Improved efficiency for bulk heterojunction hybrid solar cells by utilizing CdSe quantum dot - graphene nanocomposites
Abstract: We present a significant efficiency enhancement of hybrid bulk heterojunction solar cells by utilizing CdSe quantum dots attached to reduced graphene oxide (rGO) as the electron accepting phase, blended with the PCPDTBT polymer. The quantum dot attachment to rGO was achieved following a self-assembly approach, recently developed, using thiolated reduced graphene oxide (TrGO) to form a TrGO–CdSe nanocomposite. Therefore, we are able to obtain TrGO–CdSe quantum dot/PCPDTBT bulk-heterojunction hybrid solar cells with power conversion efficiencies of up to 4.2%, compared with up to 3% for CdSe quantum dot/PCPDTBT devices. The improvement is mainly due to an increase of the open-circuit voltage from 0.55 V to 0.72 V. We found evidence for a significant change in the heterojunction donor–acceptor blend nanomorphology, observable by a more vertical alignment of the TrGO-quantum dot nanocomposites in the z-direction and a different nanophase separation in the x–y direction compared to the quantum dot only containing device. Moreover, an improved charge extraction and trap state reduction were observed for TrGO containing hybrid solar cells
- Location
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Deutsche Nationalbibliothek Frankfurt am Main
- Extent
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Online-Ressource
- Language
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Englisch
- Notes
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Physical chemistry, chemical physics. 16, issue, 24 (2014), 12251-12260, DOI 10.1039/C4CP01566E, issn: 1439-7641
IN COPYRIGHT http://rightsstatements.org/page/InC/1.0 rs
- Classification
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Elektrotechnik, Elektronik
- Keyword
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Solartechnik
Nanokomposit
- Event
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Veröffentlichung
- (where)
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Freiburg
- (who)
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Universität
- (when)
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2014
- Creator
- Contributor
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Institut für Mikrosystemtechnik
Freiburger Materialforschungszentrum
Institut für Physikalische Chemie
Technische Fakultät
Fakultät für Chemie und Pharmazie
Albert-Ludwigs-Universität Freiburg
- DOI
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10.1039/C4CP01566E
- URN
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urn:nbn:de:bsz:25-freidok-123054
- Rights
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Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Last update
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15.08.2025, 7:33 AM CEST
Data provider
Deutsche Nationalbibliothek. If you have any questions about the object, please contact the data provider.
Associated
- Eck, Michael
- Pham, Chuyen Van
- Züfle, Simon David
- Seßler, Martin
- Erdem, Emre
- Weber, Stefan
- Krüger, Michael
- Institut für Mikrosystemtechnik
- Freiburger Materialforschungszentrum
- Institut für Physikalische Chemie
- Technische Fakultät
- Fakultät für Chemie und Pharmazie
- Albert-Ludwigs-Universität Freiburg
- Universität
Time of origin
- 2014