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postgraduate thesis: Investigation on the effect of ZnO nanoparticle properties on dye sensitized solar cell performance

TitleInvestigation on the effect of ZnO nanoparticle properties on dye sensitized solar cell performance
Authors
Advisors
Advisor(s):Djurisic, A
Issue Date2012
PublisherThe University of Hong Kong (Pokfulam, Hong Kong)
Citation
Wong, K. [黃嘉勤]. (2012). Investigation on the effect of ZnO nanoparticle properties on dye sensitized solar cell performance. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b4961824
AbstractZinc oxide (ZnO) is a wide band-gap semiconductor that is of interest for application in dye sensitized solar cells (DSSCs) because of similarity of its properties to TiO2. Unlike TiO2, ZnO can readily be grown in a wide variety of morphologies, using inexpensive, simple, and low temperature methods. Recent research on ZnO-based DSSCs focuses on modifying the ZnO layer morphology in order to maximize surface area, and enhance the electron collection by providing fast electron transport. It is expected that the improvement in cell performance by morphology modification is due to higher dye loading, increased electron lifetime and fast electron transport. However, ZnO properties may be affected by various synthesis methods. It is difficult to make a conclusion whether the change of performance are attributed to change of morphology or a change in the defect types and/ or defect concentrations. In this study, the influence of ZnO nanoparticle properties on cell performance has been investigated. Commercial ZnO nanoparticles with different sizes and optical properties were utilized. It was found that there is a complex relationship between native defects, dye loading, charge transport and photovoltaic performance. In particular, the presence of non-radiative defects was found to be detrimental to photovoltaic performance. In addition, with the similar defect emission intensities, sample exhibiting orange-red defect emission showed better performance than the samples emitting green defect emission. Nanoparticle properties and their relationship between dye adsorption, electron injection, electron lifetime and electron transport, and photovoltaic performance will be discussed.
DegreeMaster of Philosophy
SubjectZinc oxide - Optical properties.
Nanoparticles.
Dye-sensitized solar cells.
Dept/ProgramPhysics
Persistent Identifierhttp://hdl.handle.net/10722/181496

 

DC FieldValueLanguage
dc.contributor.advisorDjurisic, A-
dc.contributor.authorWong, Ka-kan.-
dc.contributor.author黃嘉勤.-
dc.date.accessioned2013-03-03T03:20:11Z-
dc.date.available2013-03-03T03:20:11Z-
dc.date.issued2012-
dc.identifier.citationWong, K. [黃嘉勤]. (2012). Investigation on the effect of ZnO nanoparticle properties on dye sensitized solar cell performance. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b4961824-
dc.identifier.urihttp://hdl.handle.net/10722/181496-
dc.description.abstractZinc oxide (ZnO) is a wide band-gap semiconductor that is of interest for application in dye sensitized solar cells (DSSCs) because of similarity of its properties to TiO2. Unlike TiO2, ZnO can readily be grown in a wide variety of morphologies, using inexpensive, simple, and low temperature methods. Recent research on ZnO-based DSSCs focuses on modifying the ZnO layer morphology in order to maximize surface area, and enhance the electron collection by providing fast electron transport. It is expected that the improvement in cell performance by morphology modification is due to higher dye loading, increased electron lifetime and fast electron transport. However, ZnO properties may be affected by various synthesis methods. It is difficult to make a conclusion whether the change of performance are attributed to change of morphology or a change in the defect types and/ or defect concentrations. In this study, the influence of ZnO nanoparticle properties on cell performance has been investigated. Commercial ZnO nanoparticles with different sizes and optical properties were utilized. It was found that there is a complex relationship between native defects, dye loading, charge transport and photovoltaic performance. In particular, the presence of non-radiative defects was found to be detrimental to photovoltaic performance. In addition, with the similar defect emission intensities, sample exhibiting orange-red defect emission showed better performance than the samples emitting green defect emission. Nanoparticle properties and their relationship between dye adsorption, electron injection, electron lifetime and electron transport, and photovoltaic performance will be discussed.-
dc.languageeng-
dc.publisherThe University of Hong Kong (Pokfulam, Hong Kong)-
dc.relation.ispartofHKU Theses Online (HKUTO)-
dc.rightsThe author retains all proprietary rights, (such as patent rights) and the right to use in future works.-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.source.urihttp://hub.hku.hk/bib/B49618246-
dc.subject.lcshZinc oxide - Optical properties.-
dc.subject.lcshNanoparticles.-
dc.subject.lcshDye-sensitized solar cells.-
dc.titleInvestigation on the effect of ZnO nanoparticle properties on dye sensitized solar cell performance-
dc.typePG_Thesis-
dc.identifier.hkulb4961824-
dc.description.thesisnameMaster of Philosophy-
dc.description.thesislevelMaster-
dc.description.thesisdisciplinePhysics-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.5353/th_b4961824-
dc.date.hkucongregation2013-

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