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n-Type Conjugated Polymers Based on Double B←N Bridged Bipyridine Unit.
1State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China.
Accounts of Chemical Research
|November 23, 2024
Summary
Boron-nitrogen bipyridine (BNBP) based conjugated polymers offer a promising alternative to traditional n-type materials for organic electronics. These polymers exhibit high electron mobility and tunable optoelectronic properties, enabling high-performance organic solar cells and transistors.
Area of Science:
- Materials Science
- Organic Electronics
- Polymer Chemistry
Background:
- Development of n-type conjugated polymers lags behind p-type counterparts due to a lack of suitable electron-withdrawing building blocks.
- Imide-based units are common electron-withdrawing groups, but alternatives are sought for enhanced material diversity.
- Boron-nitrogen coordination bond (B←N) bridged bipyridine (BNBP) emerged as a novel electron-withdrawing building block in 2016.
Purpose of the Study:
- To summarize the research progress on BNBP-based conjugated polymers.
- To discuss the molecular design, synthesis, chemistry, and optoelectronic properties of BNBP and its polymers.
- To elucidate the structure-property-performance relationships for BNBP-based n-type conjugated polymers in various organic optoelectronic devices.
Main Methods:
- Synthesis and characterization of BNBP building blocks and derived conjugated polymers.
- Investigation of optoelectronic properties including light absorption, fluorescence, electron mobility, and energy levels (LUMO).
- Fabrication and performance evaluation of organic optoelectronic devices utilizing BNBP-based polymers.
Main Results:
- BNBP possesses a planar structure, low-lying energy levels, strong fluorescence, and facile functionalization.
- BNBP-based conjugated polymers exhibit high electron mobility (even in the amorphous state), tunable LUMO levels, medium bandgaps, and narrow visible absorption spectra.
- Demonstrated high performance in devices: 10% PCE in OSCs, 26% PCE in IPVs, 0.3 cm2 V−1 s−1 electron mobility in OFETs, 25 μW m−1 K−2 power factor in OTEs, and 1.79 × 1013 cm Hz1/2 W−1 detectivity in OPDs.
Conclusions:
- BNBP-based conjugated polymers are a significant class of materials for high-performance organic optoelectronics.
- Rational molecular design leads to tunable properties and excellent device performance.
- Further research on electronic structures and exploration of new applications are warranted.
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