Title: Improved efficiency of bulk heterojunction hybrid solar cells by utilizing CdSe quantum dot–graphene nanocomposites
Authors : Eck, Michael
Van Pham, Chuyen
Züfle, Simon
Neukom, Martin
Sessler, Martin
Scheunemann, Dorothea
Erdem, Emre
Weber, Stefan
Borchert, Holger
Ruhstaller, Beat
Krüger, Michael
Published in : Physical Chemistry Chemical Physics
Volume(Issue) : 16
Issue : 24
Pages : 12251
Pages to: 12260
Publisher / Ed. Institution : Royal Society of Chemistry
Issue Date: 2014
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : English
Subject (DDC) : 621.3: Electrical engineering and electronics
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.
Departement: School of Engineering
Organisational Unit: Institute of Computational Physics (ICP)
Publication type: Article in scientific Journal
DOI : 10.1039/c4cp01566e
ISSN: 1463-9076
URI: https://digitalcollection.zhaw.ch/handle/11475/6932
Appears in Collections:Publikationen School of Engineering

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