| 1. |
- Berggren, Magnus, et al.
(författare)
-
Ion Electron-Coupled Functionality in Materials and Devices Based on Conjugated Polymers
- 2019
-
Ingår i: Advanced Materials. - : Wiley-VCH Verlagsgesellschaft. - 0935-9648 .- 1521-4095. ; 31:22
-
Forskningsöversikt (refereegranskat)abstract
- The coupling between charge accumulation in a conjugated polymer and the ionic charge compensation, provided from an electrolyte, defines the mode of operation in a vast array of different organic electrochemical devices. The most explored mixed organic ion-electron conductor, serving as the active electrode in these devices, is poly(3,4-ethyelenedioxythiophene) doped with polystyrelensulfonate (PEDOT:PSS). In this progress report, scientists of the Laboratory of Organic Electronics at Linkoping University review some of the achievements derived over the last two decades in the field of organic electrochemical devices, in particular including PEDOT:PSS as the active material. The recently established understanding of the volumetric capacitance and the mixed ion-electron charge transport properties of PEDOT are described along with examples of various devices and phenomena utilizing this ion-electron coupling, such as the organic electrochemical transistor, ionic-electronic thermodiffusion, electrochromic devices, surface switches, and more. One of the pioneers in this exciting research field is Prof. Olle Inganas and the authors of this progress report wish to celebrate and acknowledge all the fantastic achievements and inspiration accomplished by Prof. Inganas all since 1981.
|
|
| 2. |
- Fabiano, Simone, et al.
(författare)
-
Poly(ethylene imine) impurities induce n-doping reaction in organic (semi)conductors
- 2014
-
Ingår i: Advanced Materials. - : Wiley-VCH Verlagsgesellschaft. - 0935-9648 .- 1521-4095. ; 26:34, s. 6000-6006
-
Tidskriftsartikel (refereegranskat)abstract
- Volatile impurities contained in polyethyleneimine (PEI), and identified as ethyleneimine dimers and trimers, are reported. These N-based molecules show a strong reducing character, as demonstrated by the change in electrical conductivity of organic (semi) conductors exposed to the PEI vapor. The results prove that electron transfer rather than a dipole effect at the electrode interface is the origin of the work-function modification by the PEI-based layers.
|
|
| 3. |
|
|
| 4. |
- Hamedi, Mahiar, et al.
(författare)
-
Fiber-Embedded Electrolyte-Gated Field-Effect Transistors for e-Textiles
- 2009
-
Ingår i: Advanced Materials. - : Wiley. - 0935-9648 .- 1521-4095. ; 21:5, s. 573-577
-
Tidskriftsartikel (refereegranskat)abstract
- Electrolyte-gate organic field-effect transistors embedded at the junction of textile microfibers are demonstrated. The fiber transistor operates below I V and delivers large current densities. The transience of the organic thin-film transistors current and the impedance spectroscopy measurements reveal that the channel is formed in two steps.
|
|
| 5. |
- Herlogsson, Lars, 1975-, et al.
(författare)
-
Downscaling of Organic Field-Effect Transistors with a Polyelectrolyte Gate Insulator
- 2008
-
Ingår i: Advanced Materials. - : Wiley Online. - 0935-9648 .- 1521-4095. ; 20:24, s. 4708-4713
-
Tidskriftsartikel (refereegranskat)abstract
- A polyelectrolyte is used as gate insulator material in organic field-effect transistors with self-aligned inkjet printed sub–micrometer channels. The small separation of the charges in the electric double layer at the electrolyte-semiconductor interface, which builds up in tens of microseconds, provides a very high transverse electric field in the channel that effectively suppresses short-channel effects at low applied gate voltages.
|
|
| 6. |
- Herlogsson, Lars, et al.
(författare)
-
Low-Voltage Polymer Field-Effect Transistors Gated Via a Proton Conductor
- 2007
-
Ingår i: Advanced Materials. - : Wiley Online. - 0935-9648 .- 1521-4095. ; 19:1, s. 97-
-
Tidskriftsartikel (refereegranskat)abstract
- Low operating voltages for p-channel organic field-effect transistors (OFETs) can be achieved by using an electrolyte as the gate insulator. However, mobile anions in the electrolyte can lead to undesired electrochemistry in the channel. In order to avoid this, a polyanionic electrolyte is used as the gate insulator. The resulting OFET has operating voltages of less than 1€‰V (see figure) shows fast switching (less than 0.3€‰ms) in ambient atmosphere._x000D_
|
|
| 7. |
- Herlogsson, Lars, et al.
