Organic field-effect transistors based on J-aggregate thin films of a bisazomethine dye

Macroscopic crystalline deformation in an organic dye during reversible phase transition caused by alkyl disorder

“…N,N'-bis [4-(N,N-diethylamino)benzylidene]diaminomaleonitrile (DE2) 25 (Sheme S1, ESI †) formed J-aggregates in thin deposited films and can be further applied to organic solar cells and fieldeffect transistors. [26][27][28][29][30][31][32] Its crystal structure analysis indicated that DE2 undergoes a structural phase transition at a low temperature (LT, 93 K). 33 The volume of the unit cell at LT is twice that of a room temperature (RT, 293 K) phase, and the number of molecules in the unit cell changes from Z = 3 (Z′ = 1.5) to Z = 6 (Z′= 3).…”

The effect of terminal dimethyl and diethyl substituents on the J-aggregate-like molecular arrangement of bisazomethine dye molecules

“…Possible applications of these films include organic semiconductors and field-effect transistors. [23][24][25][26] However, these DE2 films also include non-aggregated solid phases, and these are responsible for the broad absorptions seen at shorter wavelengths. 27 In order to solve this problem, novel bisazomethine dyes have been synthesised [28][29][30][31] based on the reported crystal structures of DE2 and other bisazomethine dyes [32][33][34][35] and the proposed structural models of J-aggregates.…”

“…This can guide the molecular design of bisazomethine dyes. [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] Also, the relationship between substitution and the bulk structure can be extended to design organic compounds used in semiconductors. [36][37][38]…”

Exciton transport and electron mobility of organized aggregates of cationic dye thiocyanates

“…1,2 Transport of excitons is greatly facilitated in organized molecular assemblies, notably J-aggregates where the transition dipole moments are strongly coupled. [3][4][5][6][7] The properties of J-aggregates of organic molecules, especially those of dyes have been extensively investigated, both experimentally and theoretically, opening up novel optoelectronic device concepts. The possibilities of adopting J-aggregates in solar cells, [8][9][10] photon detectors, 11 electroluminescent devices, 12,13 excitonic transistors 5,14 and switches, 15 lasing systems and microcavity devices 13 continue to attract much attention.…”

“…[3][4][5][6][7] The properties of J-aggregates of organic molecules, especially those of dyes have been extensively investigated, both experimentally and theoretically, opening up novel optoelectronic device concepts. The possibilities of adopting J-aggregates in solar cells, [8][9][10] photon detectors, 11 electroluminescent devices, 12,13 excitonic transistors 5,14 and switches, 15 lasing systems and microcavity devices 13 continue to attract much attention. Familiar photovoltaic and photoconductive photon detectors are based on inorganic semiconductors.…”