University of Groningen Manipulation of charge carrier injection into organic field-effect transistors by self-assembled monolayers of alkanethiols

Charge carrier injection into two semiconducting polymers is investigated in field-effect transistors using gold source and drain electrodes that are modified by self-assembled monolayers of alkanethiols and perfluorinated alkanethiols. The presence of an interfacial dipole associated with the molecular monolayer at the metal/semiconductor interface changes the work function of the electrodes, and, hence, the injection of the charge carriers. The FET characteristics are analysed with the transfer line method and the hole injection into poly(2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylene vinylene) (MEH-PPV) and regio-regular poly(3-hexyl)thiophene (rr-P3HT) is investigated. The device parameters are corrected for the contact resistances of the electrodes and the mobilities of the polymers (MEH-PPV, μFET = 4 × 10−4 cm2 V−1 s−1 and rr-P3HT, μFET = (1–2) × 10−2 cm2 V−1 s−1) are determined. The contact resistance obtained for the SAM-modified electrodes is at least one order of magnitude larger than for untreated contacts.

[1]  D. A. Corley,et al.  Controlling charge injection in organic field-effect transistors using self-assembled monolayers. , 2006, Nano letters.

[2]  N. Koch,et al.  Tuning the hole injection barrier height at organic/metal interfaces with (sub-) monolayers of electron acceptor molecules , 2005 .

[3]  G. Whitesides,et al.  Self-assembled monolayers of thiolates on metals as a form of nanotechnology. , 2005, Chemical reviews.

[4]  B. de Boer,et al.  Tuning of Metal Work Functions with Self‐Assembled Monolayers , 2005 .

[5]  Dago M. de Leeuw,et al.  Charge carrier density dependence of the hole mobility in poly(p-phenylene vinylene) , 2004 .

[6]  Zhenan Bao,et al.  Metallic contact formation for molecular electronics: interactions between vapor-deposited metals and self-assembled monolayers of conjugated mono- and dithiols. , 2004, Langmuir : the ACS journal of surfaces and colloids.

[7]  P. Blom,et al.  Unification of the hole transport in polymeric field-effect transistors and light-emitting diodes. , 2003, Physical review letters.

[8]  Richard H. Friend,et al.  Close look at charge carrier injection in polymer field-effect transistors , 2003 .

[9]  Gang-yu Liu,et al.  Structures of Annealed Decanethiol Self-Assembled Monolayers on Au(111): an Ultrahigh Vacuum Scanning Tunneling Microscopy Study , 2003 .

[10]  Gerwin H. Gelinck,et al.  Scaling behavior and parasitic series resistance in disordered organic field-effect transistors , 2003 .

[11]  P. Blom,et al.  Local charge carrier mobility in disordered organic field-effect transistors , 2003 .

[12]  P. Blom,et al.  Electro-optical properties of a polymer light-emitting diode with an injection-limited hole contact , 2003 .

[13]  T. M. Klapwijk,et al.  Switch-on voltage in disordered organic field-effect transistors , 2002 .

[14]  M. Hara,et al.  Final Phase of Alkanethiol Self-Assembled Monolayers on Au(111) , 2002 .

[15]  C. Dimitrakopoulos,et al.  Organic Thin Film Transistors for Large Area Electronics , 2002 .

[16]  T. Jackson,et al.  Pentacene TFT with improved linear region characteristics using chemically modified source and drain electrodes , 2001, IEEE Electron Device Letters.

[17]  Anna B. Chwang,et al.  Field Effect Transport Measurements on Single Grains of Sexithiophene: Role of the Contacts , 2000 .

[18]  P. Calas,et al.  Synthesis of terminally perfluorinated long-chain alkanethiols, sulfides and disulfides from the corresponding halides , 2000 .

[19]  John P. Ferraris,et al.  MEH-PPV: Improved synthetic procedure and molecular weight control , 2000 .

[20]  E. W. Meijer,et al.  Two-dimensional charge transport in self-organized, high-mobility conjugated polymers , 1999, Nature.

[21]  M. Grätzel,et al.  Self-assembled monolayers as interfaces for organic opto-electronic devices , 1999 .

[22]  R. Hsung,et al.  Tuning the Work Function of Gold with Self-Assembled Monolayers Derived from X−[C6H4−C⋮C−]nC6H4−SH (n = 0, 1, 2; X = H, F, CH3, CF3, and OCH3) , 1999 .

[23]  H. Sirringhaus,et al.  Integrated optoelectronic devices based on conjugated polymers , 1998, Science.

[24]  Smith,et al.  Controlling Schottky energy barriers in organic electronic devices using self-assembled monolayers. , 1996, Physical review. B, Condensed matter.

[25]  P. Fenter,et al.  Chain-length dependence of the structures and phases of CH3(CH2)n-1 SH self-assembled on Au(111). , 1993, Physical review letters.