Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 26, Pages 23410-23416Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b05361
Keywords
imide; semiconducting polymers; n-type; acceptor; organic field-effect transistors; organic photovoltaics
Funding
- Advanced Low Carbon Technology Research and Development Program (ALCA) from JST [JPMJAL 1404]
- KAKENHI from JSPS [16H04196]
- Grants-in-Aid for Scientific Research [16H04196] Funding Source: KAKEN
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N-type (electron-transporting) semiconducting polymers are essential materials for the development of truly plastic electronic devices. Here, we synthesized for the first time dithiazolylthienothiophene bisimide (TzBI), as a new family for imide-based electron-deficient pi-conjugated systems, and semiconducting polymers by incorporating TzBI into the pi-conjugated backbone as the building unit. The TzBI-based polymers are found to have deep frontier molecular orbital energy levels and wide optical bandgaps compared to the dithienylthienothiophene bisimide (TBI) counterpart. It is also found that TzBI can promote the pi-pi intermolecular interactions of the polymer backbones relative to TBI most probably because the thiazole ring, which replaced the thiophene ring, at the end of the framework gives a more coplanar backbone. In fact, TzBI-based polymers function as the n-type semiconducting material in both organic field-effect transistor (OFET) and organic photovoltaic (OPV) devices. Notably, one of the TzBI-based polymers provides a power conversion efficiency of 3.3% in the all-polymer OPV device, which could be high for a low-molecular-weight polymer (<10 kDa). Interestingly, while many of the n type semiconducting polymers utilized in OPVs have narrow bandgaps, the TzBI-based polymers have wide bandgaps. This is highly beneficial for complementing the visible to near-IR light absorption range when blended with p-type narrow bandgap polymers that have been widely developed in the last decade. The results demonstrate great promise and possibility of TzBI as the building unit for n-type semiconducting polymers.
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