Wide Energy-Window View on the Density of States and Hole Mobility in Poly(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi></mml:math>-Phenylene Vinylene)

The evolution of the density of states (DOS) and conductivity as function of well controlled doping levels in OC1C10-poly(p-phenylene vinylene) [OC1C10-PPV] doped by FeCl3 and PF6, and PF6 doped polypyrrole (PPy-PF6) have been investigated. At a doping level as high as 0.2 holes per monomer, the former one remains non-metallic, while the latter crosses the metal-insulator transition. In both systems a similar almost linear increase in DOS as function of charges per unit volume (c * ) has been observed from the electrochemical gated transistor data. In PPy-PF6, when compared to doped OC1C10-PPV, the energy states filled at low doping are closer to the vacuum level; by the higher c * at high doping more energy states are available, which apparently enables the conduction to change to metallic. Although both systems on the insulating side show log σ ∝ T −1/4 as in variable range hopping, for highly doped PPy-PF6 the usual interpretation of the hopping parameters leads to seemingly too high values for the density of states.

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“…In the EGT measurements on PPV and PPy the hole charge was counterbalanced by PF − 6 anions from the electrolyte solution. 14 …”

Section: Methodsmentioning

confidence: 99%

Doping, density of states, and conductivity in polypyrrole and poly(p-phenylene vinylene)

et al. 2005

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“…This method has been applied in many works for investigation of DOS in conducting polymers, 54,91 quantum dots, 59 and porous semiconductors. 13,82,[92][93][94] The electrochemical determination of the (10), is exponential…”

Section: Factors Affecting the Chemical Capacitancementioning

confidence: 99%

“…It is widely agreed that the distribution of electronic states in disordered organic conductors has a Gaussian shape, and this is observed by capacitance measurements. 83,91 When a conducting polymer is oxidized electrochemically, the excess carriers (holes) in the polymer chains usually lead to a molecular deformation, which causes a lowering in energy for the excess carrier. Such a carrier together with its produced molecular deformation is called a polaron (P).…”

Section: Factors Affecting the Chemical Capacitancementioning

confidence: 99%

“…160,161 It is possible to adopt an alternative expression for the mobility that includes the factor w n . 91,162 In this procedure, it is assumed that in the quasi-equilibrium situation only electrons within k B T of the Fermi level contribute significantly to the conductivity. 163,164 The effective density of carriers nˆis given by 164n…”

Section: The Einstein Relationmentioning

confidence: 99%

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Physical electrochemistry of nanostructured devices

Bisquert

2008

Phys. Chem. Chem. Phys.

244

273

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“…Although the concept is interesting and can be used for many bio-electronic applications [9], the inherent doping occurring when ions enter the OS can cause the electronic properties to degrade, which is further supported by the appearance of an hysteretic behavior in the currentvoltage (I-V) characteristics [10,11]. To minimize the doping effect, a gating through a polymeric electrolyte composed of large poly-anionic chains was proposed [10].…”

Section: Introductionmentioning

confidence: 99%

Phospholipid film in electrolyte-gated organic field-effect transistors

Cotrone

Ambrico

Toss

et al. 2012

Organic Electronics

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A totally innovative electrolyte-gated field effect transistor, embedding a phospholipid film at the interface between the organic semiconductor and the gating solution, is described. The electronic properties of OFETs including a phospholipid film are studied in both pure water and in an electrolyte solution and compared to those of an OFET with the organic semiconductor directly in contact with the gating solution. In addition, to investigate the role of the lipid layers in the charge polarization process and quantify the field-effect mobility, impedance spectroscopy was employed. The results indicate that the integration of the biological film minimizes the penetration of ions into the organic semiconductor thus leading to a capacitive operational mode as opposed to an electrochemical one. The OFETs operate at low voltages with a field-effect mobility in the 10 -3 cm 2 V -1 s -1 range and an on/off current ratio of 10 3 . This achievement opens perspectives to the development of FET biosensors potentially capable to operate in direct contact with physiological fluids.2

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Wide Energy-Window View on the Density of States and Hole Mobility in Poly(p-Phenylene Vinylene)

Cited by 179 publications

References 27 publications

Doping, density of states, and conductivity in polypyrrole and poly(p-phenylene vinylene)

Doping, density of states, and conductivity in polypyrrole and poly(p-phenylene vinylene)

Physical electrochemistry of nanostructured devices

Phospholipid film in electrolyte-gated organic field-effect transistors

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