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
Deutsche Nationalbibliothek Frankfurt am Main
Extent
Online-Ressource
Language
Englisch
Notes
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
Elektrotechnik, Elektronik
Keyword
Solartechnik
Nanokomposit

Event
Veröffentlichung
(where)
Freiburg
(who)
Universität
(when)
2014
Creator
Contributor
Institut für Mikrosystemtechnik
Freiburger Materialforschungszentrum
Institut für Physikalische Chemie
Technische Fakultät
Fakultät für Chemie und Pharmazie
Albert-Ludwigs-Universität Freiburg

DOI
10.1039/C4CP01566E
URN
urn:nbn:de:bsz:25-freidok-123054
Rights
Der Zugriff auf das Objekt ist unbeschränkt möglich.
Last update
15.08.2025, 7:33 AM CEST

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Associated

Time of origin

  • 2014

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