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Title: Spectroscopic detection of halogen bonding resolves dye regeneration in the dye-sensitized solar cell

Journal Article · · Nature Communications
 [1];  [2];  [2];  [2];  [3];  [3]; ORCiD logo [2]; ORCiD logo [4]
  1. Univ. of British Columbia, Vancouver, BC (Canada). Dept. of Chemistry and Stewart Blusson Quantum Matter Inst.
  2. Univ. of British Columbia, Vancouver, BC (Canada). Dept. of Chemistry
  3. Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Chemistry
  4. Univ. of British Columbia, Vancouver, BC (Canada). Dept. of Chemistry, Stewart Blusson Quantum Matter Inst. and Dept. of Chemical and Biological Engineering

The interactions between a surface-adsorbed dye and a soluble redox-active electrolyte species in the dye-sensitized solar cell has a significant impact on the rate of regeneration of photo-oxidized dye molecules and open-circuit voltage of the device. Dyes must therefore be designed to encourage these interfacial interactions, but experimentally resolving how such weak interactions affect electron transfer is challenging. Herein, we use X-ray absorption spectroscopy to confirm halogen bonding can exist at the dye-electrolyte interface. Using a known series of triphenylamine-based dyes bearing halogen substituents geometrically positioned for reaction with halides in solution, halogen bonding was detected only in cases where brominated and iodinated dyes were photo-oxidized. This result implies that weak intermolecular interactions between photo-oxidized dyes and the electrolyte can impact device photovoltages. This result was unexpected considering the low concentration of oxidized dyes (less than 1 in 100,000) under full solar illumination.

Research Organization:
University of North Carolina, Chapel Hill, NC (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division
Grant/Contract Number:
SC0013461
OSTI ID:
1523468
Journal Information:
Nature Communications, Vol. 8, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 33 works
Citation information provided by
Web of Science

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Cited By (2)

Nanoarchitectures in dye-sensitized solar cells: metal oxides, oxide perovskites and carbon-based materials journal January 2018
Halogen-Bond Assisted Photoinduced Electron Transfer journal November 2019

Figures / Tables (6)


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