Special Issue "Organic Semiconductors"
A special issue of Electronics (ISSN 2079-9292).
Deadline for manuscript submissions: closed (15 January 2014)
Dr. Mohan Jacob
Electronic Materials Research Lab, School of Engineering and Physical Sciences, James Cook University, Townsville 4811, Australia
Phone: +61 (0)7 4781 4379
Fax: +61 (0)7 4781 6788
Interests: electronic materials; organic semiconductors; superconductors; dielectric materials; microwave characterisation of superconductors and dielectric materials; LTCC and MEMS; superconducting filters; polymer thin films; plasma polymerisation
Organic Semiconductors: Past, Present and Future
Over the last few years Organic Semiconducting industry showed significant growth in many areas dominated by conventional electronics. The foremost advantage of organic materials is that they are cheap, lightweight and flexible. In addition, the fabrication of organic materials from a defined molecular precursor using inkjet−printing technology is simple, bypassing the need for advanced semiconductor processing techniques. Organic thin films have already found confirmed and reliable applications in flexible displays, solar cells and biomedical applications, including implantable devices. Low cost materials, compatible with current organic electronic fabrication techniques and which improve device performance are in strong demand.
This special issue of Organic Semiconductors will cover Materials, Fabrication Techniques, Characterization, Devices and market adoption of Organic Semiconductors. This special issue will publish both original research papers and review papers in the field of research.
Dr. Mohan Jacob
Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. Papers will be published continuously (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.
Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are refereed through a peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Electronics is an international peer-reviewed Open Access quarterly journal published by MDPI.
Please visit the Instructions for Authors page before submitting a manuscript. For the first couple of issues the Article Processing Charge (APC) will be waived for well-prepared manuscripts. English correction and/or formatting fees of 250 CHF (Swiss Francs) will be charged in certain cases for those articles accepted for publication that require extensive additional formatting and/or English corrections.
- organic field effect transistors
- organic light emitting diodes
- organic solar cells
- implantable devices
- flexible electronics
- charge transport
- charge transporting materials
Review: Integration of Organic Light Emitting Diodes and Organic Photodetectors for Lab-on-a-Chip Bio-Detection Systems
Electronics 2014, 3(1), 43-75; doi:10.3390/electronics3010043
Received: 11 December 2013; in revised form: 15 January 2014 / Accepted: 27 January 2014 / Published: 13 February 2014| Download PDF Full-text (1089 KB) | Download XML Full-text
Article: Morphology, Electrical Performance and Potentiometry of PDIF-CN2 Thin-Film Transistors on HMDS-Treated and Bare Silicon Dioxide
Electronics 2014, 3(1), 76-86; doi:10.3390/electronics3010076
Received: 21 January 2014; in revised form: 14 February 2014 / Accepted: 17 February 2014 / Published: 24 February 2014| Download PDF Full-text (456 KB) | Download XML Full-text
Article: Effects of Germanium Tetrabromide Addition to Zinc Tetraphenyl Porphyrin / Fullerene Bulk Heterojunction Solar Cells
Electronics 2014, 3(1), 112-121; doi:10.3390/electronics3010112
Received: 15 January 2014; in revised form: 1 February 2014 / Accepted: 24 February 2014 / Published: 4 March 2014| Download PDF Full-text (747 KB) | Download XML Full-text
Article: Improvement in the Lifetime of Planar Organic Photovoltaic Cells through the Introduction of MoO3 into Their Cathode Buffer Layers
Electronics 2014, 3(1), 122-131; doi:10.3390/electronics3010122
Received: 11 January 2014; in revised form: 14 February 2014 / Accepted: 24 February 2014 / Published: 6 March 2014| Download PDF Full-text (255 KB) | Download XML Full-text
Review: Electron and Hole Transport Layers: Their Use in Inverted Bulk Heterojunction Polymer Solar Cells
Electronics 2014, 3(1), 132-164; doi:10.3390/electronics3010132
Received: 8 January 2014; in revised form: 19 February 2014 / Accepted: 24 February 2014 / Published: 6 March 2014| Download PDF Full-text (3424 KB)
The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.
