1 and PQ-2) containing N-annulated perylene as electron donor have been synthesized, where the PQ-2-based p-DSSCs show higher photoelectric conversion efficiency (PCE) of 0.316% owing to the higher molar extinction compared to of that PQ-1. Additionally, the photocurrent densities were remarkably increased from 2.20 to 5.85 mA cm(-2) for PQ-1 and 2.45 to 6.69 mA cm(-2) for PQ-2 by spin coated NiO photocathode based-p-DSSCs, respectively. This results are ascribed to the enhancement of hole transport rate, dye loading amounts and transparency of NiO films in comparison to that prepared by screen-printing method. Electrochemical impedance spectroscopy and theoretical calculations studies indicate that the molecular dipole moment approaching closer to the NiO surface shifts the quasi-Fermi level to more positive levels, improving,open-circuit voltage (V-oc). Intensity-modulated photocurrent spectroscopy illustrates that the hole transit time in NiO films prepared in spin-coating is shorter than that prepared by screen-printing method.