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Effect of Transparent Electrode on the Performance of Bulk Heterojunction Solar Cells

Published online by Cambridge University Press:  01 February 2011

A.A. Damitha T Adikaari ,
Joe Briscoe ,
Steve Dunn ,
David Carey  and
Ravi Silva
A.A. Damitha T Adikaari
Affiliation:
[email protected], University of Surrey, Advanced Technology Institute, Guildford, United Kingdom
Joe Briscoe
Affiliation:
[email protected], Cranfield University, Nanotechnology Centre, Cranfield, Bedford, United Kingdom
Steve Dunn
Affiliation:
[email protected], University of London, Materials Department, School of Engineering and Materials, Queen Mary, London, United Kingdom
David Carey
Affiliation:
[email protected], University of Surrey, Advanced Technology Institute, University of Surrey, Guildford, GU2 7XH, United Kingdom
Ravi Silva
Affiliation:
[email protected], Advanced Technology Institute, Faculty of Engineering and Physical Sciences, Guildford, Surrey, United Kingdom
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Abstract

We present a performance comparison of polythiophene/fullerene derivative bulk heterojunction solar cells fabricated on fluorinated tin oxide (FTO) and indium tin oxide (ITO) in the presence and absence of the commonly used poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) hole extraction layer. From a potential commercial perspective the performance of cheaper and more readily available FTO compares well with the more expensive ITO in terms of measured device efficiency (FTO:2.8 % and ITO:3.1%). The devices show similar fill factors (FTO:63% and ITO:64%) with the same open circuit voltage of 0.6 V. The short circuit current density is lower for FTO devices at 7.5 mA/cm2 which compares with 8.0 mA/cm2 for ITO; a behaviour that is mainly attributed to the reduced optical transmission of the FTO layer. Importantly, these devices were part fabricated and wholly characterized under atmospheric conditions. The quoted device performance is the best reported for FTO based bulk heterojunction systems in the absence of the highly acidic PEDOT:PSS hole extraction layer, which is believed to degrade conductive oxides.

Keywords

photovoltaicorganicelectronic material
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1270: Symposia GG/HH/II – Organic Photovoltaics and Related Electronics-From Excitons to Devices , 2010 , 1270-HH14-23
Copyright
Copyright © Materials Research Society 2010

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