scholarly journals Donor-Acceptor Interaction in Films of Tetracene–Tetracyanoquinodimethane Heterostructures and Composites

2018 ◽  
Vol 63 (1) ◽  
pp. 70
Author(s):  
M. P. Gorishnyi ◽  
A. B. Verbitsky
Keyword(s):  
Thin Films ◽  
Absorption Spectra ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Composite Films ◽  
Charge Transfer Complexes ◽  
Acceptor Interaction ◽  
Light Emitting ◽  
Donor Acceptor ◽  
First Time

The structures and the absorption and photovoltaic spectra of thin films of tetracene (TC) and tetracyanoquinodimethane (TCNQ), as well as the films of their heterostructures (TC/TCNQ) and composites (TC + TCNQ), have been studied. The heterostructures and composites are obtained by the thermal sputtering of the components – successively or simultaneously, respectively – in vacuum. The photovoltaic spectra were measured, by using the condenser method. It is found for the first time that the largest changes ΔD1 in the TC/TCNQ and TC + TCNQ absorption spectra with respect to the sum of the absorption spectra of the components are observed in the intervals of TCNQ dimeric bands at 2.214 eV (ΔD1 < 0) and in all TC bands (ΔD1 > 0). Those changes testify to the formation of charge transfer complexes between the TC (the electron donor) and TCNQ (the electron acceptor) molecules at the interfaces in the TC/TCNQ heterostructures and in the bulk of TC + TCNQ composites, which is also confirmed by the appearance of TC+- and TCNQ−-bands in the photovoltaic spectra of both the heterostructure and composite films. This result is important for a deeper understanding of the operating mechanisms in various potentially imaginable devices based on those heterostructures and composites (solar cells, field-effect transistors, and light-emitting diodes).

scholarly journals Oligofuran–Benzothiadiazole Co-oligomers: Synthesis, Optoelectronic Properties and Reactivity

2021 ◽  
Vol 03 (02) ◽  
pp. 303-308
Author(s):  
Dror Ben Abba Amiel ◽  
Choongik Kim ◽  
Ori Gidron
Keyword(s):  
Organic Solar Cells ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Organic Light Emitting Diodes ◽  
Organic Field Effect Transistors ◽  
Active Materials ◽  
Light Emitting ◽  
Organic Light ◽  
Donor Acceptor ◽  
Optical Bandgaps

Donor–acceptor–donor (DAD) triad systems are commonly applied as active materials in ambipolar organic field-effect transistors, organic solar cells, and NIR-emitting organic light-emitting diodes. Often, these triads utilize oligothiophenes as donors, whereas their oxygen-containing analogs, oligofurans, are far less studied in this setup. Here we introduce a family of DAD triads in which the donors are oligofurans and the acceptor is benzothiadiazole. In a combined computational and experimental study, we show that these triads display optical bandgaps similar to those of their thiophene analogs, and that a bifuran donor is sufficient to produce emission in the NIR spectral region. The presence of a central acceptor unit increases the photostability of oligofuran-based DAD systems compared with parent oligofurans of the similar length.

Light-Emitting Field-Effect Transistors Based on Composite Films of Polyfluorene and CsPbBr3 Nanocrystals

2019 ◽  
Vol 61 (2) ◽  
pp. 256-262 ◽  
Author(s):  
A. N. Aleshin ◽  
I. P. Shcherbakov ◽  
D. A. Kirilenko ◽  
L. B. Matyushkin ◽  
V. A. Moshnikov
Keyword(s):  
Field Effect ◽  
Field Effect Transistors ◽  
Composite Films ◽  
Light Emitting

Organic Materials for Large Area Electronics

2008 ◽  
Vol 608 ◽  
pp. 159-179 ◽  
Author(s):  
Richard Friend
Keyword(s):  
Thin Films ◽  
Field Effect ◽  
Organic Materials ◽  
Field Effect Transistors ◽  
Semiconductor Devices ◽  
Large Area ◽  
Active Matrix ◽  
Semiconductor Physics ◽  
Light Emitting ◽  
Wide Range

