Publication:
Solution Processed PbS Quantum Dot Tandem Solar Cells

dc.contributor.advisor Shujuan, Huang en_US
dc.contributor.advisor Robert, Patterson en_US
dc.contributor.advisor Gavin, Conibeer en_US
dc.contributor.author Gao, Yijun en_US
dc.date.accessioned 2022-03-15T08:28:07Z
dc.date.available 2022-03-15T08:28:07Z
dc.date.issued 2020 en_US
dc.description.abstract Colloidal quantum dot solar cells have drawn great attention in the past decade due to their easy synthesis, tunable bandgaps and low cost. However, the quantum dots’ low absorbance together with limits placed on the thickness of the absorbing layer due to poor transport properties is hindering the development of quantum dot solar cells. In this research, for further developing quantum dot solar cells, a tandem solar cell strategy was utilised to address the above problem. A tandem solar cell stacks materials with different bandgaps to more efficiently convert the energy of a wider range of photons to electricity for higher solar cell efficiency. This project developed high performance monolithic tandem solar cells based on PbS colloidal quantum dots. Firstly, single-junction colloidal quantum dot cells were optimised as the building blocks of the tandem cells. MgCl2 passivated ZnO-NP electron transporting layers were applied to improve single-junction colloidal quantum dot cells by increasing both fill factor FF and short circuit current Jsc. Significant efficiency improvement has been observed based on single-junction PbS solar cells. Secondly, an optical modelling tool was created for the first time to simulate tandem colloidal quantum dot solar cells. This model could offer exact simulation on photon absorbance and current generation in tandem cells’ functional layers. The model provided very instructive and quite essential guidance for designing the tandem cell structure and experimental works of fabricating quantum dot tandem cells. Thirdly, based on improved single-junction PbS solar cell and an established directive model, high performance tandem colloidal quantum dot solar cells were successfully fabricated with different interlayers of both Au and ITO. A graded band alignment employing both ZnO-doping and quantum dot size tuning has been applied to further improve tandem cell performance. Due to improved carriers extraction, this strategy successfully pushed the efficiency of a tandem quantum dot solar cell to be around 7%. en_US
dc.identifier.uri http://hdl.handle.net/1959.4/65287
dc.language English
dc.language.iso EN en_US
dc.publisher UNSW, Sydney en_US
dc.rights CC BY-NC-ND 3.0 en_US
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/3.0/au/ en_US
dc.subject.other Tandem en_US
dc.subject.other PbS en_US
dc.subject.other Quantum dot en_US
dc.subject.other Solar cell en_US
dc.subject.other Colloidal quantum dot en_US
dc.subject.other CQD en_US
dc.subject.other Solution processed en_US
dc.title Solution Processed PbS Quantum Dot Tandem Solar Cells en_US
dc.type Thesis en_US
dcterms.accessRights open access
dcterms.rightsHolder Gao, Yijun
dspace.entity.type Publication en_US
unsw.accessRights.uri https://purl.org/coar/access_right/c_abf2
unsw.date.embargo 2022-03-01 en_US
unsw.description.embargoNote Embargoed until 2022-03-01
unsw.identifier.doi https://doi.org/10.26190/unsworks/2083
unsw.relation.faculty Engineering
unsw.relation.originalPublicationAffiliation Gao, Yijun, Photovoltaics & Renewable Energy Engineering, Faculty of Engineering, UNSW en_US
unsw.relation.originalPublicationAffiliation Shujuan, Huang, Photovoltaics & Renewable Energy Engineering, Faculty of Engineering, UNSW en_US
unsw.relation.originalPublicationAffiliation Robert, Patterson, Photovoltaics & Renewable Energy Engineering, Faculty of Engineering, UNSW en_US
unsw.relation.originalPublicationAffiliation Gavin, Conibeer, Photovoltaics & Renewable Energy Engineering, Faculty of Engineering, UNSW en_US
unsw.relation.school School of Photovoltaic and Renewable Energy Engineering *
unsw.thesis.degreetype PhD Doctorate en_US
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