Extremely-high-density carrier injection and transport over 12000A∕cm2 into organic thin films

2005 ◽  
Vol 86 (8) ◽  
pp. 083502 ◽  
Author(s):  
Hidetoshi Yamamoto ◽  
Hiroki Kasajima ◽  
Wataru Yokoyama ◽  
Hiroyuki Sasabe ◽  
Chihaya Adachi
Keyword(s):  
Thin Films ◽  
Organic Thin Films ◽  
High Density ◽  
Carrier Injection

scholarly journals Carrier Induced Hopping to Band Conduction in Pentacene

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Varsha Rani ◽  
Pramod Kumar ◽  
Akanksha Sharma ◽  
Sarita Yadav ◽  
Budhi Singh ◽  
...  
Keyword(s):  
Thin Films ◽  
Charge Transport ◽  
Carrier Mobility ◽  
Density Functional ◽  
Energy Levels ◽  
Organic Thin Films ◽  
High Density ◽  
Hopping Transport ◽  
Gaussian Density ◽  
Band Conduction

AbstractCharge transport in organic thin films which are generally polycrystalline is typically limited by the localization of the carriers at lattice defects resulting in low carrier mobilities and carriers move from one state to another state by hopping. However, charge transport in organic semiconductors in their single crystalline phase is coherent due to band conduction and mobilities are not limited by disorder resulting in higher carrier mobility. So it is a challenge to enhance the carrier mobility in a thin film which is the preferred choice for all organic devices. Here, we show that it is possible to increase the carrier mobility in polycrystalline thin films by injecting sufficient carriers such that Fermi level can be moved into the region of high density in Gaussian density of states of molecular solids. When the hopping transport happens through the molecular energy levels whose density is low, mobility is decided by incoherent transport however, when the the hopping transport happens through the energy levels with high density, mobility is decided by coherent transport, as in band conduction. We present results highlighting the observation of both band-like and hopping conduction in polycrystalline organic thin films by varying the concentration of injected charge. More importantly the transition from hopping to band transport is reversible. The observed carrier mobilities in both the regimes match well with theoretical estimates of hopping mobility and band mobility determined from first principles density functional theory.

Formation of Ohmic Carrier Injection at Anode/organic Interfaces and Carrier Transport Mechanisms of Organic Thin Films

2009 ◽  
Vol 1154 ◽  
Author(s):  
Toshinori Matsushima ◽  
Guang-He Jin ◽  
Yoshihiro Kanai ◽  
Tomoyuki Yokota ◽  
Seiki Kitada ◽  
...  
Keyword(s):  
Thin Films ◽  
Indium Tin Oxide ◽  
Carrier Transport ◽  
Organic Thin Films ◽  
Hole Transport ◽  
Transport Layer ◽  
Hole Injection ◽  
Hole Transport Layer ◽  
Zero Field ◽  
Carrier Injection

AbstractWe have shown that hole mobilities of a wide variety of organic thin films can be estimated using a steady-state space-charge-limited current (SCLC) technique due to formation of Ohmic hole injection by introducing a very thin hole-injection layer of molybdenum oxide (MoO3) between an indium tin oxide anode layer and an organic hole-transport layer. Organic hole-transport materials used to estimate hole mobilities are 4,4′,4″-tris(N-3-methylphenyl-N-phenyl-amino)triphenylamine (m-MTDATA), 4,4′,4″-tris(N-2-naphthyl-N-phenyl-amino)triphenylamine (2-TNATA), rubrene, N,N′-di(m-tolyl)-N,N′-diphenylbenzidine (TPD), and N,N′-diphenyl-N,N′-bis(1-naphthyl)-1,1′-biphenyl-4,4′-diamine (α-NPD). These materials are found to have electric-field-dependent hole mobilities. While field dependence parameters (β) estimated from SCLCs are almost similar to those estimated using a widely used time-of-flight (TOF) technique, zero field SCLC mobilities (μ0) are about one order of magnitude lower than zero field TOF mobilities.

Charge carrier injection and transport in organic thin films

2008 ◽  
Author(s):  
Toshinori Matsushima ◽  
Guang-He Jin ◽  
Yoshihiro Kanai ◽  
Tomoyuki Yokota ◽  
Seiki Kitada ◽  
...  
Keyword(s):  
Thin Films ◽  
Charge Carrier ◽  
Organic Thin Films ◽  
Carrier Injection ◽  
Charge Carrier Injection

The effects of metallic contacts on the lasing characteristics of organic thin films

2020 ◽  
Vol 13 (4) ◽  
pp. 866-872
Author(s):  
HAO Ya-ru ◽  
◽  
◽  
DENG Zhao-qi
Keyword(s):  
Thin Films ◽  
Organic Thin Films ◽  
Metallic Contacts

Optical properties of organic thin films of 4-tricyanovinyl-N, N-diethylaniline

2009 ◽  
Vol 48 (2) ◽  
pp. 20402 ◽  
Author(s):  
M. M. El-Nahass ◽  
K. F. Abd-El-Rahman ◽  
A. A. A. Darwish
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Organic Thin Films
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