Cited 32 time in webofscience Cited 31 time in scopus

Effective Panchromatic Sensitization of Electrochemical Solar Cells: Strategy and Organizational Rules for Spatial Separation of Complementary Light Harvesters on High-Area Photoelectrodes

Title
Effective Panchromatic Sensitization of Electrochemical Solar Cells: Strategy and Organizational Rules for Spatial Separation of Complementary Light Harvesters on High-Area Photoelectrodes
Authors
Jeong, NC[Jeong, Nak Cheon]Son, HJ[Son, Ho-Jin]Prasittichai, C[Prasittichai, Chaiya]Lee, CY[Lee, Chang Yeon]Jensen, RA[Jensen, Rebecca A.]Farha, OK[Farha, Omar K.]Hupp, JT[Hupp, Joseph T.]
DGIST Authors
Jeong, NC[Jeong, Nak Cheon]
Issue Date
2012-12-05
Citation
Journal of the American Chemical Society, 134(48), 19820-19827
Type
Article
Article Type
Article
Keywords
Absolute PositionBroad SpectralCharge TransferChemical StructureChromatophoreChromophoresCo-SensitizationControlled StudyConversion EfficiencyDensityDye-Sensitized Solar CellElectrochemical Solar CellsElectrochemistryElectrodeElectron CollectionsFabrication StrategiesHigher EfficiencyLightMicrotechnologyMixed DyesPhoto-AnodePhoto-AnodesPhoto-ElectrodesPhotocurrent DensityPhotocurrentsPhotovoltaicPorphyrinPorphyrinsSensitizationSolar CellsSpatial IsolationSpatial SeparationThicknessTitaniaTitanium DioxideTwo-ColorVersatile Methods
ISSN
0002-7863
Abstract
Dye-sensitized solar cells, especially those comprising molecular chromophores and inorganic titania, have shown promise as an alternative to silicon for photovoltaic light-to-electrical energy conversion. Co-sensitization (the use of two or more chromophores having complementary absorption spectra) has attracted attention as a method for harvesting photons over a broad spectral range. If implemented successfully, then cosensitization can substantially enhance photocurrent densities and light-to-electrical energy conversion efficiencies. In only a few cases, however, have significant overall improvements been obtained. In most other cases, inefficiencies arise due to unconstructive energy or charge transfer between chromophores or, as we show here, because of modulation of charge-recombination behavior. Spatial isolation of differing chromophores offers a solution. We report a new and versatile method for fabricating two-color photoanodes featuring spatially isolated chromophore types that are selectively positioned in desired zones. Exploiting this methodology, we find that photocurrent densities depend on both the relative and absolute positions of chromophores and on "local" effective electron collection lengths. One version of the two-color photoanode, based on an organic push-pull dye together with a porphyrin dye, yielded high photocurrent densities (JSC = 14.6 mA cm-2) and double the efficiency of randomly mixed dyes, once the dyes were optimally positioned with respect to each other. We believe that the organizational rules and fabrication strategy will prove transferrable, thereby advancing understanding of panchromatic sensitization as well as yielding higher efficiency devices. © 2012 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/3310
DOI
10.1021/ja308725r
Publisher
American Chemical Society
Files:
There are no files associated with this item.
Collection:
Emerging Materials ScienceETC1. Journal Articles


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