Type of Paper: Review
Title: A Review of Laser-Induced Forward Transfer for Printing of Organic Semiconductor thin Films
Author: James Shaw-Stewart
Affiliation: Grant Institute, University of Edinburgh, The King's Buildings, Edinburgh EH9 3JW, United Kingdom
Abstract: The widespread use of organic semiconductor devices in daily life requires a reliable way of creating patterned structures of miniature devices to compete with inorganic devices. Since the best organic semiconducting materials do not currently exhibit the same mechanical and electrical properties as inorganic semiconductors, more complex layered devices are needed, thinner, and they cannot be made using traditional photoresist lithographic technology. One option is to print the devices, and a number of different methods have been tried, including ink-jet, screen printing, spray printing, stamping, and patterned evaporation/sublimation/sputtering. Solution-based techniques lead the way as a good balance between cost efficiency (much cheaper than evaporative-based techniques), and film quality. However, laser-based printing techniques have greater potential, even if the route to success appears more complex. Lasers are faster, can provide higher resolutions, and can be applied in more ways, to more materials, than solution-based techniques. Our particular focus here is on a laser-based technique known as laser-induced forward transfer (LIFT). We will focus particularly on LIFT where the thin-films are transferred intact, which theoretically allows for greater flexibility in the materials that it may be applied to, but will consider all forms of LIFT in different areas. We will consider the studies in four different sections: LIFT of general organic semiconducting and conducting films; LIFT of organic light-emitting diodes (OLED); LIFT of organic thin-film transistors (OTFTs); and LIFT of organic photovoltaics (OPVs). We will focus on the resultant semiconducting properties of the printed organic semiconductor thin films, and discuss how they compare with equivalent techniques, and the best conventionally fabricated examples.
Type of Paper: Review
Title: Effects of different electron-phonon couplings on spectral and transport properties of small molecule single-crystal organic semiconductors
Authors: C.A. Perroni, V. Marigliano Ramaglia, and V. Cataudella
Affiliation: CNR-SPIN and Physics Department, Università Federico II Napoli Via Cinthia, I-80126 Napoli
Abstract: The role of the coupling between charge carriers and low frequency intermolecular modes leading to a modulation of the particle hopping integral has been theoretically investigated in small molecule organic semiconductors used in single-crystal field-effect transistors. Analytical and numerical approaches have been used to study the resulting adiabatic models with varying electron-phonon coupling and temperature. With increasing temperature, the chemical potential moves into the tail of the density of states corresponding to localized states, but this is not enough to drive the system into an insulating state. At the same time, the width of the spectral functions gets larger and larger, making the approximation of a quasi-particle less accurate. The mobility along different crystallographic directions has been calculated, including vertex corrections that give rise to a transport lifetime one order of magnitude smaller than the spectral lifetime of the states involved in the transport mechanism. The mobility always exhibits a power-law behavior as a function of temperature in agreement with experiments in rubrene. Effects of electron coupling to both high frequency intramolecular and low frequency intermolecular vibrational modes on the transport properties have been investigated providing an accurate description of the mobility of oligoacenes as a function of temperature. Moreover, the combined effect of bulk and interface electron-phonon couplings on the transport properties has been studied in systems gated with polarizable dielectrics. While the bulk electron-phonon interaction affects the behavior of mobility in the coherent regime below room temperature, the interface coupling is dominant for the activated high temperature contribution of localized polarons. In order to improve the description of the transport properties, the presence of disorder is needed in addition to electron-phonon couplings. The effects of a weak disorder largely increase the activation energies of mobility and induce the small polaron formation at lower values of electron-phonon couplings in the experimentally relevant temperature window.
