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Updated: Mar 24, 2026
Printing Fabrication of Bulk Heterojunction Solar Cells and In Situ Morphology Characterization
Published on: January 29, 2017
Enhanced Electron Extraction Capability of Polymer Solar Cells via Employing Electrostatically Self-Assembled
Zhiqi Li1, Xinyuan Zhang1, Chunyu Liu1
1State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , 2699 Qianjin Street, Changchun 130012, People's Republic of China.
Abstract:
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.
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