Employing inorganic/organic hybrid interface layer to improve electron transfer for inverted polymer solar cells. (20th August 2016)

• Record Type: Journal Article
• Authors: Li, Zhiqi; Zhang, Xinyuan; Li, Shujun; Liu, Chunyu; Zhang, Zhihui; Li, Jinfeng; Shen, Liang; Guo, Wenbin; Ruan, Shengping
• Is Part Of: Electrochimica acta. Volume 210(2016)
• Page Start: 874
• Page End: 879
• Publication Date: 2016-08-20
• Subjects: polymer solar cells -- charge transfer -- exciton dissociation -- work function -- morphology; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.06.022
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Highlights: Polymer capping layer was employed into PSCs to enhance device efficiency. The short-circuit current density and fill factor are enhanced while maintaining the open-circuit voltage, leading to a 27.2% increase of power conversion efficiency. Polymer capping layer can improve energy level match for PSCs. The electrical conductivity and electron mobility are improved. Abstract: The performance of inverted polymer solar cells (PSCs) was enhanced by introducing TiOx and poly(9, 9-dioctylfluorenyl-2, 7-diyl) (PFD) as a hybrid buffer layer. Surface morphology and work function measurement demonstrated that PFD interlayer eliminated the defects and traps from TiOx surface and acted as an efficient charge transport matrix, resulting in enhanced electron mobility and reduced interface resistance. Therefore, the employment of TiOx /PFD composite layer improved to extract electron from active layer to ITO electrode and dramatically increased device efficiency from 5.717% to 7.272%, accounting for a 27.2% increase. The achieved high device efficiency, low-cost materials, and solution processes of TiOx /PFD layer provide a promising candidate for realizing high performance photovoltaic devices.