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Post-Assembly Atomic Layer Deposition of Ultrathin Metal-Oxide Coatings Enhances the Performance of an Organic Dye-Sensitized Solar Cell by Suppressing Dye Aggregation

Title
Post-Assembly Atomic Layer Deposition of Ultrathin Metal-Oxide Coatings Enhances the Performance of an Organic Dye-Sensitized Solar Cell by Suppressing Dye Aggregation
Authors
Son, Ho-JinKim, Chul HoonKim, Dong WookJeong, Nak CheonPrasittichai, ChaiyaLuo, LangliWu, JinsongFarha, Omar K.Wasielewski, Michael R.Hupp, Joseph T.
DGIST Authors
Jeong, Nak Cheon
Issue Date
2015-03
Citation
ACS Applied Materials and Interfaces, 7(9), 5150-5159
Type
Article
Article Type
Article
Keywords
Atomic Layer DepositionAtomic Layer Deposition (ALD)AtomsChenodeoxycholic AcidConcomitant ReductionConversion EfficiencyDepositionDye-Sensitized Solar Cells (DSCs)Dye AggregationElectron InjectionEnergy ConversionExcited State LifetimesExcited StatesInterfacial Electron InjectionLight to Electrical Energy ConversionPost-TreatmentProtective CoatingsSignificant MechanismSolar CellsTitanium DioxideUltra-Fast Spectroscopies
ISSN
1944-8244
Abstract
Dye aggregation and concomitant reduction of dye excited-state lifetimes and electron-injection yields constitute a significant mechanism for diminution of light-to-electrical energy conversion efficiencies in many dye-sensitized solar cells (DSCs). For TiO2-based DSCs prepared with an archetypal donor-acceptor organic dye, (E)-2-cyano-3-(5′-(5′′-(p-(diphenylamino)phenyl)-thiophen-2′′-yl)thiophen-2′-yl)acrylic acid (OrgD), we find, in part via ultrafast spectroscopy measurements, that postdye-adsorption atomic layer deposition (ALD) of ultrathin layers of either TiO2 or Al2O3 effectively reverses residual aggregation. Notably, the ALD treatment is significantly more effective than the widely used aggregation-inhibiting coadsorbent, chenodeoxycholic acid. Primarily because of reversal of OrgD aggregation, and resulting improved injection yields, ALD post-treatment engenders a 30+% increase in overall energy conversion efficiency. A secondary contributor to increased currents and efficiencies is an ALD-induced attenuation of the rate of interception of injected electrons, resulting in slightly more efficient charge collection. © 2015 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/2921
DOI
10.1021/am507405b
Publisher
American Chemical Society
Related Researcher
  • Author Jeong, Nak Cheon NC(Nanoporous-materials Chemistry for Fundamental Science) Lab
  • Research Interests Inorganic Chemistry; Metal-Organic Framework; Nanoporous Materials; Electron Transport;Ion Transport
Files:
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Collection:
Department of Emerging Materials ScienceNC(Nanoporous-materials Chemistry for Fundamental Science) Lab1. Journal Articles


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