High-Permittivity Conjugated Polyelectrolyte Interlayers for High-Performance Bulk Heterojunction Organic Solar Cells
详细信息 查看全文
- 作者：Jurgen Kesters ; Sanne Govaerts ; Geert Pirotte ; Jeroen Drijkoningen ; Michèle Chevrier ; Niko Van den Brande ; Xianjie Liu ; Mats Fahlman ; Bruno Van Mele ; Laurence Lutsen ; Dirk Vanderzande ; Jean Manca ; Sébastien Clément ; Elizabeth Von Hauff ; Wouter Maes
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2016
- 出版时间：March 16, 2016
- 年：2016
- 卷：8
- 期：10
- 页码：6309-6314
- 全文大小：320K
- ISSN：1944-8252
文摘
Conjugated polyelectrolyte (CPE) interfacial layers present a powerful way to boost the I–V characteristics of organic photovoltaics. Nevertheless, clear guidelines with respect to the structure of high-performance interlayers are still lacking. In this work, impedance spectroscopy is applied to probe the dielectric permittivity of a series of polythiophene-based CPEs. The presence of ionic pendant groups grants the formation of a capacitive double layer, boosting the charge extraction and device efficiency. A counteracting effect is the diminishing affinity with the underlying photoactive layer. To balance these two effects, we found copolymer structures containing nonionic side chains to be beneficial.