(författare)
-
Low-Voltage Ring Oscillators Based on Polyelectrolyte-Gated Polymer Thin-Film Transistors
- 2010
-
Ingår i: Advanced Materials. - : Wiley. - 0935-9648 .- 1521-4095. ; 22:1, s. 72-76
-
Tidskriftsartikel (refereegranskat)abstract
- A polyanionic electrolyte is used as gate insulator in top-gate p-channel polymer thin-film transistors. The high capacitance of the polyelectrolyte film allows the transistors and integrated circuits to operate below 1.5 V. Seven-stage ring oscillators that operate at supply voltages down to 0.9 V and exhibit signal propagation delays as low as 300 µs per stage are reported.
|
|
| 8. |
- Herlogsson, Lars, 1975-, et al.
(författare)
-
Polyelectrolyte-Gated Organic Complementary Circuits Operating at Low Power and Voltage
- 2011
-
Ingår i: Advanced Materials. - : Wiley-Blackwell. - 0935-9648 .- 1521-4095. ; 23:40, s. 4684-
-
Tidskriftsartikel (refereegranskat)abstract
- In this work, polyanionic and polycationic electrolytes are used as gate insulators in p- and n-channel thin-film transistors, respectively. These material combinations are motivated by that the mobile ions in the electrolytes will be attracted to the oppositely charged gate electrodes when the transistors are operated in the accumulation mode. The electronic charges in the semiconductor channels will thus be balanced by the polyions, which are effectively immobile and cannot penetrate into the semiconductor bulk and cause electrochemical doping.
|
|
| 9. |
- Jia, Yanhua, et al.
(författare)
-
Wearable Thermoelectric Materials and Devices for Self-Powered Electronic Systems
- 2021
-
Ingår i: Advanced Materials. - : WILEY-V C H VERLAG GMBH. - 0935-9648 .- 1521-4095. ; 33:42
-
Forskningsöversikt (refereegranskat)abstract
- The emergence of artificial intelligence and the Internet of Things has led to a growing demand for wearable and maintenance-free power sources. The continual push toward lower operating voltages and power consumption in modern integrated circuits has made the development of devices powered by body heat finally feasible. In this context, thermoelectric (TE) materials have emerged as promising candidates for the effective conversion of body heat into electricity to power wearable devices without being limited by environmental conditions. Driven by rapid advances in processing technology and the performance of TE materials over the past two decades, wearable thermoelectric generators (WTEGs) have gradually become more flexible and stretchable so that they can be used on complex and dynamic surfaces. In this review, the functional materials, processing techniques, and strategies for the device design of different types of WTEGs are comprehensively covered. Wearable self-powered systems based on WTEGs are summarized, including multi-function TE modules, hybrid energy harvesting, and all-in-one energy devices. Challenges in organic TE materials, interfacial engineering, and assessments of device performance are discussed, and suggestions for future developments in the area are provided. This review will promote the rapid implementation of wearable TE materials and devices in self-powered electronic systems.
|
|
| 10. |
- Jiang, Qinglin, et al.
(författare)
-
High Thermoelectric Performance in n-Type Perylene Bisimide Induced by the Soret Effect
- 2020
-
Ingår i: Advanced Materials. - : WILEY-V C H VERLAG GMBH. - 0935-9648 .- 1521-4095. ; 32:45
-
Tidskriftsartikel (refereegranskat)abstract
- Low-cost, non-toxic, abundant organic thermoelectric materials are currently under investigation for use as potential alternatives for the production of electricity from waste heat. While organic conductors reach electrical conductivities as high as their inorganic counterparts, they suffer from an overall low thermoelectric figure of merit (ZT) due to their small Seebeck coefficient. Moreover, the lack of efficient n-type organic materials still represents a major challenge when trying to fabricate efficient organic thermoelectric modules. Here, a novel strategy is proposed both to increase the Seebeck coefficient and achieve the highest thermoelectric efficiency for n-type organic thermoelectrics to date. An organic mixed ion-electron n-type conductor based on highly crystalline and reduced perylene bisimide is developed. Quasi-frozen ionic carriers yield a large ionic Seebeck coefficient of -3021 mu V K-1, while the electronic carriers dominate the electrical conductivity which is as high as 0.18 S cm(-1)at 60% relative humidity. The overall power factor is remarkably high (165 mu W m(-1)K(-2)), with aZT= 0.23 at room temperature. The resulting single leg thermoelectric generators display a high quasi-constant power output. This work paves the way for the design and development of efficient organic thermoelectrics by the rational control of the mobility of the electronic and ionic carriers.
|
|
