Mobility overestimation due to minority carrier injection and trapping in organic field-effect transistors
| Autor: | Takayuki Okachi |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Transistor model
Materials science Hardware_PERFORMANCEANDRELIABILITY 02 engineering and technology Electron 010402 general chemistry 01 natural sciences law.invention Biomaterials law Hardware_INTEGRATEDCIRCUITS Materials Chemistry Electrical and Electronic Engineering chemistry.chemical_classification business.industry Transistor General Chemistry Polymer 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Electronic Optical and Magnetic Materials Semiconductor chemistry Pinch Optoelectronics Field-effect transistor 0210 nano-technology business Voltage |
| Zdroj: | Organic Electronics. 57:34-44 |
| ISSN: | 1566-1199 |
| DOI: | 10.1016/j.orgel.2018.02.034 |
| Popis: | Donor–acceptor (D–A) polymers are promising candidates as semiconductors in flexible transistors because of their high mobility. However, in recent studies on D–A polymer transistors, device characteristics deviate from the idealized transistor model, which is commonly used for extracting mobility, and show an abrupt turn-on in the drain current when measured as a function of gate voltage. To examine the validity of the reported mobility values of D–A polymers, we investigate the detailed mechanism of the nonideal electrical characteristics by device simulation based on a split-channel model, where the gate voltage swing on the drain side is higher than that on the source side. We demonstrate that minority carriers injected into low-bandgap D–A polymers (electrons in the case of usual D–A polymers) at high drain voltages and low gate voltages cause insufficient pinch off, resulting in an overestimation of mobility if the conventional mobility extraction method is used. A more reliable method for estimating mobility from the nonideal transfer characteristics is developed and applied to recent reports. It was determined that the mobility values of D–A polymers in the recent reports were overestimated by a factor of 1.7–94 or more. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect