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Variation of the Photocurrent Spectra due to Energy Dependent Hole Mobility in Organic Bulk Hetero-junction Solar Cells

Published online by Cambridge University Press:  13 August 2012

Buddika K. Abeyweera  and
Bruce W. Alphenaar
Buddika K. Abeyweera
Affiliation:
Dept. of Electrical & Computer Engineering, University of Louisville, Louisville, KY. U.S.A.
Bruce W. Alphenaar
Affiliation:
Dept. of Electrical & Computer Engineering, University of Louisville, Louisville, KY. U.S.A.
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Abstract

A comparison of the photocurrent spectra of organic bulk heterojunction solar cells of various thicknesses is presented. Increasing the thickness of the active layer in both MDMO-PPV /PCBM and P3HT/PCBM solar cells reduces the magnitude of the photocurrent due to the low mobility of the photogenerated holes. Measurements show that the photocurrent reduction is predominately due to a loss in carriers generated at the polymer absorption maximum, while the low energy response is relatively unaffected. In a thick enough sample, the low energy response (1.5-2 eV) dominates, and a photocurrent peak is no longer observed at the main absorption maximum (2.6 eV). The results imply that hole transport is blocked for carriers generated in the polymer at higher energy. Because these holes are generated at the absorption maximum their low mobility could be a major factor limiting solar cell efficiency.

Keywords

photovoltaicorganicluminescence
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1435: Symposium J – Organic and Hybrid-Organic Electronics , 2012 , mrss12-1435-j10-22
Copyright
Copyright © Materials Research Society 2012

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References

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