Finely Tuned Electron/Hole Transport Preference of Thiazoloisoindigo-based Conjugated Polymers by Incorporation of Heavy Chalcogenophenes

A series of copolymers of thiazoloisoindigo (TzII) with different chalcogenophene trimers were synthesized to systematically investigate the chalcogen effect on their charge transport properties. When only the middle thiophene ring of terthiphene (T-T-T) is replaced by heavier chalcogenophenes, a pr...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Chinese journal of polymer science 2021-07, Vol.39 (7), p.838-848
Hauptverfasser: Li, Chen-Chen, Xiong, Miao, Peng, Jia-Wei, Wang, Jie-Yu, Zhang, Huan-Rui, Mu, You-Bing, Pei, Jian, Wan, Xiao-Bo
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:A series of copolymers of thiazoloisoindigo (TzII) with different chalcogenophene trimers were synthesized to systematically investigate the chalcogen effect on their charge transport properties. When only the middle thiophene ring of terthiphene (T-T-T) is replaced by heavier chalcogenophenes, a preference (expressed by the ratio of μ e / μ h ) towards electron transport was observed descending from T-T-T to T-Se-T then to T-Te-T (Se and Te stand for selenophene and tellurophene, respectively). On the other hand, with the increased number of heavier chalcogenophenes, a preference toward hole transport was observed descending from Se-T-Se to Se-Se-Se then to Se-Te-Se. This phenomenon is well-explained by the balance between the aromatic resonance energy of the chalcogenophenes and the electronegativity of the chalcogens. Specifically, P(TzII-T-Se-T) displayed relatively balanced ambipolar property ( μ h max and μ e max of 3.77 and 1.59 cm 2 ·V −1 ·s −1 with a μ e / μ h of 0.42), while P(Tzll-Se-Te-Se) exhibited the best preference to hole transfer with a μ e / μ h of 0.09. P(Tzll-T-Te-T) exhibited the best preference to electron transfer with a μ e / μ h , of 16 and the μ e max of 0.64 cm 2 ·V −1 ·s −1 which is the highest electron mobility among the known conjugated polymers containing tellurophenes.
ISSN:0256-7679
1439-6203
DOI:10.1007/s10118-021-2552-9