Crosslinkable polymeric materials for dielectric layers in electronic devices

A composition for providing a dielectric layer in an electronic device, the composition comprising:

• a polymer containing one or more units, wherein at least 50 mol% of the total number of units in the polymer are the following units (A) with crosslinkable side groups,
• in which
• X independently at each occurrence is a methylene group or oxygen,
• R independently at each occurrence is a methyl group or hydrogen,
• L1 is a divalent group which connects the polymer chain to the side group, and
• L2 is a divalent group which connects the polymer chain to the side group;
• and
• independently of the unit (A) the polymer comprises at least one second unit selected from
• and mixtures thereof, where
• L in each case is ethyloxy, isopropyloxy or ethylamidoxy or not present.

An electronic device comprising:

• at least one dielectric layer;
• and
• an organic semiconductor layer which is in contact with the at least one dielectric layer, wherein the at least one dielectric layer comprises:
• a) a crosslinked polymer containing one or more units, wherein at least 25 mol% of the total number of units in the polymer are derived from the following units (A) with crosslinkable side groups,
• in which
• X independently at each occurrence is a methylene group or oxygen,
• R independently at each occurrence is a methyl group or hydrogen,
• L1 is a divalent group which connects the polymer chain to the side group, and
• L2 is a divalent group which connects the polymer chain to the side group.

An electronic device comprising an organic field-effect transistor in top gate configuration or in bottom gate configuration and at least one dielectric layer, the at least one dielectric layer comprising:

• a) a crosslinked polymer containing one or more units, wherein at least 25 mol% of the total number of units in the polymer are derived from the following units (A) with crosslinkable side groups,
• in which
• X independently at each occurrence is a methylene group or oxygen,
• R independently at each occurrence is a methyl group or hydrogen,
• L1 is a divalent group which connects the polymer chain to the side group, and
• L2 is a divalent group which connects the polymer chain to the side group.

Method for preparing an electronic device which has at least one dielectric layer, the preparation of the dielectric layer comprising:

• a) deposition of a formulation on a substrate, the formulation comprising:
• i) at least one polymer containing one or more units, wherein at least 5 mol% of the total number of units in the at least one polymer are the following units (A) with crosslinkable side groups,
• in which
• X independently at each occurrence is a methylene group or oxygen,
• R independently at each occurrence is a methyl group or hydrogen,
• L1 is a divalent group which connects the polymer chain to the side group, and
• L2 is a divalent group which connects the polymer chain to the side group, and the at least one polymer further contains one or more of the following units:
• where L is ethyloxy, isopropyloxy or ethylamidoxy or not present,
• ii) at least one photoinitiator, and
• iii) at least one organic solvent,
• removing the solvent, and
• photocrosslinking of the resulting layer by actinic radiation.

Composition for providing a dielectric layer in an electronic device which composition comprises a polymer containing one or more units, wherein at least 25 mol% of the total number of units in the polymer are the following units (A) with crosslinkable side groups,

• in which
• X independently at each occurrence is a methylene group or oxygen,
• R is H,
• L1 is a benzyl unit which connects the polymer chain to the side group,
• L2 is a divalent group which connects the polymer chain to the side group, and
• n 0.

Composition for providing a dielectric layer in an electronic device, the composition comprising:

• a polymer containing one or more units, wherein at least 25 mol% of the total number of units in the polymer are the following units (A) with crosslinkable side groups,
• in which
• X independently at each occurrence is a methylene group or oxygen,
• R independently at each occurrence is a methyl group or hydrogen,
• L1 is a divalent group which connects the polymer chain to the side group, and
• L2 is a divalent group which connects the polymer chain to the side group;
• and
• the polymer further containing at least one second unit selected from
• and mixtures thereof, where
• L in each case is ethyloxy, isopropyloxy or ethylamidoxy or not present.

An electronic device comprising at least one dielectric layer and an organic semiconductor layer which is in contact with the dielectric layer, wherein the dielectric layer comprises:

• a) a crosslinked polymer containing one or more units, wherein at least 25 mol% of the total number of units in the polymer are derived from the following units (A) with crosslinkable side groups,
• in which
• X independently at each occurrence is a methylene group or oxygen,
• R independently at each occurrence is a methyl group or hydrogen,
• L1 is a divalent group which connects the polymer chain to the side group, and
• L2 is a divalent group which connects the polymer chain to the side group.