TY - JOUR
T1 - Poly(2-alkyl-2-oxazoline) electrode interlayers for improved n-type organic field effect transistor performance
AU - Nam, Sungho
AU - de la Rosa, Victor R.
AU - Cho, Yuljae
AU - Hamilton, Rick
AU - Cha, SeungNam
AU - Hoogenboom, Richard
AU - Bradley, Donal
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: D.D.C.B. thanks the University of Oxford for startup funds including a research fellowship for S.N.
PY - 2019/10/1
Y1 - 2019/10/1
N2 - Thin film interlayer materials inserted at the metal/semiconductor interface provide an effective means to improve charge injection and reduce the threshold voltage for organic field-effect transistors. Here, we report the use of poly(2-alkyl-2-oxazoline) interlayers for gold electrodes within n-type poly[[N,N′-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5′-(2,2′-bithiophene)] field-effect transistors. We specifically show that the use of poly(2-ethyl-2-oxazoline) yields a reduction in the work function from 5.07 to 4.73 eV (ΔE = 0.34 eV), an increase in the electron mobility from 0.04 to 0.15 cm2/V s (3.75 times), and a reduction in the threshold voltage from 27.5 to 16.5 V (ΔV = 11 V) relative to bare gold. The alkyl side chain of the poly(2-alkyl-2-oxazoline) has a significant influence on the film microstructure and, as a consequence, also device performance.
AB - Thin film interlayer materials inserted at the metal/semiconductor interface provide an effective means to improve charge injection and reduce the threshold voltage for organic field-effect transistors. Here, we report the use of poly(2-alkyl-2-oxazoline) interlayers for gold electrodes within n-type poly[[N,N′-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5′-(2,2′-bithiophene)] field-effect transistors. We specifically show that the use of poly(2-ethyl-2-oxazoline) yields a reduction in the work function from 5.07 to 4.73 eV (ΔE = 0.34 eV), an increase in the electron mobility from 0.04 to 0.15 cm2/V s (3.75 times), and a reduction in the threshold voltage from 27.5 to 16.5 V (ΔV = 11 V) relative to bare gold. The alkyl side chain of the poly(2-alkyl-2-oxazoline) has a significant influence on the film microstructure and, as a consequence, also device performance.
UR - http://hdl.handle.net/10754/656834
UR - http://aip.scitation.org/doi/10.1063/1.5118337
UR - http://www.scopus.com/inward/record.url?scp=85073188282&partnerID=8YFLogxK
U2 - 10.1063/1.5118337
DO - 10.1063/1.5118337
M3 - Article
SN - 0003-6951
VL - 115
SP - 143302
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 14
ER -