Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 19, Issue 39, Pages 13242-13248Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201300445
Keywords
copolymerization; donor-acceptor systems; photovoltaic systems; thin films; semiconductors
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [2012047047]
- New and Renewable Energy Technology Development Program of KETEP of the Ministry of Knowledge Economy [20113020010070]
- National Agenda Project Program [NAP-08-1]
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We describe herein the synthesis of novel donor-acceptor conjugated polymers with dithienobenzodithiophenes (DTBDT) as the electron donor and 2,1,3-benzothiadiazole as the electron acceptor for high-performance organic photovoltaics (OPVs). We studied the effects of strategically inserting thiophene into the DTBDT as a substituent on the skeletal structure on the opto-electronic performances of fabricated devices. From UV/Vis absorption, electrochemical, and field-effect transistor analyses, we found that the thiophene-containing DTBDT derivative can substantially increase the orbital overlap area between adjacent conjugated chains and thus dramatically enhance charge-carrier mobility up to 0.55cm(2)V(-1)s(-1). The outstanding charge-transport characteristics of this polymer allowed the realization of high-performance organic solar cells with a power conversion efficiency (PCE) of 5.1%. Detailed studies on the morphological factors that enable the maximum PCE of the polymer solar cells are discussed along with a hole/electron mobility analysis based on the space-charge-limited current model.
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