Alternative model for injection-limited current into organic solids

Abstract. This study demonstrates an analytical relation that models the carrier injection in metal-organic interfaces and which considers two consecutive carriers hopping as the injection mechanism. The new formula has superior attributes and can surpass conventional relations, in particular the thermionic emission-diffusion formula. For example, the model can properly trace the temperature dependency of the injection up to temperatures as low as 30 K and the full range of electric fields. Also, the prominence of joule heating for proper modeling of the injection is presented. This study examines the validity of the introduced analytical equation by exploring the injection in several practical contacts extracted from the literature, the results of which are discussed in this paper.

[1]  B. G. Bagley,et al.  The field dependent mobility of localized electronic carriers , 1970 .

[2]  R. Friend,et al.  Uniaxial alignment of liquid-crystalline conjugated polymers by nanoconfinement. , 2007, Nano letters.

[3]  James J. O'Brien,et al.  Progress with Light‐Emitting Polymers , 2000 .

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

[5]  M. Sharifi,et al.  Quantitative characterization of carrier injection across metal–organic interfaces using Bardeen theory , 2012 .

[6]  Donal D. C. Bradley,et al.  Electrical transport characteristics of single-layer organic devices from theory and experiment , 2005 .

[7]  Libero Zuppiroli,et al.  Numerical model for organic light-emitting diodes , 2001 .

[8]  Vladimir Arkhipov,et al.  Charge injection into light-emitting diodes: Theory and experiment , 1998 .

[9]  M. Sharifi.  Time-dependent simulation of organic light-emitting diodes , 2009 .

[10]  M. Shin,et al.  Thermal analysis of active layer in organic thin-film transistors , 2012 .

[11]  C. McNeill,et al.  Influence of Annealing and Interfacial Roughness on the Performance of Bilayer Donor/Acceptor Polymer Photovoltaic Devices , 2010 .

[12]  C. R. Crowell,et al.  Current transport in metal-semiconductor barriers , 1966 .

[13]  S. Horng,et al.  Current injection and transport in polyfluorene , 2007 .

[14]  K. Seki,et al.  ENERGY LEVEL ALIGNMENT AND INTERFACIAL ELECTRONIC STRUCTURES AT ORGANIC/METAL AND ORGANIC/ORGANIC INTERFACES , 1999 .

[15]  Stephen R. Forrest,et al.  Interface-limited injection in amorphous organic semiconductors , 2001 .

[16]  J. Lupton.  Frequency up-conversion as a temperature probe of organic opto-electronic devices , 2002 .

[17]  A. Kahn,et al.  Chemical and electrical properties of interfaces between magnesium and aluminum and tris-(8-hydroxy quinoline) aluminum , 2001 .

[18]  George G. Malliaras,et al.  Temperature- and field-dependent electron and hole mobilities in polymer light-emitting diodes , 1999 .

[19]  I. Samuel,et al.  Modelling temperature-dependent current-voltage characteristics of an MEH-PPV organic light emitting device , 2002 .

[20]  M. W. Klein,et al.  Mobility-dependent charge injection into an organic semiconductor. , 2001, Physical review letters.

[21]  L. Zuppiroli,et al.  Simulation of charge injection enhancements in organic light-emitting diodes , 2001 .

[22]  Markus Schwoerer,et al.  Transient electroluminescence measurements on organic heterolayer light emitting diodes , 2000 .

[23]  Paul W. M. Blom,et al.  Charge transport in poly(p-phenylene vinylene) light-emitting diodes , 2000 .