Titanyl phthalocyanine ambipolar thin film transistors making use of carbon nanotube electrodes

The capability of efficiently injecting charge carriers into organic films and finely tuning their morphology and structure is crucial to improve the performance of organic thin film transistors (OTFTs). In this work, we investigate OTFTs employing carbon nanotubes (CNTs) as the source-drain electrodes and, as the organic semiconductor, thin films of titanyl phthalocyanine (TiOPc) grown by supersonic molecular beam deposition (SuMBD). While CNT electrodes have shown an unprecedented ability to improve charge injection in OTFTs, SuMBD is an effective technique to tune film morphology and structure. Varying the substrate temperature during deposition, we were able to grow both amorphous (low substrate temperature) and polycrystalline (high substrate temperature) films of TiOPc. Regardless of the film morphology and structure, CNT electrodes led to superior charge injection and transport performance with respect to benchmark Au electrodes. Vacuum annealing of polycrystalline TiOPc films with CNT electrodes yielded ambipolar OTFTs.

[1]  W. Xie,et al.  Utilizing carbon nanotube electrodes to improve charge injection and transport in bis(trifluoromethyl)-dimethyl-rubrene ambipolar single crystal transistors. , 2013, ACS nano.

[2]  Rong Zhang,et al.  Field-effect transistors based on two-dimensional materials for logic applications , 2013 .

[3]  R. Martel,et al.  Carbon nanotube electrodes in organic transistors. , 2013, Nanoscale.

[4]  S. Khondaker,et al.  Thermionic emission and tunneling at carbon nanotube-organic semiconductor interface. , 2012, ACS nano.

[5]  H. Sirringhaus,et al.  Enhanced ambipolar charge injection with semiconducting polymer/carbon nanotube thin films for light-emitting transistors. , 2012, ACS nano.

[6]  R. Martel,et al.  Organic photonics: Spotlight on organic transistors , 2011 .

[7]  S. Iannotta,et al.  Ambipolar copper phthalocyanine transistors with carbon nanotube array electrodes , 2011 .

[8]  R. Martel,et al.  Making contacts to n-type organic transistors using carbon nanotube arrays. , 2011, ACS nano.

[9]  A. Rinzler,et al.  Non‐Volatile Organic Memory Elements Based on Carbon‐Nanotube‐Enabled Vertical Field‐Effect Transistors , 2010 .

[10]  K. Walzer,et al.  Controlled Polymorphism in Titanyl Phthalocyanine on Mica by Hyperthermal Beams: A Micro-Raman Analysis , 2010 .

[11]  M. Steigerwald,et al.  Current Trends in Shrinking the Channel Length of Organic Transistors Down to the Nanoscale , 2010, Advanced materials.

[12]  Hong Wang,et al.  Optimizing molecular orientation for high performance organic thin film transistors based on titanyl phthalocyanine , 2009 .

[13]  Karen Willcox,et al.  Kinetics and kinematics for translational motions in microgravity during parabolic flight. , 2009, Aviation, space, and environmental medicine.

[14]  A. Pallaoro,et al.  Supersonic molecular beams deposition of α-quaterthiophene: Enhanced growth control and devices performances , 2009 .

[15]  William R. Salaneck,et al.  Energy‐Level Alignment at Organic/Metal and Organic/Organic Interfaces , 2009 .

[16]  R. Martel,et al.  Carbon nanotubes as injection electrodes for organic thin film transistors. , 2009, Nano letters.

[17]  Richard Martel,et al.  The Role of the Oxygen/Water Redox Couple in Suppressing Electron Conduction in Field‐Effect Transistors , 2009 .

[18]  N. Armstrong,et al.  Titanyl phthalocyanine/C60 heterojunctions: Band-edge offsets and photovoltaic device performance , 2008 .

[19]  J. Brédas,et al.  Theoretical characterization of titanyl phthalocyanine as a p-type organic semiconductor: short intermolecular pi-pi interactions yield large electronic couplings and hole transport bandwidths. , 2008, The Journal of chemical physics.

[20]  K. Walzer,et al.  Polymorphism and phase control in titanyl phthalocyanine thin films grown by supersonic molecular beam deposition. , 2007, The journal of physical chemistry. A.

[21]  P. Avouris,et al.  Carbon-based electronics. , 2007, Nature nanotechnology.

[22]  Liqiang Li,et al.  An Ultra Closely π‐Stacked Organic Semiconductor for High Performance Field‐Effect Transistors , 2007 .

[23]  Phaedon Avouris,et al.  Nanotube electronics and optoelectronics , 2006 .

[24]  S. Ravi P. Silva,et al.  Interpenetrating multiwall carbon nanotube electrodes for organic solar cells , 2006 .

[25]  W. R. Salaneck,et al.  Energetics at Au top and bottom contacts on conjugated polymers , 2006 .

[26]  Ricardo Izquierdo,et al.  Carbon nanotube sheets as electrodes in organic light-emitting diodes. , 2006 .

[27]  James Hone,et al.  Covalently Bridging Gaps in Single-Walled Carbon Nanotubes with Conducting Molecules , 2006, Science.

[28]  Qian Wang,et al.  Miniature organic transistors with carbon nanotubes as quasi-one-dimensional electrodes. , 2004, Journal of the American Chemical Society.

[29]  Y. Aoyagi,et al.  Pentacene nanotransistor with carbon nanotube electrodes , 2004 .

[30]  A. Locatelli,et al.  Work functions of individual single-walled carbon nanotubes , 2004 .

[31]  J. C. Scott,et al.  Metal–organic interface and charge injection in organic electronic devices , 2003 .

[32]  Kazumi Matsushige,et al.  Quasi-intrinsic semiconducting state of titanyl-phthalocyanine films obtained under ultrahigh vacuum conditions , 2000 .

[33]  S. Iannotta,et al.  Supersonic seeded beams of thiophene based oligomers for preparing films of controlled quality , 1999 .

[34]  T. Iwayanagi,et al.  Photocarrier generation processes of phthalocyanines studied by photocurrent and electroabsorption measurements , 1993 .

[35]  K. Oka,et al.  Study of the Crystal Structure of Titanylphthalocyanine by Rietveld Analysis and Intermolecular Energy Minimization Method , 1992 .

[36]  Salvatore Iannotta,et al.  Cluster Beam Synthesis of Nanostructured Materials , 1999 .