DSSCs with ZnO commercial at TiO2 core - shell photoanodes and I- /I3 - electrolyte showing improved Voc

Modification of energy gradients and potential barriers with Cd and Mg ion dopants

Ako Rajour Tanyila, Piyasiri Ekanayake, Ai Ling Tan, David James Young, D. S.U. Peiris

Research output: Chapter in Book/Report/Conference proceedingConference Paper published in ProceedingsResearchpeer-review

Abstract

ZnO commercial at TiO2 core-shell nanostructures have been manipulated with metal ion dopants to create structures with reduced interfacial charge transfer recombination. ZnO and TiO2 were modified by doping with Cd and Mg, respectively, resulting in a reduction in the band-gap for Cd:ZnO and an increase in the band-gap for Mg:TiO2. A series of core-shell nanostructures based on a ZnO or a Cd:ZnO core and TiO2 or a Mg:TiO2 shell have been investigated as DSSC photoanodes. In another series, the core-shell materials were reversed for a complete evaluation of our hypothesis. The conduction band minima for the core and the shell structures were both extended. The structure of the nanoparticles, optoelectrical and interfacial charge recombination of of DSSC based on the nanoparticle films were characterized by XRD, SEM, TEM, UV-Vis DRS, Mott-Schottky, current density-voltage and EIS methods. The power conversion efficiencies (PCEs) of DSSCs based on these core-shell structures were observed to depend on the elevation of the conduction band minimum of the shell oxide relative to that of the core oxide. DSSCs with Cd:ZnO commercial at Mg:TiO2 and Cd:ZnO commercial at TiO2 photoanodes achieved Voc and FF values comparable to those of DSSCs with TiO2 anodes. A moderate energy gradient and high potential barrier in these core-shell structures resulted in longer effective electron lifetimes and lower electron recombination in the corresponding DSSCs. The low PCE registered for DSSCs with anodes of Cd:ZnO commercial at Mg:TiO2 and Cd:ZnO commercial at TiO2 were attributed to the presence of a high proportion of rutile phase, caused by sintering at 650°C.

Original languageEnglish
Title of host publicationPhotonic Networks and Devices, Networks 2016
PublisherOptical Society of America (OSA)
ISBN (Print)9781943580149
DOIs
Publication statusPublished - 21 Jul 2014
Externally publishedYes
EventPhotonic Networks and Devices, Networks 2016 - Vancouver, Canada
Duration: 18 Jul 201620 Jul 2016

Publication series

NameOptics InfoBase Conference Papers

Conference

ConferencePhotonic Networks and Devices, Networks 2016
CountryCanada
CityVancouver
Period18/07/1620/07/16

Fingerprint

Conduction bands
Oxides
Electrolytes
Conversion efficiency
Nanostructures
Anodes
Energy gap
Doping (additives)
Ions
Nanoparticles
Electrons
Metal ions
Charge transfer
Current density
Sintering
Transmission electron microscopy
Scanning electron microscopy
Electric potential
titanium dioxide

Cite this

Tanyila, A. R., Ekanayake, P., Tan, A. L., James Young, D., & Peiris, D. S. U. (2014). DSSCs with ZnO commercial at TiO2 core - shell photoanodes and I- /I3 - electrolyte showing improved Voc: Modification of energy gradients and potential barriers with Cd and Mg ion dopants. In Photonic Networks and Devices, Networks 2016 (Optics InfoBase Conference Papers). Optical Society of America (OSA). https://doi.org/10.1364/IPRSN.2016.JTu4A.39
Tanyila, Ako Rajour ; Ekanayake, Piyasiri ; Tan, Ai Ling ; James Young, David ; Peiris, D. S.U. / DSSCs with ZnO commercial at TiO2 core - shell photoanodes and I- /I3 - electrolyte showing improved Voc : Modification of energy gradients and potential barriers with Cd and Mg ion dopants. Photonic Networks and Devices, Networks 2016. Optical Society of America (OSA), 2014. (Optics InfoBase Conference Papers).
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Tanyila, AR, Ekanayake, P, Tan, AL, James Young, D & Peiris, DSU 2014, DSSCs with ZnO commercial at TiO2 core - shell photoanodes and I- /I3 - electrolyte showing improved Voc: Modification of energy gradients and potential barriers with Cd and Mg ion dopants. in Photonic Networks and Devices, Networks 2016. Optics InfoBase Conference Papers, Optical Society of America (OSA), Photonic Networks and Devices, Networks 2016, Vancouver, Canada, 18/07/16. https://doi.org/10.1364/IPRSN.2016.JTu4A.39

DSSCs with ZnO commercial at TiO2 core - shell photoanodes and I- /I3 - electrolyte showing improved Voc : Modification of energy gradients and potential barriers with Cd and Mg ion dopants. / Tanyila, Ako Rajour; Ekanayake, Piyasiri; Tan, Ai Ling; James Young, David; Peiris, D. S.U.

Photonic Networks and Devices, Networks 2016. Optical Society of America (OSA), 2014. (Optics InfoBase Conference Papers).

Research output: Chapter in Book/Report/Conference proceedingConference Paper published in ProceedingsResearchpeer-review

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Tanyila AR, Ekanayake P, Tan AL, James Young D, Peiris DSU. DSSCs with ZnO commercial at TiO2 core - shell photoanodes and I- /I3 - electrolyte showing improved Voc: Modification of energy gradients and potential barriers with Cd and Mg ion dopants. In Photonic Networks and Devices, Networks 2016. Optical Society of America (OSA). 2014. (Optics InfoBase Conference Papers). https://doi.org/10.1364/IPRSN.2016.JTu4A.39