Enhanced Electron Extraction Capability of Polymer Solar Cells via Employing Electrostatically Self-Assembled Molecule on Cathode Interfacial Layer

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• 作者：Zhiqi Li ; Xinyuan Zhang ; Chunyu Liu ; Zhihui Zhang ; Jinfeng Li ; Liang Shen ; Wenbin Guo ; Shengping Ruan
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：March 30, 2016
• 年：2016
• 卷：8
• 期：12
• 页码：8224-8231
• 全文大小：535K
• ISSN：1944-8252

文摘

In this paper, high-performance inverted polymer solar cells (PSCs) with a modified cathode buffer layer, titanium dioxide:polyethylenimine (TiO₂:PEI), are demonstrated. The TiO₂-O-PEI transport layer was fabricated by electrostatically self-assembled monolayers (ESAM) of PEI molecules. Protonated amine functional groups of PEI can combine protons (H⁺) hydrolyzing from its aqueous solution. Also, PEI could produce ESAM on the surface of hydroxylated TiO₂ because of its cationic characteristics. The incorporation of the TiO₂-O-PEI layer enhances the photocurrent and power conversion efficiency (PCE) due to the improved interfacial electron transport and extraction of the TiO₂-O-PEI surface and the increased light absorption of the active layer. The enhanced PCE, low-cost materials, and solution process of TiO₂-O-PEI buffer layers provide a promising method for highly efficient PSCs.