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Phase separation induced high mobility and electrical stability in organic field-effect transistors
- Source :
- Synthetic Metals. 221:186-191
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- Phase separation induced high carrier mobility and electrical stability are achieved in organic field-effect transistors using TIPS-pentacene:polystyrene blends. Rigid Si/SiO 2 substrate was especially chosen to explore the phase separation. A vertical phase separation between TIPS-pentacene and polystyrene as confirmed from scanning electron microscopic image, evetually leads to excellent carrier mobility in polymer blend devices compared to that of neat TIPS-pentacene. Maximum hole mobility improved from 0.2 cm 2 V −1 s −1 for neat TIPS-pentacene on SiO 2 to 2.6 cm 2 V −1 s −1 for TIPS-pentacene blends with PS, with average value of 1.5 cm 2 V −1 s −1 . Apart from higher mobility, TIPS-pentacene:PS blend devices also showed much lower decay in drain current (∼30%) during a constant bias-stress of 2 h, compared to neat devices (∼80%). Interestingly, This decay was fully recovered for blend devices under rest conditions. The corresponding shift in the threshold voltage due to bias-stress was lower for TIPS-pentacene:PS device due to better quality of interface as confirmed by lower values of density of interface traps and higher trapping time. High electrical stability in TIPS-pentacene:polystyrene blend devices was also supported by repeatabiliiy studies, which exhibited nearly unchanged device characteristics.
- Subjects :
- Electron mobility
Materials science
Scanning electron microscope
Analytical chemistry
02 engineering and technology
Substrate (electronics)
010402 general chemistry
01 natural sciences
law.invention
chemistry.chemical_compound
law
Materials Chemistry
Mechanical Engineering
Transistor
Metals and Alloys
021001 nanoscience & nanotechnology
Condensed Matter Physics
0104 chemical sciences
Electronic, Optical and Magnetic Materials
Threshold voltage
chemistry
Mechanics of Materials
Field-effect transistor
Polymer blend
Polystyrene
0210 nano-technology
Subjects
Details
- ISSN :
- 03796779
- Volume :
- 221
- Database :
- OpenAIRE
- Journal :
- Synthetic Metals
- Accession number :
- edsair.doi...........6fc54c7aba5dc3919da89558885d5ee4