scholarly journals Arylenevinylene Oligomer-Based Heterostructures on Flexible AZO Electrodes

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7688
Author(s):  
Anca Stanculescu ◽  
Marcela Socol ◽  
Oana Rasoga ◽  
Carmen Breazu ◽  
Nicoleta Preda ◽  
...  
Keyword(s):  
Grain Shape ◽  
Zinc Phthalocyanine ◽  
Visible Range ◽  
Flexible Substrates ◽  
Transparent Conductor ◽  
Electrical Behavior ◽  
Type Layer ◽  
Roughness Exponent ◽  
P Type ◽  
A Current

We investigated the optical and electrical properties of flexible single and bi-layer organic heterostructures prepared by vacuum evaporation with a p-type layer of arylenevinylene oligomers, based on carbazole, 3,3′ bis(N hexylcarbazole)vinylbenzene = L13, or triphenylamine, 1,4 bis [4 (N,N’ diphenylamino)phenylvinyl] benzene = L78, and an n-type layer of 5,10,15,20-tetra(4-pyrydil)21H,23H-porphyne = TPyP. Transparent conductor films of Al-doped ZnO (AZO) with high transparency, >90% for wavelengths >400 nm, and low resistivity, between 6.9 × 10−4 Ωcm and 23 × 10−4 Ωcm, were deposited by pulsed laser deposition on flexible substrates of polyethylene terephthalate (PET). The properties of the heterostructures based on oligomers and zinc phthalocyanine (ZnPc) were compared, emphasizing the effect of the surface morphology. The measurements revealed a good absorption in the visible range of the PET/AZO/arylenevinylene oligomer/TPyP heterostructures and a typical injection contact behavior with linear (ZnPc, L78) or non-linear (L13) J-V characteristics in the dark, at voltages <0.4 V. The heterostructure PET/AZO/L78/TPyP/Al showed a current density of ~1 mA/cm2 at a voltage of 0.3 V. The correlation between the roughness exponent, evaluated from the height-height correlation function, grain shape, and electrical behavior was analyzed. Consequently, the oligomer based on triphenylamine could be a promising replacement of donor ZnPc in flexible electronic applications.

First-Principles Evaluation of the Potential of Borophene as a Monolayer Transparent Conductor

2017 ◽  
Author(s):  
Lyudmyla Adamska ◽  
Sridhar Sadasivam ◽  
Jonathan J. Foley ◽  
Pierre Darancet ◽  
Sahar Sharifzadeh
Keyword(s):  
First Principles ◽  
Density Functional ◽  
State Of The Art ◽  
Transparent Electrode ◽  
Visible Range ◽  
Two Dimensional ◽  
Transparent Conductor ◽  
Many Body ◽  
Functional Theory ◽  
Many Body Perturbation Theory

Two-dimensional boron is promising as a tunable monolayer metal for nano-optoelectronics. We study the optoelectronic properties of two likely allotropes of two-dimensional boron using first-principles density functional theory and many-body perturbation theory. We find that both systems are anisotropic metals, with strong energy- and thickness-dependent optical transparency and a weak (<1%) absorbance in the visible range. Additionally, using state-of-the-art methods for the description of the electron-phonon and electron-electron interactions, we show that the electrical conductivity is limited by electron-phonon interactions. Our results indicate that both structures are suitable as a transparent electrode.

Ultraviolet light-emitting diodes with polarization-doped p-type layer

2016 ◽  
Vol 97 ◽  
pp. 353-357 ◽  
Author(s):  
Wenxiao Hu ◽  
Ping Qin ◽  
Weidong Song ◽  
Chongzhen Zhang ◽  
Rupeng Wang ◽  
...  
Keyword(s):  
Ultraviolet Light ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Type Layer ◽  
P Type ◽  
Ultraviolet Light Emitting Diodes

scholarly journals Increased efficiency in pn-junction PbS QD solar cells via NaHS treatment of the p-type layer

2017 ◽  
Vol 110 (10) ◽  
pp. 103904 ◽  
Author(s):  
Mark J. Speirs ◽  
Daniel M. Balazs ◽  
Dmitry N. Dirin ◽  
Maksym V. Kovalenko ◽  
Maria Antonietta Loi
Keyword(s):  
Solar Cells ◽  
Pn Junction ◽  
Type Layer ◽  
P Type

scholarly journals Electronic Sensing Platform (ESP) Based on Open-Gate Junction Field-Effect Transistor (OG-JFET) for Life Science Applications: Design, Modeling and Experimental Results

Sensors ◽  
2021 ◽  
Vol 21 (22) ◽  
pp. 7491
Author(s):  
Abbas Panahi ◽  
Deniz Sadighbayan ◽  
Ebrahim Ghafar-Zadeh
Keyword(s):  
Field Effect ◽  
Field Effect Transistor ◽  
Comsol Multiphysics ◽  
Subtle Difference ◽  
Back Gate ◽  
Sensing Platform ◽  
Type Layer ◽  
Type Contact ◽  
Effect Transistor ◽  
P Type

