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Controlling Organization in Photovoltaic Diodes from Discotic Liquid Crystals via Anode Surface Energy Alteration

Published online by Cambridge University Press:  01 February 2011

Johanna P. Schmidtke ,
Klaus Müllen  and
Richard H. Friend
Johanna P. Schmidtke
Affiliation:
Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom
Klaus Müllen
Affiliation:
Max Planck Institut für Polymerforschung, Ackermannweg 10 55128 Mainz, Germany
Richard H. Friend
Affiliation:
Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom
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Abstract

We report the control of molecular ordering of discotic liquid crystals in thin, blended films used in photovoltaic diodes. The external quantum efficiency (EQE%) of photovoltaic diodes incorporating a crystalline hexabenzocoronene (HBC) derivative is improved by lowering the surface energy of the transparent anode surface with a short alkyl chain. Upon increasing the length of the functionalizing group on the anode, we find that the relative efficiency of the HBC component in the blend improves. Evidence of changed film morphology is also presented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 836: Symposium L – Materials for Photovoltaics , 2004 , L4.7
Copyright
Copyright © Materials Research Society 2005

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References

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