Title :
Efficient Inverted Polymer Solar Cells Through Modified Electron Extraction Layer
Author :
Wenzhan Xu ; Lili Jiang ; Shengjian Liu ; Xiaowen Hu ; Fei Huang ; Xiong Gong ; Yong Cao
Author_Institution :
State Key Lab. of Luminescent Mater. & Devices, South China Univ. of Technol., Guangzhou, China
Abstract :
Reengineering the surface of the electron extraction layer (EEL) had been proven to be an effective and simple way to boost the efficiency of polymer solar cells (PSCs) with an inverted device structure. In this study, we report the enhanced efficiency of inverted PSCs by using a conjugated polyelectrolyte to reengineer the surface of sol-gel processed ZnO EEL. It is found that more than 22% enhancement in efficiency is observed from the inverted PSCs with ZnO EEL reengineered by conjugated polyelectrolyte, as compared with the inverted PSCs with ZnO EEL. The enhanced efficiency is originated from decreased series resistance, smooth surface roughness, and decreased work function of ZnO thin layer modified by conjugated polyelectrolyte. Our findings provide a simple approach to boost the efficiency of the inverted PSCs.
Keywords :
II-VI semiconductors; electrical resistivity; polymer electrolytes; semiconductor thin films; sol-gel processing; solar cells; surface roughness; wide band gap semiconductors; work function; zinc compounds; ZnO; conjugated polyelectrolyte; inverted polymer solar cells; series resistance; smooth surface roughness; sol-gel processed ZnO electron extraction layer; work function; Photovoltaic cells; Photovoltaic systems; Polymers; Rough surfaces; Zinc oxide; Electron extraction layer (EEL); polymer solar cells (PSCs); power conversion efficiency (PCE);
Journal_Title :
Photovoltaics, IEEE Journal of
DOI :
10.1109/JPHOTOV.2015.2414512
