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Naphthodithiophene-Diketopyrrolopyrrole Small Molecule Donors for Efficient Solution-Processed Solar Cells

Published online by Cambridge University Press:  02 March 2012

Stephen Loser ,
Carson J. Bruns ,
Hiroyuki Miyauchi ,
Rocío Ponce Ortiz ,
Antonio Facchetti ,
Samuel I. Stupp  and
Tobin J. Marks
Stephen Loser
Affiliation:
Department of Chemistry, Northwestern University, 2145 North Sheridan Road, Evanston, Illinois 60208 USA The Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208 USA
Carson J. Bruns
Affiliation:
Department of Chemistry, Northwestern University, 2145 North Sheridan Road, Evanston, Illinois 60208 USA
Hiroyuki Miyauchi
Affiliation:
Department of Chemistry, Northwestern University, 2145 North Sheridan Road, Evanston, Illinois 60208 USA
Rocío Ponce Ortiz
Affiliation:
Department of Chemistry, Northwestern University, 2145 North Sheridan Road, Evanston, Illinois 60208 USA
Antonio Facchetti
Affiliation:
Department of Chemistry, Northwestern University, 2145 North Sheridan Road, Evanston, Illinois 60208 USA The Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208 USA Polyera Corporation, 8045 Lamon Avenue, Skokie, Illinois 60077 USA
Samuel I. Stupp
Affiliation:
Department of Chemistry, Northwestern University, 2145 North Sheridan Road, Evanston, Illinois 60208 USA The Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208 USA Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208 USA Department of Medicine and the Institute for BioNanotechnology in Medicine, Northwestern University, Chicago, Illinois 60611 USA
Tobin J. Marks
Affiliation:
Department of Chemistry, Northwestern University, 2145 North Sheridan Road, Evanston, Illinois 60208 USA The Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University, Evanston, Illinois 60208 USA
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Abstract

We report the synthesis, characterization, and implementation of various naphtho[2,3- b:6,7-b’]dithiophene (NDT)-based donor molecules for organic photovoltaics (OPVs) When NDT(TDPP)2 (TDPP = thiophene-capped diketopyrrolopyrrole) contains all branched 2- ethylhexyl chains and is combined with the electron acceptor PC61BM, a power conversion efficiency (PCE) of 4.06±0.6% is achieved. This respectable PCE is attributed to the broad, high oscillator strength visible absorption, the ordered molecular packing, and a high hole mobility of 0.04 cm2·V-1·s-1. We find utilizing linear C-12 side chains on either the TDPP or NDT framework dramatically increases the d-spacing, which directly correlates with inferior OPV device performance. This leads to the conclusion that the selection of an appropriate side chain plays a key role in determining OPV device performance of a small molecule donor.

Keywords

photovoltaicorganicsolution deposition
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1390: Symposium H/I – Organic Photovoltaics–Materials to Devices , 2012 , mrsf11-1390-h03-05
Copyright
Copyright © Materials Research Society 2012

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References

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