Current trends in the optimization of low band gap polymers in bulk heterojunction photovoltaic devices

Jodi M. Szarko; Jianchang Guo; Brian S. Rolczynski; Lin X. Chen

doi:10.1039/C0JM04433D

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Journal of Materials Chemistry

Issue 22, 2011

Journal of Materials Chemistry was published between 1991 and 2012. From issue 1, 2013, it was replaced by three new journals: Journal of Materials Chemistry A, B and C

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Current trends in the optimization of low band gap polymers in bulk heterojunction photovoltaic devices

Jodi M. Szarko,^a Jianchang Guo,^b^c Brian S. Rolczynski^a^b and Lin X. Chen*^a^b

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Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, USA
E-mail: l-chen@northwestern.edu

Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, USA

Department of Chemistry and The James Franck Institute, The University of Chicago, 929 E 57th. Street, Chicago, USA

J. Mater. Chem., 2011,21, 7849-7857

DOI: 10.1039/C0JM04433D
Received 18 Dec 2010, Accepted 16 Feb 2011
First published online 07 Apr 2011

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Applications of low band gap polymers in solar cells have attracted intense attention due to their energetic overlap with the solar spectrum. Recently, low band gap organic photovoltaic (OPV) materials have shown an unprecedented [similar] 8% efficiency in solar cell devices. Although the energetic alignment is crucial in the optimization of these materials, the structural and kinetic effects are also important factors in the overall device performance. Here we focus on the morphology and charge separation kinetics of several energetically similar low band gap materials. Special emphasis will be on two polymers, PF and PTB, in this report.