Type of Paper: Review
Title: Biodegradable Organic Electronics – their Requirements and Propects to become a Success
Author: Beatrice Beyer
Affiliation: Fraunhofer Institution for Organics, Materials and Eletronic Devices Dresden (COMEDD), Maria-Reiche-Str. 2, 01109 Dresden, Germany
Abstract: Organic electronics are widely used in thin film technology and penetrate increasingly the market since their production reliability has been realized. Potentially cheap production will allow mass market applications, but also the enhancing consumption of resources will lead to increasing waste disposal. Since sustainability issues have to be addressed more and more in the near future, research efforts are rising to bring organic electronics to their next level: biodegradabilty as demanding property which will allow the efficient use of regrowing resources. However, several requirements have to be fulfilled to achieve this characteristic level. This review will present a detailed overview about recently reported concepts, still open questions and will give an outlook about their implementation chances in future markets.
Type of Paper: Review
Title: Bandgap Science of Organic Semiconductor Films for Solar Cell Application
Authors: Masahiro Hiramoto, Masayuki Kubo, Yusuke Shinmura, Toshihiko Kaji
Affiliation: Institute for Molecular Science, Myodaiji, Okazaki 444-8787, Japan
Abstract: pn-control techniques by impurity doping both for single and co-deposited films consisting of two kinds of organic semiconductors were established. MoO3 and Cs2CO3 were used as acceptor and donor dopants, respectively. Band-bending that occurs at the interfaces of doped organic semiconductor films was mapped by using Kelvin probe. Observed doping efficiency will be discussed based on the ionization efficiency. A series of fundamental junctions such as Schottky junctions, pn-homojunctions, p+, n+/metal ohmic junctions, n+p+-ohmic homojunctions, and tandem cells showing 2.4% efficiency were fabricated in the co-deposited organic semiconductor films by impurity doping only.
Type of Paper: Article
Title: Top-emitting organic light-emitting diodes with nanostructured electrodes: Optimizing efficiency by optical modeling
Authors: R. Pfeifer 1, K. Fehse 1, U. Vogel 1, K. Leo 2
1 Fraunhofer Institution for Organics, Materials and Eletronic Devices Dresden (COMEDD), Maria-Reiche-Str. 2, 01109 Dresden, Germany
2 Institut für Angewandte Photophysik, TU Dresden, 01062 Dresden, Germany
Abstract: Top-emitting organic light-emitting diodes are used i.a. for microdisplay applications. High luminous efficacy is desired not only for use in daylight environments. The external quantum efficiency is limited to around 75% due to the low light outcoupling efficiency in planar organic stacks. Nanostructuring the electrodes is proposed to enhance the light outcoupling efficiency by diffraction effects. We report on a theoretical framework to model the light emission within periodically structured thin-film stacks and employ this to optimize a grating anode with high refractive index contrast. The proposed anode design ensures a planar electrode-organic interface to preserve stack topology.
Title: Electron Transport Layers and Hole Transport Layers: their use in Inverted Bulk Heterojunction Polymer Solar Cell
Author: Sandro Lattante
Affiliation: University of Salento, Italy; E-Mail: firstname.lastname@example.org
Abstract: The Bulk Heterojunction Polymer Solar Cells (BHJ PSC) are very promising organic-based devices for low cost solar energy conversion, compatible with roll-to-roll or general printing methods for mass production. Nevertheless to date many issues should still be addressed, one of these being the poor stability in ambient condition. One elegant way to overcome such an issue is the so called ‘’inverted’’ BHJ PSC, a device geometry in which the charge collection is reverted in comparison with the standard geometry device, i.e. the electrons are collected by the bottom electrode and the holes by the top electrode (in contact with air). This reverted geometry allows to use a high work function top metal electrode like silver or gold (thus avoiding its fast oxidation and degradation) and eliminates the need of a polymeric hole transport layer typically of acidic nature on top of the transparent metal oxide bottom electrode. Moreover this geometry is fully compatible with standard roll-to-roll manufacturing in air and is less demanding for a good post-production encapsulation process. To date the external power conversion efficiencies of the inverted devices are generally comparable to their standard analogues, once both the electron transport layer and hole transport layer are fully optimized for the particular device. Here the most recent results on this particular optimization processes will be reviewed and a general outlook of the Inverted BHJ PSC will be depicted.
Last update: 30 December 2013