High reduction of interfacial charge recombination in colloidal quantum dot solar cells by metal oxide surface passivation
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Other documents of the author: Chang, Jin; Kuga, Yuki; Mora-Sero, Ivan; toyoda, taro; Ogomi, Yuhei; Hayase, Shuzi; Bisquert, Juan; Shen, Qing
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Show full item recordcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/2507
comunitat-uji-handle3:10234/6973
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http://dx.doi.org/10.1039/C4NR07521H |
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Title
High reduction of interfacial charge recombination in colloidal quantum dot solar cells by metal oxide surface passivationAuthor (s)
Date
2015Publisher
The Royal Society of ChemistryISSN
2040-3364; 2040-3372Bibliographic citation
CHANG, Jin, et al. High reduction of interfacial charge recombination in colloidal quantum dot solar cells by metal oxide surface passivation. Nanoscale, 2015, vol. 7, no 12, p. 5446-5456.Type
info:eu-repo/semantics/articlePublisher version
http://pubs.rsc.org/en/content/articlehtml/2015/nr/c4nr07521hVersion
info:eu-repo/semantics/publishedVersionSubject
Abstract
Bulk heterojunction (BHJ) solar cells based on colloidal QDs and metal oxide nanowires (NWs) possess unique and outstanding advantages in enhancing light harvesting and charge collection in comparison to planar ... [+]
Bulk heterojunction (BHJ) solar cells based on colloidal QDs and metal oxide nanowires (NWs) possess unique and outstanding advantages in enhancing light harvesting and charge collection in comparison to planar architectures. However, the high surface area of the NW structure often brings about a large amount of recombination (especially interfacial recombination) and limits the open-circuit voltage in BHJ solar cells. This problem is solved here by passivating the surface of the metal oxide component in PbS colloidal quantum dot solar cells (CQDSCs). By coating thin TiO2 layers onto ZnO-NW surfaces, the open-circuit voltage and power conversion efficiency have been improved by over 40% in PbS CQDSCs. Characterization by transient photovoltage decay and impedance spectroscopy indicated that the interfacial recombination was significantly reduced by the surface passivation strategy. An efficiency as high as 6.13% was achieved through the passivation approach and optimization for the length of the ZnO-NW arrays (device active area: 16 mm2). All solar cells were tested in air, and exhibited excellent air storage stability (without any performance decline over more than 130 days). This work highlights the significance of metal oxide passivation in achieving high performance BHJ solar cells. The charge recombination mechanism uncovered in this work could shed light on the further improvement of PbS CQDSCs and/or other types of solar cells. [-]
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Nanoscale, 2015, vol. 7, no 12Rights
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