Platinum (II)-bis (aryleneethynylene) complexes for solution-processible molecular bulk heterojunction solar cells

Feng Rong Dai, Hong Mei Zhan, Qian Liu, Ying Ying Fu, Jin Hua Li, Qi Wei Wang, Zhiyuan Xie, Lixiang Wang, Feng Yan, Wai Yeung Wong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

81 Citations (Scopus)

Abstract

Four new solution-processible small-molecular platinum(II)-bis( aryleneethynylene) complexes consisting of benzothiadiazole as the electron acceptor and triphenylamine and/ or thiophene as the electron donor were conveniently synthesized and characterized by physicochemical and computational methods, and utilized as the electron-donor materials in the fabrication of solution-processed bulk heterojunction (BHJ) solar cells. The effect of different electron-donor groups in these small molecules on the optoelectronic and photovoltaic properties was also examined. The optical and time-dependent density functional theory studies showed that the incorporation of stronger electron-donor groups significantly enhanced the solarabsorption abilities of the complexes. These molecular complexes can serve as good electron donors for fabricating BHJ devices by blending them with the [6,6]-phenyl-C71-butyric acid methyl ester (PC70BM) as the electron acceptor. The best power conversion efficiency of 2.37% was achieved with the open-circuit voltage of 0.83 V, short-circuit current density of 7.10 mAcm-2and fill factor of 0.40 under illumination of an AM 1.5 solar-cell simulator. The spin-coated thin films showed pchannel field-effect charge transport with hole mobilities of up to 2.4× 10-4cm2V-1s-1for these molecules. The present work illuminates the potential of well-defined organometallic complexes in developing light-harvesting small molecules for efficient power generation in organic photovoltaics implementation. KGaA, Weinheim.
Original languageEnglish
Pages (from-to)1502-1511
Number of pages10
JournalChemistry - A European Journal
Volume18
Issue number5
DOIs
Publication statusPublished - 27 Jan 2012

Keywords

  • Organic photovoltaics
  • Organic solar cells
  • Platinum
  • Solution processing
  • Synthetic methods
  • Voltammetry

ASJC Scopus subject areas

  • Chemistry(all)

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