Investigation of a Solution-Processable, Nonspecific Surface Modifier for Low Cost, High Work Function Electrodes

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• 作者：Allison C. Hinckley ; Congcong Wang ; Raphael Pfattner ; Desheng Kong ; Yan Zhou ; Ben Ecker ; Yongli Gao ; Zhenan Bao
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：August 3, 2016
• 年：2016
• 卷：8
• 期：30
• 页码：19658-19664
• 全文大小：456K
• 年卷期：0
• ISSN：1944-8252

文摘

We demonstrate the ability of the highly fluorinated, chemically inert copolymer poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) to significantly increase the work function of a variety of common electrode materials. The work function change is hypothesized to occur via physisorption of the polymer layer and formation of a surface dipole at the polymer/conductor interface. When incorporated into organic solar cells, an interlayer of PVDF-HFP at an Ag anode increases the open circuit voltage by 0.4 eV and improves device power conversion efficiency by approximately an order of magnitude relative to Ag alone. Solution-processable in air, PVDF-HFP thin films provide one possible route toward achieving low cost, nonreactive, high work function electrodes.