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Effective Panchromatic Sensitization of Electrochemical Solar Cells: Strategy and Organizational Rules for Spatial Separation of Complementary Light Harvesters on High-Area Photoelectrodes
- Effective Panchromatic Sensitization of Electrochemical Solar Cells: Strategy and Organizational Rules for Spatial Separation of Complementary Light Harvesters on High-Area Photoelectrodes
- Jeong, Nak Cheon; Son, Ho-Jin; Prasittichai, Chaiya; Lee, Chang Yeon; Jensen, Rebecca A.; Farha, Omar K.; Hupp, Joseph T.
- DGIST Authors
- Jeong, Nak Cheon
- Issue Date
- Journal of the American Chemical Society, 134(48), 19820-19827
- Article Type
- Absolute Position; Broad Spectral; Charge Transfer; Chemical Structure; Chromatophore; Chromophores; Co-Sensitization; Controlled Study; Conversion Efficiency; Density; Dye-Sensitized Solar Cell; Electrochemical Solar Cells; Electrochemistry; Electrode; Electron Collections; Fabrication Strategies; Higher Efficiency; Light; Microtechnology; Mixed Dyes; Photo-Anode; Photo-Anodes; Photo-Electrodes; Photocurrent Density; Photocurrents; Photovoltaic; Porphyrin; Porphyrins; Sensitization; Solar Cells; Spatial Isolation; Spatial Separation; Thickness; Titania; Titanium Dioxide; Two-Color; Versatile Methods
- 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.
- American Chemical Society
- Related Researcher
Jeong, Nak Cheon
NC(Nanoporous-materials Chemistry for Fundamental Science) Lab
Inorganic Chemistry; Metal-Organic Framework; Nanoporous Materials; Electron Transport;Ion Transport
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- Department of Emerging Materials ScienceNC(Nanoporous-materials Chemistry for Fundamental Science) Lab1. Journal Articles
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