Organic materials have been developed to operate as the active semiconductor in a wide range of semiconductor devices, including light-emitting diodes, LEDs, field-effect transistors, FETs, and photovoltaic diodes, PVs. The ability to process these materials as thin films over large areas makes possible a range of applications, currently in displays, as LEDs and as active matrix FET arrays, and solar cells. This article reviews developments in semiconductor physics of these materials and in their application in semiconductor devices

scholarly journals Optical Properties of Oligo(9,9-diarylfluorene) Derivatives in Thin Films and Their Application for Organic Light-Emitting Field-Effect Transistors

2007 ◽  
Vol 111 (1) ◽  
pp. 108-115 ◽  
Author(s):  
Takahito Oyamada ◽  
Chih-Hao Chang ◽  
Teng-Chih Chao ◽  
Fu-Chuan Fang ◽  
Chung-Chih Wu ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Light Emitting ◽  
Organic Light

Ambipolar light-emitting field-effect transistors based on molecular thin films

2006 ◽  
Author(s):  
R. Capelli ◽  
F. Dinelli ◽  
M. A. Loi ◽  
M. Murgia ◽  
M. Muccini
Keyword(s):  
Thin Films ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Light Emitting ◽  
Molecular Thin Films

scholarly journals Air-stable n-channel organic field-effect transistors based on charge-transfer complexes including dimethoxybenzothienobenzothiophene and tetracyanoquinodimethane derivatives

2016 ◽  
Vol 4 (25) ◽  
pp. 5981-5987 ◽  
Author(s):  
Toshiki Higashino ◽  
Masaki Dogishi ◽  
Tomofumi Kadoya ◽  
Ryonosuke Sato ◽  
Tadashi Kawamoto ◽  
...  
Keyword(s):  
Thin Films ◽  
Charge Transfer ◽  
Single Crystals ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Charge Transfer Complexes ◽  
Organic Field Effect Transistors

Novel mixed stack charge-transfer complexes (DMeO-BTBT)(Fn-TCNQ) show air-stable n-channel transistor performance in the thin films and single crystals.

Conclusions and Future Aspects

2020 ◽  
pp. 216-222
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Drug Delivery ◽  
Solar Cell ◽  
Electrical Properties ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Physiochemical Properties ◽  
Light Emitting ◽  
The Common

Polyaniline (PANI) is one of the common and extensively explored conducting polymers due to its excellent electrochemical and electrical properties. PANI thin film is an emerging area of research owing to its various applications in the field of solar cell technologies, drug delivery, organic light emitting diodes, field-effect transistors, sensors, electrochromic displays, etc. This chapter is devoted to the conclusions and future aspects of the undertaken studies in this book. This book has eight chapters that comprise the discussion of synthesis, deposition and characterization techniques, physiochemical properties, and applications of PANI thin films.

scholarly journals Large Area Emission in p-Type Polymer-Based Light-Emitting Field-Effect Transistors by Incorporating Charge Injection Interlayers

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 901
Author(s):  
Gizem Acar ◽  
Muhammad Javaid Iqbal ◽  
Mujeeb Ullah Chaudhry
Keyword(s):  
Field Effect ◽  
Field Effect Transistors ◽  
Charge Injection ◽  
Limiting Factors ◽  
Hole Injection ◽  
Large Area ◽  
Device Structure ◽  
Light Emitting ◽  
Emission Area ◽  
P Type

Organic light-emitting field-effect transistors (LEFETs) provide the possibility of simplifying the display pixilation design as they integrate the drive-transistor and the light emission in a single architecture. However, in p-type LEFETs, simultaneously achieving higher external quantum efficiency (EQE) at higher brightness, larger and stable emission area, and high switching speed are the limiting factors for to realise their applications. Herein, we present a p-type polymer heterostructure-based LEFET architecture with electron and hole injection interlayers to improve the charge injection into the light-emitting layer, which leads to better recombination. This device structure provides access to hole mobility of ~2.1 cm2 V−1 s−1 and EQE of 1.6% at a luminance of 2600 cd m−2. Most importantly, we observed a large area emission under the entire drain electrode, which was spatially stable (emission area is not dependent on the gate voltage and current density). These results show an important advancement in polymer-based LEFET technology toward realizing new digital display applications.

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