Gate-bias assisted charge injection in organic field-effect transistors

Gate-bias assisted charge injection in organic field-effect transistors

Brondijk, J.J.
Torricelli, F.
Smits, E.C.P.
Blom, P.W.M.
de Leeuw, D.M.

2012

The charge injection barriers in organic field-effect transistors (OFETs) seem to be far less critical as compared to organic light-emitting diodes (OLEDs). Counter intuitively, we show that the origin is image-force lowering of the barrier due to the gate bias at the source contact, although the corresponding gate field is perpendicular to the channel current. In coplanar OFETs, injection barriers up to 1 eV can be surmounted by increasing the gate bias, enabling extraction of bulk transport parameters in this regime. For staggered transistors, however, the injection is gate-assisted only until the gate bias is screened by the accumulation channel opposite to the source contact. The gate-assisted injection is supported by two-dimensional numerical charge transport simulations that reproduce the gate-bias dependence of the contact resistance and the typical S-shaped output curves as observed for OFETs with high injection barriers.

Mechatronics, Mechanics & Materials
HOL - Holst
TS - Technical Sciences
High Tech Systems & Materials
Electronics
Industrial Innovation
Organic electronics
Field-effect transistor
Charge transport
Charge injection
Numerical simulation
Barrier lowering

http://resolver.tudelft.nl/uuid:df2a61f7-6b45-4313-8db1-3a653c342ef8

476294

Elsevier, Amsterdam

1566-1199

Organic Electronics, 13, 1526-1531

article