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Probing and Controlling Surface Passivation of PbS Quantum Dot Solid for Improved Performance of Infrared Absorbing Solar Cells
Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Applied Physical Chemistry.
Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China..
Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China..
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2019 (English)In: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 31, no 11, p. 4081-4091Article in journal (Refereed) Published
Abstract [en]

Surface properties of colloidal quantum dots (CQDs) are critical for the transportation and recombination of the photoinduced charge carrier in CQD solar cells, therefore dominating the photovoltaic performance. Herein, PbS CQD passivated using liquid-state ligand exchange (LSLX) and solid-state ligand exchange (SSLX) strategies are in detail investigated using photoelectron spectroscopy (PES), and solar cell devices are prepared to understand the link between the CQD surface properties and the solar cell function. PES using different energies in the soft and hard Xray regime is applied to study the surface and bulk properties of the CQDs, and the results show more effective surface passivation of the CQDs prepared with the LSLX strategy and less formation of lead-oxide. The CQD solar cells prepared with LSLX strategy show higher performance, and the photoelectric measurements suggest that the recombination of photoinduced charges is reduced for the solar cell prepared with the LSLX approach. Meanwhile, the fabricated solar cells exhibit good stability. This work provides important insights into how to fine-tune the CQD surface properties by improving the CQD passivation, and how this is linked to further improvements of the device photovoltaic performance.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019. Vol. 31, no 11, p. 4081-4091
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-254499DOI: 10.1021/acs.chemmater.9b00742ISI: 000471728200026Scopus ID: 2-s2.0-85067114703OAI: oai:DiVA.org:kth-254499DiVA, id: diva2:1337742
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QC 20190715

Available from: 2019-07-16 Created: 2019-07-16 Last updated: 2019-07-29Bibliographically approved

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