Formation of nanostructured fullerene interlayer through accelerated self-assembly and cross-linking of trichlorosilane moieties leading to enhanced efficiency of photovoltaic cells

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

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

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 TiOx 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/TiOx/PDITTDTBT:PC 71BM(1:4, w/w)/MoOx/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.

Original languageEnglish
Pages (from-to)4781-4789
Number of pages9
JournalMacromolecules
Volume46
Issue number12
DOIs
Publication statusPublished - Jun 25 2013
Externally publishedYes

ASJC Scopus subject areas

  • Organic Chemistry
  • Materials Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry

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