Abstract
A series of small molecules based on acceptor-donor-acceptor-donor-acceptor molecular skeletons, which contained a diketopyrrolopyrrole core as the central acceptor unit, two oligomeric benzene or thiophene as the donor, and two isoindigo or benzothienoisoindigo as the weaker acceptor, were synthesized. The influence of the number of thiophene on optical physical, crystallinity, charge carrier mobility, the morphologies of blend films, electrochemical and photovoltaic properties was investigated. The absorption of the diketopyrrolopyrrole based compounds showed a general trend of red-shift with increased number of thiophene. The highest occupied molecular orbital energy levels of the materials increased as a result of substitution benzene with thiophene as donor. X-ray diffraction measurement indicated that all these materials have strong crystallinity. Characterizations of morphology by atomic force microscopy and carrier mobilities revealed that the number of thiophene units influenced the microstructure of the blend films and the performance of organic solar cells.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
