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Intensity-Modulated Photovoltage Spectroscopy at Evaporated Bulk Heterojunctions of PcCu and C60 to Determine the Average Effective Lifetime of Charge Carriers

Published online by Cambridge University Press:  25 January 2013

André Dragässer  and
Derck Schlettwein
André Dragässer
Affiliation:
Institute of Applied Physics, Laboratory of Materials Research, Justus-Liebig-University, Giessen, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany.
Derck Schlettwein
Affiliation:
Institute of Applied Physics, Laboratory of Materials Research, Justus-Liebig-University, Giessen, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany.
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Abstract

Organic solar cells consisting of Phthalocyaninatocopper (PcCu) as donor and the Buckminsterfullerene C60 as acceptor molecule were prepared by physical vapor deposition as planar or bulk heterojunctions. The devices were studied by IV-characterization as well as intensity-modulated photovoltage spectroscopy to determine the average lifetime of charge carriers formed subsequent to light absorption. An increasing charge carrier lifetime was determined for an increasing PcCu-content in the films. Back transfer of electrons at the undesired contact of C60 with PEDOT:PSS as well as recombination following hole trapping in interface states in the contact of PcCu with C60 or in isolated domains of PcCu are discussed as possible origins.

Keywords

organicphotovoltaicphysical vapor deposition (PVD)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1493: Symposium E/H – Photovoltaic Technologies, Devices and Systems Based on Inorganic Materials, Small Organic Molecules and Hybrids , 2013 , pp. 303 - 308
Copyright
Copyright © Materials Research Society 2013 

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References

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