Current–Voltage Characteristics and Transition Voltage Spectroscopy of Individual Redox Proteins

2012 ◽  
Vol 134 (50) ◽  
pp. 20218-20221 ◽  
Author(s):  
Juan M. Artés ◽  
Montserrat López-Martínez ◽  
Arnaud Giraudet ◽  
Ismael Díez-Pérez ◽  
Fausto Sanz ◽  
...  
Keyword(s):  
Redox Proteins ◽  
Current Voltage ◽  
Current Voltage Characteristics ◽  
Transition Voltage ◽  
Transition Voltage Spectroscopy

scholarly journals Study and Analysis of Simple and Precise of Contact Resistance Single-Transistor Extracting Method for Accurate Analytical Modeling of OTFTs Current-Voltage Characteristics: Application to Different Organic Semiconductors

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1448
Author(s):  
Noweir Ahmad Alghamdi
Keyword(s):  
Contact Resistance ◽  
Organic Semiconductors ◽  
Practical Method ◽  
Organic Thin Film ◽  
Current Voltage ◽  
Organic Semiconductor Materials ◽  
Current Voltage Characteristics ◽  
Output Characteristics ◽  
P Type ◽  
Transition Voltage

Contact resistance (Rc) characterizes the interface of source-drain electrodes/organic semiconductors and controls the injection efficiency of carriers in organic thin-film transistors (OTFTs). This research paper presents and assesses two methods for extracting the value of the contact resistance from the measured current-voltage characteristics of OTFTs made with various p-type organic semiconductors as active layers. These two methods are the transition voltage method (TVM) and the transfer line method (TLM). The obtained Rc values by the TVM method are in fair agreement with those obtained by TLM, with a maximum percentage of difference around 10%, demonstrating the accuracy of the used transition-voltage method. An analytical model was employed to calculate output characteristics in the linear regime of OTFTs made with various organic semiconductors using the contact resistance values obtained by the transition voltage method. The calculated results are in reasonably good agreement with the experimental ones of each fabricated device, which affirms the ability of the used model to characterize the charge transport correctly in these types of devices. It can be concluded that the used TVM method is not only an easy and practical method, but also a precise way for extracting Rc in OTFTs produced using different organic semiconductor materials.

scholarly journals Effect of Different Sized Multi Walled Carbon Nanotubes on the Barrier Potential and Trap Concentration of Malachite Green Dye Based Organic Device

2020 ◽  
Vol 20 (4) ◽  
pp. 16-26
Author(s):  
Sudipta Sen ◽  
N. B. Manik
Keyword(s):  
Carbon Nanotubes ◽  
Malachite Green ◽  
Trap Energy ◽  
Trap Concentration ◽  
Barrier Potential ◽  
Current Voltage ◽  
Multi Walled Carbon Nanotubes ◽  
Current Voltage Characteristics ◽  
Walled Carbon Nanotubes ◽  
Transition Voltage

AbstractPresent work shows effect of 8 nm diameter and 30 nm diameter multi walled carbon nanotubes (MWCNT) on the barrier potential and trap concentration of Malachite Green (MG) dye based organic device. MWCNTs are basically a bundle of concentric single-walled carbon nanotubes with different diameters. In this work, ITO coated glass substrate and aluminium have been used as front electrode and back electrode respectively and the spin coating method is used to prepare the MG dye based organic device. It has been observed that both barrier potential and trap concentration are in correlation. Estimation of both these parameters has been done from current-voltage characteristics of the device to estimate the trap energy and the barrier potential of the device. Device turn-on voltage or the transition voltage is also calculated by using current-voltage characteristics. In presence of 8 nm diameter MWCNT, the transition voltage is reduced from 3.9 V to 2.37 V, the barrier potential is lowered to 0.97 eV from 1.12 eV and the trap energy is lowered to 0.028 eV from 0.046 eV whereas incorporation of 30 nm diameter MWCNT shows reduction of transition voltage from 3.9 V to 2.71 V and a reduction of barrier potential and trap concentration from 1.12 eV to 1.03 eV and from 0.046 eV to 0.035 eV respectively. Presence of both 8 nm diameter and 30 nm diameter MWCNT lowers trap energy approximately to 39% and 24% respectively and lowers barrier potential approximately to 13% and 8% respectively. Estimation of barrier potential is also done by Norde method which shows lowering of the value from 0.88 eV to 0.79 eV and from 0.88 eV to 0.84 eV in presence of both 8 nm and 30 nm diameter multi walled carbon nanotubes respectively. Calculation of barrier potential from both the I-V characteristics and Norde method are in unison with each other. Indication of enhancement of charge flow in the device can be ascribed to the truncated values of barrier potential and trap energy.

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