Monolayer organic field-effect transistors(OFETs) are attracting worldwide interest in device physics and novel applications due to their ultrathin active layer for two-dimensional charge transport. The monolayer film...Monolayer organic field-effect transistors(OFETs) are attracting worldwide interest in device physics and novel applications due to their ultrathin active layer for two-dimensional charge transport. The monolayer films are generally prepared by thermal evaporation, the Langmuir technique or self-assembly process, etc., but their electrical performance is relatively lower than corresponding thick films. From 2011, the performance of monolayer OFETs has been boosted by using the monolayer molecular crystals(MMCs) as active channels, which opened up a new era for monolayer OFETs. In this review, recent progress of monolayer OFETs, including the preparation of monolayer films, their OFET performance and applications are summarized.Finally, perspectives of monolayer OFETs in the near future are also discussed.展开更多
Two new organic crystals of 2,8-bisthienyldibenzothiophene（BTDT） and 2,8-bis-dithienyldibenzothiophene（BDTDT） compounds were successfully obtained.The change of end-capped group from thiophene to dithiophene cause...Two new organic crystals of 2,8-bisthienyldibenzothiophene（BTDT） and 2,8-bis-dithienyldibenzothiophene（BDTDT） compounds were successfully obtained.The change of end-capped group from thiophene to dithiophene causes big differences in molecular packing and carrier-transport property.The adjacent molecules of compound BTDT adopt face-to-face π stacking and exhibit two-dimensional interchain interactions.On the contrary,BDTDT molecules are arranged in an edge-to-face motif and show mainly one-dimensional interacting character.The packing mode exerts dramatic effect on the carrier-transport property.The crystal of BTDT belongs to the orthorhombic system,space group P21212 with a = 20.1427（11）,b = 4.6016（3）,c = 8.6340（5） ,V = 800.27（8） 3,Z = 2,Dc = 1.446 g/cm3,F（000） = 360,S = 1.019,the final R = 0.0491 and wR = 0.0960 for 1605 reflections with I 2σ（I）.The crystal of BDTDT belongs to the orthorhombic system,space group P212121 with a = 7.2636（15）,b = 25.359（5）,c = 25.359 ？,V = 4670.9（14） ？3,Z = 8,Dc = 1.458 g/cm3,F（000） = 2112,S = 0.880,the final R = 0.0597 and wR = 0.1318 for 8047 reflections with I 2σ（I）.展开更多
Design and synthesis of new organic functional materials with improved performance or novel properties are of great importance in the field of optoelectronics.Azulene,as a non-alternant aromatic hydrocarbon,has attrac...Design and synthesis of new organic functional materials with improved performance or novel properties are of great importance in the field of optoelectronics.Azulene,as a non-alternant aromatic hydrocarbon,has attracted rising attention in the last few years.Different from most common aromatic hydrocarbons,azulene has unique characteristics,including large dipole moment,small gap between the highest occupied molecular orbital（HOMO） and the lowest unoccupied molecular orbital（LUMO）.However,the design and synthesis of azulene-based functional materials are still facing several challenges.This review focuses on the recent development of organic functional materials employing azulene unit.The synthesis of various functionalized azulene derivatives is summarized and their applications in optoelectronics are discussed,with particular attention to the fields including nonlinear optics（NLO）,organic field-effect transistors（OFETs）,solar cells,and molecular devices.展开更多
基金supported by the Ministry of Science and Technology of China (2017YFA0204704, 2016YFB0401100)the National Natural Science Foundation of China (21805284, 21873108)the Chinese Academy of Sciences (Hundred Talents Plan and the Strategic Priority Research Program (XDB30000000, XDB12030300)
文摘Monolayer organic field-effect transistors(OFETs) are attracting worldwide interest in device physics and novel applications due to their ultrathin active layer for two-dimensional charge transport. The monolayer films are generally prepared by thermal evaporation, the Langmuir technique or self-assembly process, etc., but their electrical performance is relatively lower than corresponding thick films. From 2011, the performance of monolayer OFETs has been boosted by using the monolayer molecular crystals(MMCs) as active channels, which opened up a new era for monolayer OFETs. In this review, recent progress of monolayer OFETs, including the preparation of monolayer films, their OFET performance and applications are summarized.Finally, perspectives of monolayer OFETs in the near future are also discussed.
基金supported by the Natural Science Foundation of Shandong Province (ZR2011EMQ007)the Doctoral Foundation of Jinan University (XBS1048)
文摘Two new organic crystals of 2,8-bisthienyldibenzothiophene（BTDT） and 2,8-bis-dithienyldibenzothiophene（BDTDT） compounds were successfully obtained.The change of end-capped group from thiophene to dithiophene causes big differences in molecular packing and carrier-transport property.The adjacent molecules of compound BTDT adopt face-to-face π stacking and exhibit two-dimensional interchain interactions.On the contrary,BDTDT molecules are arranged in an edge-to-face motif and show mainly one-dimensional interacting character.The packing mode exerts dramatic effect on the carrier-transport property.The crystal of BTDT belongs to the orthorhombic system,space group P21212 with a = 20.1427（11）,b = 4.6016（3）,c = 8.6340（5） ,V = 800.27（8） 3,Z = 2,Dc = 1.446 g/cm3,F（000） = 360,S = 1.019,the final R = 0.0491 and wR = 0.0960 for 1605 reflections with I 2σ（I）.The crystal of BDTDT belongs to the orthorhombic system,space group P212121 with a = 7.2636（15）,b = 25.359（5）,c = 25.359 ？,V = 4670.9（14） ？3,Z = 8,Dc = 1.458 g/cm3,F（000） = 2112,S = 0.880,the final R = 0.0597 and wR = 0.1318 for 8047 reflections with I 2σ（I）.
基金supported by National Basic Research Program of China(973 Program,No.2012CB933102)National Natural Science Foundation of China(Nos.51525303,21233001,21190034)the Fundamental Research Funds for the Central Universities and 111 Project
文摘Design and synthesis of new organic functional materials with improved performance or novel properties are of great importance in the field of optoelectronics.Azulene,as a non-alternant aromatic hydrocarbon,has attracted rising attention in the last few years.Different from most common aromatic hydrocarbons,azulene has unique characteristics,including large dipole moment,small gap between the highest occupied molecular orbital（HOMO） and the lowest unoccupied molecular orbital（LUMO）.However,the design and synthesis of azulene-based functional materials are still facing several challenges.This review focuses on the recent development of organic functional materials employing azulene unit.The synthesis of various functionalized azulene derivatives is summarized and their applications in optoelectronics are discussed,with particular attention to the fields including nonlinear optics（NLO）,organic field-effect transistors（OFETs）,solar cells,and molecular devices.
基金supported by the National Natural Science Foundation of China(51873148,52073206,and 52273193)the Collaborative Innovation Program of Tianjin University and Qinghai Minzu University(2022TQ05)+1 种基金Tianjin Science Foundation(20JCQNJC01990)Haihe Laboratory of Sustainable Chemical Transformations。
