Organic Thin Film Transistors for Large Area Electronics

Abstract

Organic thin‐film transistors (OTFTs) have lived to see great improvements in recent years. This review presents new insight into conduction mechanisms and performance characteristics, as well as opportunities for modeling properties of OTFTs. The shifted focus in research from novel chemical structures to fabrication technologies that optimize morphology and structural order is underscored by chapters on vacuum‐deposited and solution‐processed organic semiconducting films. Finally, progress in the growing field of the n‐type OTFTs is discussed in ample detail. The Figure, showing a pentacene film edge on SiO2, illustrates the morphology issue.

Small Molecule/Polymer Blend Organic Transistors with Hole Mobility Exceeding 13 cm2 V−1 s−1

“…[4] [13] [14] Small molecules are well-known for their high charge carrier mobilities due to their high crystallinity, however they are difficult to process from a solution-phase. [15] [16] [17] Polymers, on the other hand, offer superior solution-processing qualities and produce uniform thin-films, but they are generally characterised by lower charge carrier mobility values. [17] [18] Blending small molecules with polymers has been shown to combine the high electrical performance traditionally associated with the small molecule with the superior filmforming attributes of the polymer, leading to semiconducting systems that combine the best of both worlds.…”

“…[15] [16] [17] Polymers, on the other hand, offer superior solution-processing qualities and produce uniform thin-films, but they are generally characterised by lower charge carrier mobility values. [17] [18] Blending small molecules with polymers has been shown to combine the high electrical performance traditionally associated with the small molecule with the superior filmforming attributes of the polymer, leading to semiconducting systems that combine the best of both worlds. [13] [14] [19] The 1 st generation blend was introduced in 2009 by Hamilton et al when they blended the small-molecule 2,8-difluoro-5,11-bis(triethylsilylethynyl)anthradithiophene (diF-TES ADT) with the semiconducting polymer poly(triarylamine) (PTAA), resulting in OFETs with mobilities of 2.4 cm 2 /Vs.…”

Fingerprint of Fractional Charge Transfer at the Metal/Organic Interface

“…[13] Indeed, unsubstituted pentacene (PEN), a p-type semiconductor, is the subject of numerous investigations owing to its high charge-carrier mobility and its ability to form highly oriented thin films. [3,4,[14][15][16][17][18][19][20] These properties can be tuned, according to specific technological needs, for example, by fluorination, turning, e.g., pentacene into the ntype semiconductor perfluoropentacene. [13,21,22] In this Letter, we investigate F4PEN molecules deposited on Au(110) single crystals by using X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS), and near edge X-ray absorption fine structure (NEXAFS) spectroscopy.…”

Effect of curing conditions of a poly(4-vinylphenol)gate dielectric on the performance of a pentacene-based thin film transistor

“…[1][2][3][4] The surface characteristics of the gate dielectric strongly influence the quality of the gate dielectric-semiconductor interface hence the device performance. [5][6][7] In the last decade, considerable effort has been devoted to the fabrication of OTFTs using organic gate dielectrics [8][9][10][11][12] for use as switching devices for flexible displays. Although great advances have been made in the improvement of OTFTs using polymer gate dielectrics, there has been relatively little research into the effects of the surface energy of polymer gate dielectrics on device performance.…”