Journal
POLYMER CHEMISTRY
Volume 5, Issue 22, Pages 6545-6550Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4py00791c
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Funding
- Ministry of Education, Science and Technology, Korea through the Global Research Laboratory (GRL) program
- National Research Foundation of Korea [2007-00015] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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New low bandgap conjugated copolymers based on isoindigo and three different chalcogenophenes (thiophene, selenophene and tellurophene) were synthesized (denoted as PIT, PISe and PITe, respectively) to investigate the effect of different chalcogenophenes on their photovoltaic properties. PISe and PITe show lower bandgaps and deeper HOMO energy levels as compared to PIT. The solar cell device based on PISe blended with PC61BM exhibits a promising PCE of 5.72% with a J(SC) of 10.21 mA cm(-2), while PITe shows the lowest PCE of 1.16% with the lowest J(SC) of 2.51 mA cm(-2) because of its coarse morphology although the field-effect hole mobility of PITe is the highest due to higher crystallinity than others.
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