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Enhancing the open-circuit voltage of molecular photovoltaics using oxidized au nanocrystals

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Pegg, Lara-Jane, Schumann, Stefan and Hatton, Ross A. (2010) Enhancing the open-circuit voltage of molecular photovoltaics using oxidized au nanocrystals. ACS Nano, Vol.4 (No.10). pp. 5671-5678. doi:10.1021/nn101276z ISSN 1936-0851.

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Official URL: http://dx.doi.org/10.1021/nn101276z

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Abstract

For organic photovoltaics (OPV) to realize applications effective strategies to maximize the open-circuit voltage must be developed. Herein we show that solution-processed surface-oxidized Au nanoctystals (o-AuNC) dramatically increase the open-circuit voltage (V-oc) of OPV cells based on boron-subphthalocyanine chloride (SubPc)/C-60 and chloro-aluminum phthalocyanine (CIAIPc)/C-60 heterojunctions when incorporated at the interface between the hole-extracting electrode and the phthalocyanine donor layer. In addition, the cell-to-cell variation in V-oc is reduced by up to 10-fold combined with a large reduction in the light intensity dependence of V-oc, both of which are important advantages for practical application. The largest increase in V-oc is achieved for SubPc/C-60-based cells which exhibit a 45% increase to 1.09 +/- 0.01 V-an exceptionally high value for a single junction small molecule OPV. Remarkably these improvements are achieved using submonolayers of o-AuNC, which can be rationalized in terms of the exceptionally high work function of o-AuNC (similar to 5.9 eV) and geometric electric field enhancement effects.

Item Type: Journal Article
Subjects: Q Science > QD Chemistry
T Technology
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Science, Engineering and Medicine > Science > Chemistry
Journal or Publication Title: ACS Nano
Publisher: American Chemical Society
ISSN: 1936-0851
Official Date: October 2010
Dates:
DateEvent
October 2010Published
Volume: Vol.4
Number: No.10
Number of Pages: 8
Page Range: pp. 5671-5678
DOI: 10.1021/nn101276z
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Engineering and Physical Sciences Research Council (EPSRC), European Regional Development Fund (ERDF), Royal Academy of Engineering, Advantage West Midlands (AWM)
Grant number: 2

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