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FTO-free top-illuminated colloidal quantum dot electro-optics in devices
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.ORCID iD: 0000-0001-6589-3514
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.ORCID iD: 0000-0003-2046-1229
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.
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2017 (English)In: Solar Energy, ISSN 0038-092X, E-ISSN 1471-1257, Vol. 158, p. 533-542Article in journal (Refereed) Published
Abstract [en]

A solar cell device architecture with top-illumination, where the light does not pass through the substrate, is advantageous for many applications. It is also specifically useful for the construction of tandem or multiple junction photovoltaic devices, with illumination through the top solar cell. Here, a top-illuminated colloidal quantum dot solar cell (TI-CQDSC) is demonstrated and compared with a conventional colloidal quantum dot solar cell (C-CQDSC) constructed on a FTO (fluorine doped tin oxide) glass substrate both theoretically and experimentally. The optical electric field distribution in the solar cells with different configuration is simulated using transfer matrix formalism and a more intense optical electric field was observed in TI-CQDSC, leading to a higher exciton generation rate within the colloidal quantum dot solid. The TI-CQDSCs are constructed on both nonconductive glass and flexible substrates, and a maximum power conversion efficiency of 6.4% and 5.6% is achieved, respectively, comparing to that of 5.9% for the C-CQDSC. The improved performance of the top illuminated solar cell is attributed to a combination of enhanced optical electric field intensity in the colloidal quantum dot solid and superior conductivity of the transparent metal film electrode.

Place, publisher, year, edition, pages
2017. Vol. 158, p. 533-542
Keywords [en]
Colloidal quantum dots, Top illuminated solar cell, Optical electric field, Exciton generation, Transparent metal film
National Category
Physical Sciences Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-340318DOI: 10.1016/j.solener.2017.10.018ISI: 000418974500051OAI: oai:DiVA.org:uu-340318DiVA, id: diva2:1181304
Available from: 2018-02-08 Created: 2018-02-08 Last updated: 2018-02-12Bibliographically approved

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Zhang, XiaoliangHägglund, CarlJohansson, Malin BSveinbjörnsson, KáriJohansson, Erik

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