Effects of Interfacial Charge Depletion in Organic Thin-Film Transistors with Polymeric Dielectrics on Electrical Stability
We investigated the electrical stabilities of two types of pentacene-based organic thin-film transistors (OTFTs) with two different polymeric dielectrics: polystyrene (PS) and poly(4-vinyl phenol) (PVP), in terms of the interfacial charge depletion. Under a short-term bias stress condition, the OTFT...
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doaj-979640a6c5704bf5a95f6fca47a1877e2020-11-24T23:25:42ZengMDPI AGMaterials1996-19442010-06-01363614362410.3390/ma3063614Effects of Interfacial Charge Depletion in Organic Thin-Film Transistors with Polymeric Dielectrics on Electrical StabilityJaehoon ParkJin-Hyuk BaeWon-Ho KimMin-Hoi KimChang-Min KeumSin-Doo LeeJong Sun ChoiWe investigated the electrical stabilities of two types of pentacene-based organic thin-film transistors (OTFTs) with two different polymeric dielectrics: polystyrene (PS) and poly(4-vinyl phenol) (PVP), in terms of the interfacial charge depletion. Under a short-term bias stress condition, the OTFT with the PVP layer showed a substantial increase in the drain current and a positive shift of the threshold voltage, while the PS layer case exhibited no change. Furthermore, a significant increase in the off-state current was observed in the OTFT with the PVP layer which has a hydroxyl group. In the presence of the interfacial hydroxyl group in PVP, the holes are not fully depleted during repetitive operation of the OTFT with the PVP layer and a large positive gate voltage in the off-state regime is needed to effectively refresh the electrical characteristics. It is suggested that the depletion-limited holes at the interface, i.e., interfacial charge depletion, between the PVP layer and the pentacene layer play a critical role on the electrical stability during operation of the OTFT. http://www.mdpi.com/1996-1944/3/6/3614/organic thin-film transistorsstabilitypolymerdielectricshydroxyl group |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jaehoon Park Jin-Hyuk Bae Won-Ho Kim Min-Hoi Kim Chang-Min Keum Sin-Doo Lee Jong Sun Choi |
spellingShingle |
Jaehoon Park Jin-Hyuk Bae Won-Ho Kim Min-Hoi Kim Chang-Min Keum Sin-Doo Lee Jong Sun Choi Effects of Interfacial Charge Depletion in Organic Thin-Film Transistors with Polymeric Dielectrics on Electrical Stability Materials organic thin-film transistors stability polymer dielectrics hydroxyl group |
author_facet |
Jaehoon Park Jin-Hyuk Bae Won-Ho Kim Min-Hoi Kim Chang-Min Keum Sin-Doo Lee Jong Sun Choi |
author_sort |
Jaehoon Park |
title |
Effects of Interfacial Charge Depletion in Organic Thin-Film Transistors with Polymeric Dielectrics on Electrical Stability |
title_short |
Effects of Interfacial Charge Depletion in Organic Thin-Film Transistors with Polymeric Dielectrics on Electrical Stability |
title_full |
Effects of Interfacial Charge Depletion in Organic Thin-Film Transistors with Polymeric Dielectrics on Electrical Stability |
title_fullStr |
Effects of Interfacial Charge Depletion in Organic Thin-Film Transistors with Polymeric Dielectrics on Electrical Stability |
title_full_unstemmed |
Effects of Interfacial Charge Depletion in Organic Thin-Film Transistors with Polymeric Dielectrics on Electrical Stability |
title_sort |
effects of interfacial charge depletion in organic thin-film transistors with polymeric dielectrics on electrical stability |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2010-06-01 |
description |
We investigated the electrical stabilities of two types of pentacene-based organic thin-film transistors (OTFTs) with two different polymeric dielectrics: polystyrene (PS) and poly(4-vinyl phenol) (PVP), in terms of the interfacial charge depletion. Under a short-term bias stress condition, the OTFT with the PVP layer showed a substantial increase in the drain current and a positive shift of the threshold voltage, while the PS layer case exhibited no change. Furthermore, a significant increase in the off-state current was observed in the OTFT with the PVP layer which has a hydroxyl group. In the presence of the interfacial hydroxyl group in PVP, the holes are not fully depleted during repetitive operation of the OTFT with the PVP layer and a large positive gate voltage in the off-state regime is needed to effectively refresh the electrical characteristics. It is suggested that the depletion-limited holes at the interface, i.e., interfacial charge depletion, between the PVP layer and the pentacene layer play a critical role on the electrical stability during operation of the OTFT. |
topic |
organic thin-film transistors stability polymer dielectrics hydroxyl group |
url |
http://www.mdpi.com/1996-1944/3/6/3614/ |
work_keys_str_mv |
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