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Disordered Self Assembled Monolayer Dielectric Induced Hysteresis in Organic Field Effect Transistors

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Title Disordered Self Assembled Monolayer Dielectric Induced Hysteresis in Organic Field Effect Transistors
 
Creator PADMA, N
SAXENA, V
SUDARSAN, V
RAVAL, H
SEN, S
 
Subject OFET
Copper Phthalocyanine
Drain Current-Drain Voltage Characteristics
Hysteresis
Scan Speed
THIN-FILM TRANSISTORS
 
Description A memory device using an organic field effect transistor (OFET) with copper phthalocyanine (CuPc) as active material was fabricated and studied. For this purpose, SiO2 dielectric surface was modified with a disordered self assembled monolayer (SAM) of octadecyltrichlorosilane (OTS) molecule which was found to induce large disorder in CuPc film thereby generating more traps for charge carriers. Drain current-drain voltage characteristics at zero gate voltage exhibited large hysteresis which was not observed in OFET devices with ordered OTS monolayer modified and unmodified SiO2 dielectrics. The extent of hysteresis and drain current on/off ratio, reading voltage etc. were found to be dependent on the sweep rate/step voltage employed during scanning. Highest hysteresis with on/off ratio of about 240 was obtained for an optimum step voltage of 2 V while it decreased with further reduction in the same. This was attributed to the longer scanning time leading to release of trapped carriers during forward scan itself. The OFET device was found to exhibit excellent memory retention capability where OFF and ON current measured for about 2 hours after stressing the device at write and erase voltages showed good retention of on/off ratio.
 
Publisher AMER SCIENTIFIC PUBLISHERS
 
Date 2014-12-28T13:02:47Z
2014-12-28T13:02:47Z
2014
 
Type Article
 
Identifier JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 14(6)4418-4423
1533-4880
1533-4899
http://dx.doi.org/10.1166/jnn.2014.8200
http://dspace.library.iitb.ac.in/jspui/handle/100/16650
 
Language English