Controlling charge injection by self-assembled monolayers in bottom-gate and top-gate organic field-effect transistors

Gholamrezaie, Fatemeh; Asadi, Kamal; Kicken, Romero A. H. J.; Langeveld-Voss, B.M.W.; Leeuw, Dago M. de; Blom, Paul W. M.

doi:10.1016/j.synthmet.2011.08.020

Cited by 11 publications

(2 citation statements)

References 44 publications

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“…In contrast, a terminal with halogen atoms having a large electronegativity (-CF 3 , -Cl, -Br, -COOH) increase the work function because their dipole moments are in the same direction as that of the M-S dipole (negative sign) [12,54,57,59,60]. Hence, alkanethiols are regarded as suitable for reducing the electron injection barrier (w m decreases to 4.1 eV), whereas perfluorinated thiols are useful for improving hole injection (w m increases to 5.8 eV) [26,[58][59][60][61][62][63][64][65]. In designing SAMs, modifying the tail groups are more effective than changing the docking for tuning w m (Fig.…”

Section: Improving Injection Via Self-assembled Monolayer Dipole Formmentioning

confidence: 99%

Contact engineering in organic field-effect transistors

2015

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Organic field-effect transistors (OFETs) are promising for numerous potential applications but suffer from poor charge injection, such that their performance is severely limited. Recent efforts in lowering contact resistance have led to significantly improved field-effect mobility of OFETs, up to 100 times higher, as the results of careful choice of contact materials and/or chemical treatment of contact electrodes. Here we review the innovative developments of contact engineering and focus on the mechanisms behind them. Further improvement toward Ohmic contact can be expected along with the rapid advance in material research, which will also benefit other organic and electronic devices.

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Section: Improving Injection Via Self-assembled Monolayer Dipole Formmentioning

confidence: 99%

Contact engineering in organic field-effect transistors

2015

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“…[18] SAM of PentaFluoro Ben-zeneThiol (PFBT) and PerFluoro DecaneThiol (PFDT) have enabled increased electrode efficiency in OFETs of solution processed OSC. [13,[19][20][21] However, limited studies have been done to explore their effect on R C of Cu electrodes in OFETs of evaporated molecular OSCs.…”

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confidence: 99%

Charge Carrier Doping As Mechanism of Self‐Assembled Monolayers Functionalized Electrodes in Organic Field Effect Transistors

Patrikar

Bothra

Rao

et al. 2021

Adv Materials Inter

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Coating electrodes with self‐assembled monolayer (SAM) of polar molecules is known to reduce contact resistance (RC) in organic field effect transistors (OFETs). It is shown that the behavior of SAM in OFETs can be explained by considering a mechanism of interfacial doping in organic semiconductor by electrodes due to charge transfer during interface formation. The enhancement is analyzed in performance of pentacene OFETs with Cu electrodes, by coating Cu with SAM of pentafluorobenzenethiol or perfluorodecanethiol. It is found that application of either SAM leads to an increase in work function of Cu surface. However, work function shift due to SAM does not correlate with trends in RC and OFET drain current. Further, first principle calculations reveal a notable difference in delocalization of frontal orbitals with either SAM, an indicator of the difference in ease of charge transfer across interface. Based on the mechanism of interfacial doping, a semiconductor physics model is developed for estimating interface doping and injection barrier, and for predicting the consequent device characteristics. It is believed that the model and methodology developed in this study can be utilized beyond the SAM and semiconductor system used here.

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Highly Stable Contact Doping in Organic Field Effect Transistors by Dopant‐Blockade Method

Kim

Broch

Lee

et al. 2020

Adv Funct Materials

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In organic device applications, a high contact resistance between metal electrodes and organic semiconductors prevents an efficient charge injection and extraction, which fundamentally limits the device performance. Recently, various contact doping methods have been reported as an effective way to resolve the contact resistance problem. However, the contact doping has not been explored extensively in organic field effect transistors (OFETs) due to dopant diffusion problem, which significantly degrades the device stability by damaging the ON/OFF switching performance. Here, the stability of a contact doping method is improved by incorporating "dopant-blockade molecules" in the poly(2,5-bis(3-hexadecylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT) film in order to suppress the diffusion of the dopant molecules. By carefully selecting the dopant-blockade molecules for effectively blocking the dopant diffusion paths, the ON/OFF ratio of PBTTT OFETs can be maintained over 2 months. This work will maximize the potential of OFETs by employing the contact doping method as a promising route toward resolving the contact resistance problem.

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Controlling charge injection by self-assembled monolayers in bottom-gate and top-gate organic field-effect transistors

Abstract: Controlling charge injection by self-assembled monolayers in bottom-gate and top-gate organic field-effect transistors Gholamrezaie, Fatemeh; Asadi, Kamal; Kicken, Romero A. H. J.; Langeveld-Voss, Bea M. W.; de Leeuw, Dago M.; Blom, Paul W. M.

Cited by 11 publications

References 44 publications

Contact engineering in organic field-effect transistors

Contact engineering in organic field-effect transistors

Charge Carrier Doping As Mechanism of Self‐Assembled Monolayers Functionalized Electrodes in Organic Field Effect Transistors

Highly Stable Contact Doping in Organic Field Effect Transistors by Dopant‐Blockade Method

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