Conductive nanowires coated with a semiconductive shell as the photoanode in dye-sensitised solar cells

Hill, Justin J.; Haller, Kelly; Ge, Wangyao; Banks, Nick; Ziegler, Kirk J.

doi:10.1504/ijnbm.2012.051693

Cited by 2 publications

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“…Nanowire-based photoanodes in DSSCs have been reported to enhance charge transport due to the presence of a radial electrical field within the nanowires . This radial electrical field helps to draw electrons away from the surface, thereby, reducing electron recombination processes. , Other studies have focused on modifying the electrolyte solution. Song et al added cyclodextrins to the electrolyte to form complexes with the triiodide ions that reduced electron recombination and increased DSSC efficiencies.…”

Section: Introductionmentioning

confidence: 99%

Comparing Electron Recombination via Interfacial Modifications in Dye-Sensitized Solar Cells

Chen

et al. 2014

ACS Appl. Mater. Interfaces

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Establishing a blocking layer between the interfaces of the photoanode is an effective approach to improve the performance of dye-sensitized solar cells (DSSCs). In this work, HfO2 blocking layers are deposited via atomic layer deposition (ALD) onto tin-doped indium oxide (ITO) and TiO2. In both cases, addition of the blocking layer increases cell efficiencies to greater than 7%. The improved performance for a HfO2 layer inserted between the ITO/TiO2 interface is associated with an energy barrier that reduces electron recombination. HfO2 blocking layers between the TiO2/dye interface show more complex behavior and are more sensitive to the number of ALD cycles. For thin blocking layers on TiO2, the improved device performance is attributed to the passivation of surface states in TiO2. A distinct transition in dark current and electron lifetime are observed after 4 ALD cycles. These changes to performance indicate thick HfO2 layers on TiO2 formed an energy barrier that significantly hinders cell performance.

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