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  Control of recombination pathways in TiO2 nanowire hybrid solar cells using Sn4+ dopants

Dorman, J. A., Weickert, J., Reindl, J. B., Putnik, M., Wisnet, A., Noebels, M., et al. (2014). Control of recombination pathways in TiO2 nanowire hybrid solar cells using Sn4+ dopants. SI, 118(30), 16672-16679. doi:10.1021/jp412650r.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-B93D-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-6E62-6
Genre: Journal Article

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 Creators:
Dorman, James A.1, Author              
Weickert, Jonas2, Author              
Reindl, Julian B.3, Author              
Putnik, Martin3, Author              
Wisnet, Andreas4, Author              
Noebels, Matthias3, Author              
Scheu, Christina5, Author              
Schmidt-Mende, Lukas2, Author              
Affiliations:
1Department of Physics, University of Konstanz, 78457 Konstanz, Germany , ou_persistent22              
2Department of Physics, University of Konstanz, Universitätsstraße 10, 78464 Konstanz, Germany, ou_persistent22              
3Department of Physics, University of Konstanz, Universitätsstr. 10, Konstanz D-78457, Germany, ou_persistent22              
4Department of Chemistry, Ludwig-Maximilians-Universität and Center for NanoScience (CeNS), Butenandtstraße 11, 81377 Munich, Germany, ou_persistent22              
5Department of Chemistry and Center for NanoScience (CeNS), Ludwig-Maximilians Universität München, Germany, ou_persistent22              

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Free keywords: ATOMIC LAYER DEPOSITION; ELECTRON-TRANSPORT; THIN-FILMS; EFFICIENCY; MOBILITY; SPECTROSCOPY; PERFORMANCE; NANOROD; SNO2Chemistry; Science & Technology - Other Topics; Materials Science;
 Abstract: Hybrid nanostructures have shown increasing potential as a replacement for Si solar cells due to the availability of low-cost material combinations. However, up to now, hybrid solar cells, where photon absorption occurs in a semiconducting polymer and charge separation occurs at a metal oxide-polymer interface, show limited efficiencies. One limitation is caused by a relative low charge carrier mobility in the metal oxide. Here we addressed this issue and describe the use of a Sn:TiO2 vertical bar TiO2, core shell nanowire array to increase the charge-carrier mobility in the core of the nanowires while decreasing the charge-carrier recombination at the metal oxide polymer interface due to fast electron extraction from this interface, driven by a cascaded conduction band energy from shell to core of the nanowires. These doped cores with an undoped shell structure resulted in impressive efficiency improvement in hybrid solar cells of 3396 over the reference TiO2-based device. Additionally, this device structure resulted in a 17% increase in recombination lifetimes based on both photovoltage decay measurements and impedance spectroscopy. Recombination mechanisms are proposed for the core and core shell systems to highlight the various effects of the Sn4+-doped TiO2 nanowire arrays. Doped core shell structures have the potential for application in the hybrid-type devices without the limitations that are seen with the current dual metal oxide structures due to the seamless interface of the metal oxide host for direct transport of the electrons into the highly mobile core material.

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Language(s): eng - English
 Dates: 2014-07-31
 Publication Status: Published in print
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: ISI: 000339930900046
DOI: 10.1021/jp412650r
 Degree: -

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Title: SI
Source Genre: Issue
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Publ. Info: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA : AMER CHEMICAL SOC
Pages: - Volume / Issue: 118 (30) Sequence Number: - Start / End Page: 16672 - 16679 Identifier: ISSN: 1932-7447

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Title: Journal of Physical Chemistry C
  Abbreviation : J. Phys. Chem. C
Source Genre: Journal
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Publ. Info: Washington DC : American Chemical Society
Pages: - Volume / Issue: 118 Sequence Number: - Start / End Page: - Identifier: ISSN: 1932-7447
CoNE: https://pure.mpg.de/cone/journals/resource/954926947766_2