One-pot synthesis of hierarchical mesoporous SnO2 spheres using a graft copolymer: Enhanced photovoltaic and photocatalytic performance

Jung Tae Park, Chang Soo Lee, Jong Hak Kim

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

We synthesized hierarchical mesoporous SnO2 (HM-SnO2) spheres with a large surface area (85.3 m2 g-1) via a one-pot controlled solvothermal process using tin chloride pentahydrate and graft copolymer, i.e., poly(vinyl chloride)-g-poly(oxyethylene methacrylate) (PVC-g-POEM) as a Sn precursor and structure directing agent, respectively. Solid-state dye-sensitized solar cells (ssDSSCs) fabricated with HM-SnO 2 spheres on an organized mesoporous SnO2 interfacial (om-SnO2 IF) layer as the photoanode had a long-term stable efficiency of 3.4% at 100 mW cm2, which was much higher than that of ssDSSCs with a photoanode comprising nonporous SnO2 (NP-SnO 2) spheres (1.9%). We attributed the enhanced device performance of ssDSSCs fabricated with the HM-SnO2 photoanode to the well-organized hierarchical structure with dual pores (23.5 and 162.3 nm), which provided a larger surface area, improved light scattering, and decreased charge recombination compared to the nonporous SnO2 (NP-SnO2) photoanode. We confirmed this by reflectance, incident photon to current conversion efficiency (IPCE), and intensity modulated photocurrent/voltage spectroscopy (IMPS/IMVS) measurements. Introduction of an om-SnO2 IF layer between the HM-SnO2 spheres and fluorine-doped tin oxide (FTO) substrate enhanced light harvesting, increased electron transport, reduced charge recombination, and decreased interfacial/internal resistance. Photocatalytic tests indicated that HM-SnO2 spheres showed high activity with good recyclability for photodegradation of methyl orange under UV light irradiation. This journal is

Original languageEnglish
Pages (from-to)31452-31461
Number of pages10
JournalRSC Advances
Volume4
Issue number59
DOIs
Publication statusPublished - 2014

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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