High-temperature stability of organic field-effect transistors(OFETs)is critical to ensure its long-term reliable operation under various environmental conditions.The molecular packing of donor-acceptor(D-A)conjugated...High-temperature stability of organic field-effect transistors(OFETs)is critical to ensure its long-term reliable operation under various environmental conditions.The molecular packing of donor-acceptor(D-A)conjugated polymers is closely related to the electrical performance stability in OFETs.Herein,we choose poly[[N,N′-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5′-(2,2′-bithiophene)]as a modal system to reveal the relationship between the molecular stacking and electrical stability in high-temperature environment.The results demonstrate that the films with D-A moieties in alternate stacking have better electrical thermal stability compared to normal donor-donor(D-D)stacking.The D-A stacking configuration alternates donor and acceptor units along the out-of-plane direction,while the D-D stacking involves D-D and A-A stacking separately.The structural transition from D-D to D-A is captured at a treated temperature range of 225±250°C.Owing to the tighter packing arrangement along theπ-πand lamellar directions,the electron mobility of the D-A stacked films reaches up to 0.23 cm^(2)/V·s,a 50%increase as compared to the D-D stacking films.Furthermore,the D-A stacked films indicate superior electrical performance stability with mobility retaining 100%at 250°C during high-temperature cycling tests.This result highlights that the manipulation of conjugated polymer closely stacked structures can significantly enhance the thermal stability and durability of semiconductor devices.展开更多
基金financially supported by the Nation Key R&D Program China (2022YFB3603804)Natural Science Foundation of Shanghai (22ZR1407800)Postdoctoral Science Foundation of China (2021M700800)。
文摘High-temperature stability of organic field-effect transistors(OFETs)is critical to ensure its long-term reliable operation under various environmental conditions.The molecular packing of donor-acceptor(D-A)conjugated polymers is closely related to the electrical performance stability in OFETs.Herein,we choose poly[[N,N′-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5′-(2,2′-bithiophene)]as a modal system to reveal the relationship between the molecular stacking and electrical stability in high-temperature environment.The results demonstrate that the films with D-A moieties in alternate stacking have better electrical thermal stability compared to normal donor-donor(D-D)stacking.The D-A stacking configuration alternates donor and acceptor units along the out-of-plane direction,while the D-D stacking involves D-D and A-A stacking separately.The structural transition from D-D to D-A is captured at a treated temperature range of 225±250°C.Owing to the tighter packing arrangement along theπ-πand lamellar directions,the electron mobility of the D-A stacked films reaches up to 0.23 cm^(2)/V·s,a 50%increase as compared to the D-D stacking films.Furthermore,the D-A stacked films indicate superior electrical performance stability with mobility retaining 100%at 250°C during high-temperature cycling tests.This result highlights that the manipulation of conjugated polymer closely stacked structures can significantly enhance the thermal stability and durability of semiconductor devices.
