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Improved Performance of Colloidal CdSe Quantum Dot-Sensitized Solar Cells by Hybrid Passivation
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).ORCID iD: 0000-0003-4053-7147
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Number of Authors: 72014 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 6, no 21, p. 18808-18815Article in journal (Refereed) Published
Abstract [en]

A hybrid passivation strategy is employed to modify the surface of colloidal CdSe quantum dots (QDs) for quantum dot-sensitized solar cells (QDSCs), by using mercaptopropionic acid (MPA) and iodide anions through a ligand exchange reaction in solution. This is found to be an effective way to improve the performance of QDSCs based on colloidal QDs. The results show that MPA can increase the coverage of the QDs on TiO2 electrodes and facilitate the hole extraction from the photoxidized QDs, and simultaneously, that the iodide anions can remedy the surface defects of the CdSe QDs and thus reduce the recombination loss in the device. This hybrid passivation treatment leads to a significant enhancement of the power conversion efficiency of the QDSCs by 41%. Furthermore, an optimal ratio of iodide ions to MPA was determined for favorable hybrid passivation; results show that excessive iodine anions are detrimental to the loading of the QDs. This study demonstrates that the improvement in QDSC performance can be realized by using a combination of different functional ligands to passivate the QDs, and that ligand exchange in solution effective approach to introduce can be an different ligands.

Place, publisher, year, edition, pages
2014. Vol. 6, no 21, p. 18808-18815
Keywords [en]
quantum dot-sensitized solar cells, colloidal quantum dots, hybrid passivation, solution process
National Category
Nano Technology Materials Engineering
Identifiers
URN: urn:nbn:se:su:diva-160576DOI: 10.1021/am504536aISI: 000344978200057PubMedID: 25310596OAI: oai:DiVA.org:su-160576DiVA, id: diva2:1254841
Available from: 2018-10-10 Created: 2018-10-10 Last updated: 2018-10-10Bibliographically approved

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