Donor−acceptor(D−A)conjugated polymers are promising materials for organic transistors including organic field-effect transistors(OFETs)and organic electrochemical transistors(OECTs).The aggregated structure of D−A co...Donor−acceptor(D−A)conjugated polymers are promising materials for organic transistors including organic field-effect transistors(OFETs)and organic electrochemical transistors(OECTs).The aggregated structure of D−A conjugated polymer films,which strongly depends on the crystallization process,is crucial for the device performance.However,the crystallization of D−A conjugated polymers is complicated during solution processing,and the optimal film structure is various in different applications.Therefore,it is significantly important to reveal the relationship between the processing conditions and the resulting aggregated structures.This review provides a systematic understanding of how to control the aggregated structure of D−A conjugated polymer films from the fundamental mechanisms of polymer crystallization.We first discuss the possible nucleation and growth mechanisms of D−A conjugated polymers based on traditional theories or models and current findings.Then,recent progress in controlling the structure of D−A conjugated polymer films for OFETs and OECTs is reviewed.D−A conjugated polymers generally adopt chain-extended crystallization due to their strongly rigid backbone,which makes homogeneous nucleation difficult.A common strategy to control the aggregated structure of D−A conjugated polymer films is to manipulate the heterogeneous nucleation process by tuning the preaggregation.Besides,the effect of the crystallization rate and complicated conditions on the aggregated structure of D−A conjugated polymer films is also discussed.Finally,a concise summary is provided,followed by some current challenges in controlling the aggregated structure of D−A conjugated polymer films.展开更多
Donor–acceptor(D-A)conjugated polymers have demonstrated great potential in organicfield-effect transistors application,and their aggregated structure is a crucial factor for high charge mobility.However,the aggregat...Donor–acceptor(D-A)conjugated polymers have demonstrated great potential in organicfield-effect transistors application,and their aggregated structure is a crucial factor for high charge mobility.However,the aggregated structure of D-A conjugated polymerfilms is complex and the structure–property relationship is difficult to understand.This review provides an overview of recent progress in controlling the aggregated structure of D-A conjugated polymerfilms for higher mobility,including the mechanisms,methods,and properties.Wefirst discuss the multilevel microstructures of D-A conjugated polymerfilms,and then summarize the current understanding of the relationship betweenfilm microstructures and charge transport properties.Subsequently,we review the theory of D-A conjugated polymer crystallization.After that,we summarize the common methods to control the aggregated structure of semi-crystalline and near-amorphous D-A conjugated polymerfilms,such as crystallites and aggregates,tie chains,film alignment,and attempt to understand them from the basic theory of polymer crystallization.Finally,we provide the current challenges in controlling the aggregated structure of D-A conjugated polymerfilms and in understanding the structure–property relationship.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.52433009,22203028)the Natural Science Foundation of Hunan Province,China(Grant No.2024JJ5138).
文摘Donor−acceptor(D−A)conjugated polymers are promising materials for organic transistors including organic field-effect transistors(OFETs)and organic electrochemical transistors(OECTs).The aggregated structure of D−A conjugated polymer films,which strongly depends on the crystallization process,is crucial for the device performance.However,the crystallization of D−A conjugated polymers is complicated during solution processing,and the optimal film structure is various in different applications.Therefore,it is significantly important to reveal the relationship between the processing conditions and the resulting aggregated structures.This review provides a systematic understanding of how to control the aggregated structure of D−A conjugated polymer films from the fundamental mechanisms of polymer crystallization.We first discuss the possible nucleation and growth mechanisms of D−A conjugated polymers based on traditional theories or models and current findings.Then,recent progress in controlling the structure of D−A conjugated polymer films for OFETs and OECTs is reviewed.D−A conjugated polymers generally adopt chain-extended crystallization due to their strongly rigid backbone,which makes homogeneous nucleation difficult.A common strategy to control the aggregated structure of D−A conjugated polymer films is to manipulate the heterogeneous nucleation process by tuning the preaggregation.Besides,the effect of the crystallization rate and complicated conditions on the aggregated structure of D−A conjugated polymer films is also discussed.Finally,a concise summary is provided,followed by some current challenges in controlling the aggregated structure of D−A conjugated polymer films.
基金National Natural Science Foundation of China,Grant/Award Numbers:51933010,22203028。
文摘Donor–acceptor(D-A)conjugated polymers have demonstrated great potential in organicfield-effect transistors application,and their aggregated structure is a crucial factor for high charge mobility.However,the aggregated structure of D-A conjugated polymerfilms is complex and the structure–property relationship is difficult to understand.This review provides an overview of recent progress in controlling the aggregated structure of D-A conjugated polymerfilms for higher mobility,including the mechanisms,methods,and properties.Wefirst discuss the multilevel microstructures of D-A conjugated polymerfilms,and then summarize the current understanding of the relationship betweenfilm microstructures and charge transport properties.Subsequently,we review the theory of D-A conjugated polymer crystallization.After that,we summarize the common methods to control the aggregated structure of semi-crystalline and near-amorphous D-A conjugated polymerfilms,such as crystallites and aggregates,tie chains,film alignment,and attempt to understand them from the basic theory of polymer crystallization.Finally,we provide the current challenges in controlling the aggregated structure of D-A conjugated polymerfilms and in understanding the structure–property relationship.
