Performance enhancement of poly(3-hexylthiophene-2,5-diyl) based field effect transistors through surfactant treatment of the poly(vinyl alcohol) gate insulator surface

We report on the improvement of field effect transistors based on poly(3-hexylthiophene-2,5-diyl) (P3HT) as a channel semiconductor and crosslinked poly(vinyl alcohol) (cr-PVA) as a gate insulator, through the treatment of the cr-PVA film surface before P3HT deposition. We treated the cr-PVA either...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2015-01, Vol.17 (40), p.26530-26534
Main Authors: Nawaz, Ali, Cruz-Cruz, Isidro, Rodrigues, Rafael, Hümmelgen, Ivo A
Format: Article
Language:English
Subjects:
Alcohols
Capacitance
Chromium
Field effect transistors
Gates
Insulators
Semiconductor devices
Semiconductors
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Summary:We report on the improvement of field effect transistors based on poly(3-hexylthiophene-2,5-diyl) (P3HT) as a channel semiconductor and crosslinked poly(vinyl alcohol) (cr-PVA) as a gate insulator, through the treatment of the cr-PVA film surface before P3HT deposition. We treated the cr-PVA either with hydrochloric acid (HCl) or with a cationic surfactant, hexadecyltrimethylammonium bromide (CTAB), aiming at the passivation of the hole traps at the cr-PVA/P3HT interface. The treatment with HCl leads to an excessive increase in the transistor leakage current and unstable electrical characteristics, despite implying an increase in the gate capacitance. The treatment with CTAB leads to transistors with ca. 50% higher specific capacitance and a tenfold increase in the charge carrier field-effect mobility, when compared to devices based on untreated cr-PVA.
ISSN:1463-9076
1463-9084
DOI:10.1039/c4cp02245a