Formation of Nanostructured Fullerene Interlayer through Accelerated Self-Assembly and Cross-Linking of Trichlorosilane Moieties Leading to Enhanced Efficiency of Photovoltaic Cells

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• 作者：Wei-Wei Liang ; Chih-Yu Chang ; Yu-Ying Lai ; Sheng-Wen Cheng ; Huan-Hsuan Chang ; Yin-Yu Lai ; Yen-Ju Cheng ; Chien-Lung Wang ; Chain-Shu Hsu
• 刊名：Macromolecules
• 出版年：2013
• 出版时间：June 25, 2013
• 年：2013
• 卷：46
• 期：12
• 页码：4781-4789
• 全文大小：642K
• 年卷期：v.46,no.12(June 25, 2013)
• ISSN：1520-5835

文摘

A new cross-linkable fullerene material, bis(2-(trichlorosilyl)propyl)-malonate C₆₀ (TSMC), functionalized with two trichlorosilane groups, was easily synthesized by Pt-catalyzed olefin hydrosilylation. By making use of facile hydrolysis of the trichlorosilyl moieties, TSMC can be spontaneously self-assembled and cross-linked on the TiO_x surface by a simple spin-coating processing without the aid of photoirradiation or post-thermal treatments. The rapid formation of self-assembled and cross-linked TSMC (SA-C-TSMC) effectively passivates the residual hydroxyl groups on the TiO_x surface. More significantly, the solvent-resistant TSMC network features a nanostructured surface to provide extra charge-generating interfacial area and straight electron transport pathways. The device (ITO/TiO_x/SA-C-TSMC/P3HT:PC₆₁BM (1:1, w/w)/PEDOT:PSS/Ag) with this C₆₀ interlayer exhibited an efficiency of 3.9% which greatly outperformed the device without this layer. Furthermore, the strategy can also be effectively applied to the device (ITO/TiO_x/PDITTDTBT:PC₇₁BM(1:4, w/w)/MoO_x/Ag) incorporating a conjugated polymer, poly(diindenothiophene-alt-dithienylbenzothiadizole) copolymer (PDITTDTBT). This device delivered a high efficiency of 5.8% which represents a 35% enhancement over the device without SA-C-TSMC. This new generation of trichlorosilane-based fullerene offers an easy and accelerated processing technique to produce efficient and cost-effective inverted solar cells.