Trap-controlled hole transport in small molecule organic semiconductors

2007 ◽  
Vol 91 (24) ◽  
pp. 242103 ◽  
Author(s):  
Arne Fleissner ◽  
Hanna Schmid ◽  
Christian Melzer ◽  
Heinz von Seggern
Keyword(s):  
Organic Semiconductors ◽  
Small Molecule ◽  
Hole Transport

scholarly journals Origin of Hole Transport in Small Molecule Dilute Donor Solar Cells

2021 ◽  
pp. 2000042
Author(s):  
Waldemar Kaiser ◽  
Lakshmi N. S. Murthy ◽  
Chin‐Lung Chung ◽  
Ken‐Tsung Wong ◽  
Julia W.P. Hsu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Hole Transport

Star-shaped organic semiconductors with planar triazine core and diketopyrrolopyrrole branches for solution-processed small-molecule organic solar cells

2015 ◽  
Vol 115 ◽  
pp. 35-49 ◽  
Author(s):  
Sheng-Yi Shiau ◽  
Chun-Ho Chang ◽  
Wei-Jen Chen ◽  
Hsing-Ju Wang ◽  
Ru-Jong Jeng ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Semiconductors ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Solution Processed

Strong piezoresistance effect of small molecule organic semiconductors

2008 ◽  
Vol 41 (20) ◽  
pp. 205106 ◽  
Author(s):  
Gao-Yu Zhong ◽  
Yu Liu ◽  
Jia Song ◽  
Qing Zhao ◽  
Yue-Sheng Li ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Small Molecule

scholarly journals Análisis de la característica corriente-voltaje de diodos orgánicos emisores de luz (OLEDs) basados en polímeros depositados por spin coating.

2010 ◽  
Vol 15 (1) ◽  
pp. 68 ◽  
Author(s):  
Henry Alberto Méndez-Pinzón ◽  
Diana Rocío Pardo-Pardo ◽  
Juan Pablo Cuéllar-Alvarado ◽  
Juan Carlos Salcedo-Reyes ◽  
Ricardo Vera ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Spin Coating ◽  
Electrical Response ◽  
Thermionic Emission ◽  
Hole Transport ◽  
Organic Layer ◽  
Electric Response ◽  
Carrier Injection ◽  
Parasitic Currents ◽  
Spin Coater

<p>Polymer-based organic light-emitting diodes (OLEDs) with the structure ITO / PEDOT:PSS / MDMO-PPV / Metal were prepared by spin coating. It is known that electroluminescence of these devices is strongly dependent on the material used as cathode and on the deposition parameters of the polymer electroluminescent layer MDMO-PPV. <strong>Objective.</strong> In this work the effect of i) the frequency of the spin coater (1000-8000 rpm), ii) the concentration of the MDMO-PPV: Toluene solution, and iii) the material used as cathode (Aluminium or Silver) on the electrical response of the devices, was evaluated through current-voltage (I-V) measurements. <strong>Materials and methods</strong>. PEDOT:PPS and MDMO-PPV organic layers were deposited by spin coating on ITO substrates, and the OLED structure was completed with cathodes of aluminium and silver. The electric response of the devices was evaluated based on the I-V characteristics. <strong>Results.</strong> Diodes prepared with thinner organic films allow higher currents at lower voltages; this can be achieved either by increasing the frequency of the spin coater or by using concentrations of MDMO-PPV: Toluene lower than 2% weight. A fit of the experimental data showed that the diodes have two contributions to the current. The first one is attributed to parasitic currents between anode and cathode, and the other one is a parallel current through the organic layer, in which the carrier injection mechanism is mediated by thermionic emission. <strong>Conclusions.</strong> The results fitting and the energy level alignment through the whole structure show that PPV-based OLEDs are unipolar devices, with current mainly attributed to hole transport.</p> <p><strong>Key words:</strong> organic semiconductors, OLEDs, electroluminescent polymers, MDMO-PPV, PEDOT:PSS, Spin coating, HOMO, LUMO, carrier injection, thermionic emission.</p><br />

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