Relating the morphology of poly(p-phenylene vinylene)/methanofullerene blend to bulk heterojunction solar cell performance

J.K.J. Duren, van, X.N. Yang, J. Loos, C.W.T. Bulle-Lieuwma, A.B. Sieval, J.C. Hummelen, R.A.J. Janssen

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

3 Citations (Scopus)
1 Downloads (Pure)

Abstract

Few techniques are available where the morphology of blends can be determined in all three dimensions on a nanometer scale. Here we describe the use of a combination of techniques to resolve the morphology both laterally and vertically in spin cast films of a poly(p-phenylene vinylene)/methanofullerene blend. These blends are used as photoactive films in plastic bulk heterojunction solar cells where the performance strongly depends on the molecular morphology. In addition to depth profiling by dynamic time-of-flight secondary ion mass spectrometry (TOF-SIMS), tapping-mode atomic force microscopy (TM-AFM), transmission electron microscopy (TEM), absorption and emission spectroscopy and time-correlated single photon counting fluorescence measurements were used to investigate the morphology of ~100 nm thick spin cast composites with varying composition of 1-(3-methoxycarbonyl)propyl-1-phenyl-[6,6]-methanofullerene (PCBM) and poly[2-methoxy-5-(3',7'-dimethyloctyloxy)-1,4-phenylene vinylene] (MDMO-PPV). Combining all results showed clustering of PCBM into rather pure separate domains in a matrix of ~50 wt% MDMO-PPV for composites with PCBM concentrations 80-100 wt%, and no spontaneous stratification. Electrical characterization, under illumination and in the dark, of the composite devices revealed the percolation threshold for electron transport and showed a reduction in recombination-limitation for the photocurrent of these solar cells as a result of an improved charge transport and collection efficiency with increasing fullerene concentration.
Original languageEnglish
Title of host publicationOrganic Photovoltaics IV, 7-8 August 2003, San Diego, California, USA
EditorsZ.H. Kafafi, P.A. Lane
Place of PublicationBellingham, Wash.
PublisherSPIE
Pages99-110
ISBN (Print)0-8194-5088-X
DOIs
Publication statusPublished - 2004
Eventconference; Organic photovoltaics IV -
Duration: 1 Jan 2004 → …

Publication series

NameProceedings of SPIE
Volume5215
ISSN (Print)0277-786X

Conference

Conferenceconference; Organic photovoltaics IV
Period1/01/04 → …
OtherOrganic photovoltaics IV

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