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Open-Circuit Voltage Characteristics in Polyfluorene Based Photovoltaic Devices

Published online by Cambridge University Press:  01 February 2011

Catherine M. Ramsdale ,
Ana Claudia Arias ,
J. Devin MacKenzie ,
Richard H. Friend  and
Neil C. Greenham
Catherine M. Ramsdale
Affiliation:
Cavendish Laboratory, Madingley Road, Cambridge, CB3 0HE, UK
Ana Claudia Arias
Affiliation:
Cavendish Laboratory, Madingley Road, Cambridge, CB3 0HE, UK
J. Devin MacKenzie
Affiliation:
Cavendish Laboratory, Madingley Road, Cambridge, CB3 0HE, UK
Richard H. Friend
Affiliation:
Cavendish Laboratory, Madingley Road, Cambridge, CB3 0HE, UK
Neil C. Greenham
Affiliation:
Cavendish Laboratory, Madingley Road, Cambridge, CB3 0HE, UK
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Abstract

In this work the origin of the open-circuit voltage is studied in bi-layer devices based on polyfluorenes. The devices were fabricated using a lamination technique, which avoids the problems that usually arise when making well-defined bi-layers from soluble polymers. Often the open-circuit voltage in devices is attributed to the difference in the workfunctions of the electrodes. Whilst a cathode dependence of the open-circuit voltage was observed here, an additional constant voltage of ∼1V was also present in the devices investigated. We conclude that this additional open-circuit voltage is largely a result of a photo-induced dipole at the donoracceptor interface. This dipole is formed by charges that are separated as a result of exciton dissociation when the device is illuminated. Devices where the order of the polymer layers was reversed showed very different open-circuit voltages which confirms that the open-circuit voltage is heavily dependent on the structure of the active layer in the device. The effects of device thickness and excitation intensity on open-circuit voltage are also discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 725: Symposium P – Organic and Polymeric Materials and Devices-Optical, Electrical, and Optoelectronic Properties , 2002 , P7.8
Copyright
Copyright © Materials Research Society 2002

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