A series of copolymers of thiazoloisoindigo (Tzll) with different chalcogenophene trimers were synthesized to systematicllyinvestigate the chalcogen effect on their charge transport propertes.When only the middlethiop...A series of copolymers of thiazoloisoindigo (Tzll) with different chalcogenophene trimers were synthesized to systematicllyinvestigate the chalcogen effect on their charge transport propertes.When only the middlethiophene ring of terthiphene(T-T-T)is replaced byheavier chalcogenophenes,a preference(expressed by the ratio of μe/μh)towards electron transport was observed descending from T-T-Tto T-Se-Tthen to T-Te-T(Se and Te stand for selenophene and tellurophene,respectively).On the other hand,with the increased number of heavierchalcogenophenes,a preference toward hole transport was observed descending from Se-T-Se to Se-Se-se then to Se-Te-Se.This phenomenon iswellexplained by the balance between the aromatic resonance energy of the chalcogenophenes and the electronegativity of the chalcogens.Specifically,P(TZll-T-Se-T)displayed relatively balanced ambipolar property(μh^(max)andμe^(max) of 3.77 and 1.59 cm^(2)·v^(-1)·s^(-1)with aμe/μh of 0.42).while P(Tll-Se-Te-Se)exhibited the best preference to hole transfer with a u.u,of 0.09.P(Tzll-T-Te-T)exhibited the best preference to electrontransfer with aμe/μl,of 16 and theμe^(max)of 0.64 cm^(2)·v^(-).s^(-1)which is the highest electron mobility among the known conjugated polymerscontaining tellurophenes.展开更多
Electron-rich thiophene-flanked thiazoloisoindigo(Th-TzII)has been reported as a building block for ambipolar polymeric field-effect transistors however with preferable hole transport.Here,we report that by using an e...Electron-rich thiophene-flanked thiazoloisoindigo(Th-TzII)has been reported as a building block for ambipolar polymeric field-effect transistors however with preferable hole transport.Here,we report that by using an electron deficient thiazole as the flanked moiety,the corresponding thiazoloisoindigo(Tz-TzII)can still be synthesized,although in a more sinuous way.Theoretical calculation and experimental results demonstrate that Tz-TzII is more electron-deficient than Th-TzII,and the corresponding polymer P(TzII-Tz-T-Tz)exhibits high and balanced hole/electron mobility of 0.70/0.64 cm^(2)·V^(-1)·s^(-1).展开更多
基金the National Natural Science Foundation of China(Nos.22075105 and 51573204)National Science Foundation of Shandong Province(No.ZR2018ZB0315)+1 种基金H.Zhang thanks the financial support from the National Natural Science Foundation of China(No.51803230)Prof.J.Wang thanks the financial support from the Opening Project of Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education,Jianghan University.The authors thank Dr.Chunming Yang for GIWAXS tests and beamline BL16B1(Shanghai Synchrotron Radiation Facility)for providing beam time.
文摘A series of copolymers of thiazoloisoindigo (Tzll) with different chalcogenophene trimers were synthesized to systematicllyinvestigate the chalcogen effect on their charge transport propertes.When only the middlethiophene ring of terthiphene(T-T-T)is replaced byheavier chalcogenophenes,a preference(expressed by the ratio of μe/μh)towards electron transport was observed descending from T-T-Tto T-Se-Tthen to T-Te-T(Se and Te stand for selenophene and tellurophene,respectively).On the other hand,with the increased number of heavierchalcogenophenes,a preference toward hole transport was observed descending from Se-T-Se to Se-Se-se then to Se-Te-Se.This phenomenon iswellexplained by the balance between the aromatic resonance energy of the chalcogenophenes and the electronegativity of the chalcogens.Specifically,P(TZll-T-Se-T)displayed relatively balanced ambipolar property(μh^(max)andμe^(max) of 3.77 and 1.59 cm^(2)·v^(-1)·s^(-1)with aμe/μh of 0.42).while P(Tll-Se-Te-Se)exhibited the best preference to hole transfer with a u.u,of 0.09.P(Tzll-T-Te-T)exhibited the best preference to electrontransfer with aμe/μl,of 16 and theμe^(max)of 0.64 cm^(2)·v^(-).s^(-1)which is the highest electron mobility among the known conjugated polymerscontaining tellurophenes.
基金financially supported by the National Natural Science Foundation of China(Nos.22075105 and 22102086)the start-up funding from Jianghan University。
文摘Electron-rich thiophene-flanked thiazoloisoindigo(Th-TzII)has been reported as a building block for ambipolar polymeric field-effect transistors however with preferable hole transport.Here,we report that by using an electron deficient thiazole as the flanked moiety,the corresponding thiazoloisoindigo(Tz-TzII)can still be synthesized,although in a more sinuous way.Theoretical calculation and experimental results demonstrate that Tz-TzII is more electron-deficient than Th-TzII,and the corresponding polymer P(TzII-Tz-T-Tz)exhibits high and balanced hole/electron mobility of 0.70/0.64 cm^(2)·V^(-1)·s^(-1).
