A series of D-π-A, D-π-D, and A-π-A
based push–pull
compounds with triarylamine and benzophenone were designed and synthesized
for nonvolatile memory applications. All of the compounds showed good
solubility in common organic solvents, which permits solution processability.
D-π-A based compounds exhibited write-once-read-many (WORM)
memory applications, and the compound with a methoxyphenyl substituent
exhibited switching with a low threshold voltage of −0.82 V,
an ON/OFF current ratio of 102, and a long-lasting retention
time of 103 s. The effect of differently functionalized
triarylamines on memory behavior was explored by optical, electrochemical,
and computational studies. The highest HOMO levels of around ∼5.0
eV and irreversible anodic peaks (0.7–1.3 V) obtained for the
compounds facilitate charge injection and switching behavior. Besides,
electrochemical and density functional theory studies disclose the
charge-transfer mechanism of the D-π-A systems, which is related
to the bistability of the devices.
Facile and efficient solution-processed bottom gate top contact organic field-effect transistor was fabricated by employing the active layer of picene (donor, D) and N,N′-di(dodecyl)-perylene-3,4,9,10-tetracarboxylic diimide (acceptor, A). Balanced hole (0.12 cm2/Vs) and electron (0.10 cm2/Vs) mobility with Ion/off of 104 ratio were obtained for 1:1 ratio of D/A blend. On increasing the ratio of either D or A, the charge carrier mobility and Ion/off ratio improved than that of the pristine molecules. Maximum hole (µmax,h) and electron mobilities (µmax,e) were achieved up to 0.44 cm2/Vs for 3:1 and 0.25 cm2/Vs for 1:3, (D/A) respectively. This improvement is due to the donor phase function as the trap center for minority holes and decreased trap density of the dielectric layer, and vice versa. High ionization potential (− 5.71 eV) of 3:1 and lower electron affinity of (− 3.09 eV) of 1:3 supports the fine tuning of frontier molecular orbitals in the blend. The additional peak formed for the blends at high negative potential of − 1.3 V in cyclic voltammetry supports the molecular level electronic interactions of D and A. Thermal studies supported the high thermal stability of D/A blends and SEM analysis of thin films indicated their efficient molecular packing. Quasi-π–π stacking owing to the large π conjugated plane and the crystallinity of the films are well proved by GIXRD. DFT calculations also supported the electronic distribution of the molecules. The electron density of states (DOS) of pristine D and A molecules specifies the non-negligible interaction coupling among the molecules. This D/A pair has unlimited prospective for plentiful electronic applications in non-volatile memory devices, inverters and logic circuits.
A series of new triarylamine appended alkoxyphenanthrenes connected through acetylene bridges were synthesized for high-performance p-channel OFETs. These semiconductors exhibited high-lying HOMO energy levels up to -5.16 eV, enabling hole-transporting...
New arylacetylene end-capped alkoxyphenanthrenes were synthesized and demonstrated as the best active layer for solution-processable p-channel organic field-effect transistors. The alkoxy chain embedded compounds exhibited enhanced solubility and induced non-covalent interactions resulting in effective molecular packing. The 'Lewis soft' heteroatoms direct the most stable conformation with dihedral angles possible for molecular interactions, and energy levels. DFT studies supported the fine-tuning of FMOs, with high HOMO levels À 5.2 eV ensuring a low barrier for charge injection. OFET devices exhibited a maximum charge carrier mobility up to 1.30 cm 2 /Vs with the highest ON/OFF ratio of 10 7 . The strong ππ interactions and the crystallinity of the films are well supported by GIXRD and SEM analysis.
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