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Thienopyrroledione-Based Photosensitizers as Strong Photoinduced Oxidants: Oxidation of Fe(bpy)32+ in a >1.3 V Dye-Sensitized Solar Cell

Journal Article · · ACS Applied Energy Materials
 [1];  [2];  [2];  [2];  [2]
  1. Univ. of Mississippi, Oxford, MS (United States); University of Mississippi
  2. Univ. of Mississippi, Oxford, MS (United States)
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The creation of visible light absorbing organic dyes as strong photoinduced oxidants is needed for many potential applications in energy production and storage. In order to access more positive potentials, the electron deficient thienopyrroledione building block is promising as a π-bridge combined with weak aryl-ether donor groups and the phenyl-cyanoacetic acid acceptor group. The thienopyrroledione (TPD) building block is compared to the ubiquitous benzothiadiazole (BTD) building block which was recently used in a dye-sensitized solar cell (DSC) device with >1.4 V photovoltage output. The variation in dye donor group is studied through UV-Vis absorption spectroscopy and electrochemical methods both in solution and on TiO2 films. The TPD building block resulted in a more positive ground state and excited state oxidation potential, a higher photocurrent (up to 3.5 mA/cm2), and a higher power conversion efficiency (up to 2.9%) than a BTD analogue while retaining comparable photovoltages (~1.3 V versus ~1.4 V). Computational analysis was used to better understand the optical properties of the thienopyrroledione-based dyes showing overlap of orbitals at the TPD bridge in the S0 and S1 states. The dyes were analyzed in high voltage-DSC devices with a challenging to oxidize redox shuttle, [Fe(bpy)3]2+, at 1.37 V versus NHE.

Research Organization:
Univ. of Mississippi, Oxford, MS (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Grant/Contract Number:
SC0019131
OSTI ID:
1596578
Journal Information:
ACS Applied Energy Materials, Journal Name: ACS Applied Energy Materials Journal Issue: 8 Vol. 2; ISSN 2574-0962
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

25 ENERGY STORAGE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
dye-sensitized solar cells
high voltage solar cells
organic sensitizer
photoinduced oxidant
thienopyrroledione sensitizer