Bulletin of the American Physical Society
APS March Meeting 2010
Volume 55, Number 2
Monday–Friday, March 15–19, 2010; Portland, Oregon
Session W16: Focus Session: Organic Electronics and Photonics: Transistors and Light Emitting Devices |
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Sponsoring Units: DMP DPOLY Chair: Lynn Loo, Princeton University Room: B115 |
Thursday, March 18, 2010 11:15AM - 11:51AM |
W16.00001: Microstructural Effects on Charge Transport in Organic Semiconductors Invited Speaker: |
Thursday, March 18, 2010 11:51AM - 12:03PM |
W16.00002: Characterization of Soluble Anthradithiophene Derivatives Brad Conrad, Calvin Chan, Marsha Loth, John Anthony, David Gundlach We will discuss the growth and electrical measurements of a newly developed, partially fluorinated anthradithiophene (F-ADT) derivative with tert-butyldiphenylsilyl (TBDMS) side groups. Single crystals of the material can be readily grown and device hole mobility is shown to exceed 0.05 cm$^{2}$/Vs with on/off ratios of 10$^7$. F- TBDMS ADT is also observed to be readily soluble with films spun cast onto surface treated SiO$_2$ displaying a mobility $>$0.002 cm$^2$/Vs. These electrical measurements will be correlated with growth, morphology, and the performance of related F-ADT derivatives. [Preview Abstract] |
Thursday, March 18, 2010 12:03PM - 12:15PM |
W16.00003: Amorphous Dithenylcyclopentadienone-Carbazole copolymer for Organic Thin-Film Transistors E. Kang, J. Yuen, W. Walker, N. Coates, S. Cho, E. Kim, F. Wudl We developed a new high performance amorphous donor-acceptor conjugated copolymer consisting dithienylcylclopentadienone subunit as an electron acceptor and carbazole derivative as an electron donor. X-ray diffraction analysis shows no scattering patterns, indicating a disordered amorphous solid is formed. A high on/off current ratio of approximately 10$^{6}$ and a high field effect mobility of 2.24\times$10$^{-2}$ cm$^{2}$ V$^{-1}$s$^{-1}$ were obtained with stable output characteristics. The high performance of the amorphous copolymer is ascribed to the relatively low activation energy and low characteristic temperature obtained from a low temperature transport analysis, reflecting that localization of the charge carrier is not substantial in the film. [Preview Abstract] |
Thursday, March 18, 2010 12:15PM - 12:27PM |
W16.00004: ABSTRACT WITHDRAWN |
Thursday, March 18, 2010 12:27PM - 12:39PM |
W16.00005: Infrared Electro-Optic Response of TIPS-Pentacene Thin Film Field Effect Transistors E.G. Bittle, J.W. Brill, J.E. Anthony We have used tunable infrared diode lasers to measure changes in the reflectance of bis-triisopropylsilylethynyl (TIPS) pentacene crystals, solution cast on different dielectrics, when voltages are applied to the FET gates. Relative changes in reflectance as large as 0.05{\%} are observed and can be characterized in terms of ``up-shifts'' of TIPS-pentacene phonon frequencies as well as broadband changes in reflectance with application of gate voltage. The relative changes vary either linearly or quadratically with gate voltage, depending on the crystal thickness. With application of a drain current, the relative change in reflectance (for thick crystals) varies linearly with position between the source and drain electrodes, indicating that the optical changes are due to the local gate electric field. For thin crystals, the electro-optic response is sluggish, taking $\sim $ 1ms to develop. [Preview Abstract] |
Thursday, March 18, 2010 12:39PM - 12:51PM |
W16.00006: Origin of the bias stress instability in single-crystal OFETs Vitaly Podzorov, Bumsu Lee, Daniel Mastrogiovanni, Alan Wan, Eric Garfunkel We report on the electrical transport and UPS measurements of organic single-crystal field-effect transistors that reveal the mechanism of the bias stress effect in these devices. Data on several compounds will be presented. [Preview Abstract] |
Thursday, March 18, 2010 12:51PM - 1:03PM |
W16.00007: Electrical and structural characterization of high performance airbrushed organic thin film transistors Calvin Chan, Lee Richter, Cherno Jaye, Brad Conrad, Hyun Wook Ro, David Germack, Daniel Fischer, Dean DeLongchamp, David Gundlach High performance airbrushed organic thin film transistors were demonstrated and characterized using electrical and structural methods. For example, high molecular weight poly-3-hexylthiophene (P3HT) transistors exhibited an average saturation regime mobility $>$0.02 cm$^{2}$V$^{-1}$s$^{-1}$, which is comparable to the best mobilities observed for transistors of this material prepared using other methods. Complex droplet and film formation dynamics were inferred, and the resulting film structure was observed using optical microscopy, atomic force microscopy, near-edge x-ray absorption find structure spectroscopy, and grazing incidence x-ray diffraction. [Preview Abstract] |
Thursday, March 18, 2010 1:03PM - 1:15PM |