This paper presents a new field-effect sensor called open-gate junction gate field-effect transistor (OG-JFET) for biosensing applications. The OG-JFET consists of a p-type channel on top of an n-type layer in which the p-type serves as the sensing conductive layer between two ohmic contacted sources and drain electrodes. The structure is novel as it is based on a junction field-effect transistor with a subtle difference in that the top gate (n-type contact) has been removed to open the space for introducing the biomaterial and solution. The channel can be controlled through a back gate, enabling the sensor’s operation without a bulky electrode inside the solution. In this research, in order to demonstrate the sensor’s functionality for chemical and biosensing, we tested OG-JFET with varying pH solutions, cell adhesion (human oral neutrophils), human exhalation, and DNA molecules. Moreover, the sensor was simulated with COMSOL Multiphysics to gain insight into the sensor operation and its ion-sensitive capability. The complete simulation procedures and the physics of pH modeling is presented here, being numerically solved in COMSOL Multiphysics software. The outcome of the current study puts forward OG-JFET as a new platform for biosensing applications.

Synthesis of visible-light-absorptive and hole-transporting periodic mesoporous organosilica thin films for organic solar cells

2014 ◽  
Vol 2 (30) ◽  
pp. 11857-11865 ◽  
Author(s):  
Masamichi Ikai ◽  
Yoshifumi Maegawa ◽  
Yasutomo Goto ◽  
Takao Tani ◽  
Shinji Inagaki
Keyword(s):  
Thin Films ◽  
Solar Cells ◽  
Visible Light ◽  
Organic Solar Cells ◽  
Mesoporous Films ◽  
Periodic Mesoporous Organosilica ◽  
Mesoporous Organosilica ◽  
Type Layer ◽  
Hole Transporting ◽  
P Type

Mesoporous films containing 4,7-dithienyl-2,1,3-benzothiadiazole units in the frameworks were synthesized and demonstrated to function as a p-type layer for organic solar cells by filling an n-type PCBM in the mesopores.

Ohmic and Rectifying Contacts on High Resistivity P-Type Cadmium Telluride

1982 ◽  
Vol 16 ◽  
Author(s):  
A. Musa ◽  
J.P. Ponpon ◽  
M. Hage-Ali
Keyword(s):  
Cadmium Telluride ◽  
Current Flow ◽  
Electrical Characterization ◽  
High Resistivity ◽  
Experimental Conditions ◽  
Low Leakage ◽  
Low Leakage Current ◽  
Gold Contact ◽  
P Type ◽  
A Current

ABSTRACTOhmic and rectifying contacts on high resistivity etched P-type cadmium telluride have been studied in order to produce diode structures.For this,we have first investigated the properties of gold contacts obtained by chemical reactions of CdTe dippedin gold chloride.Both electrical characterization and structure have been analyzed as a function of the experimental conditions of the contact deposition.The results can be interpreted in terms of a current flow enhanced by tunnelling through the Au-CdTe junction and related to the structure of the interface a few tens of nanometer below the gold contact. In addition,several rectifying contacts have been investigated , in order to achieve a structure having low leakage current.

ORGANIC PHOTODIODES ON PRINTED ITO COATINGS

2011 ◽  
Vol 20 (04) ◽  
pp. 787-799 ◽  
Author(s):  
ANJA HAASE ◽  
ELKE KRAKER ◽  
JOACHIM KRENN ◽  
CHRISTIAN PALFINGER ◽  
SABINE HEUSING ◽  
...  
Keyword(s):  
Bottom Electrode ◽  
Copper Phthalocyanine ◽  
Type Material ◽  
Visible Range ◽  
Oxygen Plasma Treatment ◽  
Plastic Substrates ◽  
Current Voltage ◽  
Gas Atmosphere ◽  
Solution Cast ◽  
P Type

We describe the fabrication and characterization of organic photodiodes on solution cast ITO (tin doped indium oxide) bottom electrodes. ITO coatings were produced by gravure printing process on PET and PEN substrates. The sheet resistance could be decreased by heat treatment at 120°C under forming gas atmosphere ( N 2/ H 2) to 1.5 kΩ. The transmission of the ITO coated PET and PEN substrates is more than 80% in the visible range. The printed films were hardened under UV-irradiation at low temperatures (< 130°C) and used as the bottom electrode of an organic photodiode (OPD), consisting of a stacked layer of copper phthalocyanine ( p -type material), perylene tetracarboxylic bisbenzimidazole ( n -type material) and Aluminium tris(8-hydroxyquinoline). The performance of the photodiodes with printed ITO on plastic substrates could be improved by adding a smoothing layer of PEDOT/PSS (Baytron® P) on the ITO coated films and was then similar to the performance of photodiodes with semi-transparent gold as anode. These results demonstrate the suitability of the printed ITO layers as bottom electrode for organic photodiodes. Furthermore the influence of different treatments (forming gas and oxygen plasma treatment) of the ITO bottom electrode on the current-voltage characteristics of the OPDs was studied.

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