A High‐Performance Organic Field‐Effect Transistor Based on Platinum(II) Porphyrin: Peripheral Substituents on Porphyrin Ligand Significantly Affect Film Structure and Charge Mobility

Abstract

Organic field-effect transistors incorporating planar pi-conjugated metal-free macrocycles and their metal derivatives are fabricated by vacuum deposition. The crystal structures of [H2(OX)] (H(2)OX=etioporphyrin-I), [Cu(OX)], [Pt(OX)], and [Pt(TBP)] (H2TBP=tetra-(n-butyl)porphyrin) as determined by single crystal X-ray diffraction (XRD), reveal the absence of occluded solvent molecules. The field-effect transistors (FETs) made from thin films of all these metal-free macrocycles and their metal derivatives show a p-type semiconductor behavior with a charge mobility (mu) ranging from 10(-6) to 10(-1) cm(2) V(-1) s(-1). Annealing the as-deposited Pt(OX) film leads to the formation of a polycrystalline film that exhibits excellent overall charge transport properties with a charge mobility of up to 3.2 x 10(-1) cm(2) V(-1) s(-1), which is the best value reported for a metalloporphyrin. Compared with their metal derivatives, the field-effect transistors made from thin films of metal-free macrocycles (except tetra-(n-propyl)porphycene) have significantly lower mu values (3.0 x 10(-6)-3.7 x 10(-5) cm(2) V(-1) s(-1)).

Influence of annealing temperature on structural and optical properties of nanocrystalline Platinum octaethylporphyrin (PtOEP) thin films

“…Therefore, the deduced indexing can be accepted and the PtOEP lattice as Triclinic with space group P The values of Miller indices, (hkl) for each diffraction peak together with the interplanar spacing, (d hkl ) obtained by using CHECKCELL program [24]. The obtained results are very close to the results reported in the literature [25][26][27][28][29]. XRD patterns of as-deposited and annealed thin films are shown in Fig.…”

Zinc(II) Tetraphenylporphyrin on Ag(100) and Ag(111): Multilayer Desorption and Dehydrogenation

“…2 Additionally, porphyrins are extremely versatile molecules that can be utilized to probe a variety of topics such as supramolecular chemistry, 3 biomimetic redox and rearrangement catalysis, 4 and molecular electronics such as organic light emitting diodes, 5 field-effect transistors, [6][7][8][9][10][11][12][13] and dye-sensitized solar cells. 14,15 One particularly interesting porphyrin derivative is tetraphenylporphyrin (TPP), which consists of a porphyrin macrocycle with four phenyl moieties bound to the carbon bridge between adjacent pyrrole groups, as shown in Figure 1a.…”

Organic Semiconductors for Field-Effect Transistors

“…However, cyclic triphenylamine [212,213]. Annealing the as-deposited 182 film leads to the formation of a polycrystalline film which exhibited excellent overall charge transport properties with a charge mobility of up to 0.32 cm 2 V −1 s −1 [214]. [215,216].…”