W16.00008: Sensing with electrochemical transistors Fabio Cicoira, George G. Malliaras Organic electrochemical transistors are particularly promising for applications in chemical and biological sensing and are expected to play a primary role in the emerging field of organic bioelectronics [1]. These devices can be operated in aqueous electrolytes as ion-to-electron converters, thus providing an interface between the worlds of biology and electronics. OECTs sensors are currently able to detect micromolar analyte concentrations. Besides their application in sensing, OECT can help understanding the distribution of ions at the interface between conducting polymers and electrolytes.Of particular interest is the ratio between ions that accumulate at the surface vs. ions that enter in the polymer film, as this ratio ultimately determines the ease with which a conducting polymer can be de-doped (hence, it controls the maximum detectable analyte concentration). We addressed this issue by using energy dispersive X-ray spectroscopy to study the change in chemical composition of the conducting polymers PEDOT:PSS upon application of a gate bias in presence of several electrolytes. [1] F. Cicoira, M. Sessolo, O. Yaghmazadeh, J. A. DeFranco, S. Y. Yang, G. G. Malliaras, Adv. Mater. 2009, 21 (in press). [Preview Abstract] |
Thursday, March 18, 2010 1:15PM - 1:27PM |
W16.00009: ABSTRACT WITHDRAWN |
Thursday, March 18, 2010 1:27PM - 1:39PM |
W16.00010: Controlling Emission Zone in Blue OLEDs by Material Design Asanga Padmaperuma, Evgueni Polikarpov, James Swensen, Lelia Cosimbescu, Phillip Koech, Liang Wang The blue component is one of the remaining challenges for the organic light emitting devices (OLED) based solid-state lighting technology. OLEDs have the potential to generate solid state white lighting with 50{\%} power conversion efficiency. However realizing this potential will require optimization of not only blue emitter dopants but also host matrices. Charge balance is a key factor in achieving high quantum efficiency and low operating voltage in OLED devices. In this work, we studied the effect of the chemical structure of the phosphine oxide-based hosts and electron transport materials on the location of the emission zone. We observed that a strong domination of one carrier within the host results in highly localized emission zones in OLEDs. As a result, an alteration of the chemical design of the materials allows for the control of the emissive region location within the EML. By chemical modification of the host molecule, we achieved a relocation of the emissive zone in blue OLEDs from the EML/ETL interface to the EML/HTL interface. [Preview Abstract] |
Thursday, March 18, 2010 1:39PM - 1:51PM |
W16.00011: Polymerizable ionic liquids for fixed junction light-emitting electrochemical cells Ilya Kosilkin, Matt Martens, Michael Murphy, Janelle Leger Fixed junction light-emitting electrochemical cells (LECs) have been shown to offer several advantages over traditional dynamic junction LECs. Recently we have reported fixed junction LECs that use ion-pair monomers (IPMs) in order to eliminate counterionic mobility. However, the materials presented in our previous work had poor miscibility of IPMs with electroluminescent polymers and poor ion dissociation/mobility. Here we report on the synthesis and performance of polymerizable ionic liquids (PILs) as candidates for ionic charge carriers in LEC device structures. PILs are advantageous since they combine the improved materials properties of ionic liquids with the fixed-junction functionality of IPMs. Devices employing PILs had uniform film morphology and showed diode-like behavior. In addition, brightness was improved by an order of magnitude compared to IPM based devices reported earlier. The materials developed here, besides having advantages in LECs, may also find utility in additional applications in which control over ionic mobility or electrochemical doping is crucial. [Preview Abstract] |
Thursday, March 18, 2010 1:51PM - 2:03PM |
W16.00012: Quantum Dot Light-emitting Electrochemical Cells Amanda Norell Bader, Janelle Leger Semiconducting polymers have enormous potential to expand the applications of electronic and optoelectronic technologies. While polymer optoelectronic devices have been successful, they typically suffer from poor performance and stability. Quantum dots (QDs) boast size-tunable band-gap energies and improved stability over organic emitters , but their efficacy in a typical hybrid LED structure is limited by an insulating surface ligand layer that increases the charge tunneling barrier and leads to unwanted emission from the polymer host. Typically, hybrid LEDs are constructed with a monolayer of QDs in order to overcome this limitation. A polymer light-emitting electrochemical cell (LEC) structure, however, presents an alternative solution by limiting the thickness of the emissive region of the polymer/QD film. Emission spectra of novel LEC structures incorporating QDs as the active emitter show better color purity than polymer-only devices, as well as pure emission from the QDs, regardless of operation voltage. This device structure has the potential to improve a number of issues currently limiting the performance of polymer based optoelectronic devices. [Preview Abstract] |
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