Effects of Bithiophene Imide Fusion on the Device Performance of Organic Thin-Film Transistors and All-Polymer Solar Cells.
Angew Chem Int Ed Engl
; 56(48): 15304-15308, 2017 11 27.
Article
en En
| MEDLINE
| ID: mdl-28994496
ABSTRACT
Two new bithiophene imide (BTI)-based n-type polymers were synthesized. f-BTI2-FT based on a fused BTI dimer showed a smaller band gap, a lower LUMO, and higher crystallinity than s-BTI2-FT containing a BTI dimer connected through a single bond. s-BTI2-FT exhibited a remarkable electron mobility of 0.82â
cm2 V-1 s-1 , and f-BTI2-FT showed a further improved mobility of 1.13â
cm2 V-1 s-1 in transistors. When blended with the polymer donor PTB7-Th, f-BTI2-FT-based all-polymer solar cells (all-PSCs) attained a PCE of 6.85 %, the highest value for an all-PSC not based on naphthalene (or perylene) diimide polymer acceptors. However, s-BTI2-FT all-PSCs showed nearly no photovoltaic effect. The results demonstrate that f-BTI2-FT is one of most promising n-type polymers and that ring fusion offers an effective approach for designing polymers with improved electrical properties.
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MEDLINE
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En
Revista:
Angew Chem Int Ed Engl
Año:
2017
Tipo del documento:
Article
País de afiliación:
China