The invention relates to an organic photodetector (OPD) comprising a photoactive layer that contains an electron acceptor and an electron donor, the acceptor being an n-type semiconductor which is a small molecule that does not contain a fullerene moiety, and the electron donor being a p-type semiconductor which is a conjugated copolymer comprising donor and acceptor units.

A novel AB-type copolymer for use in organic photovoltaics. The AB-type copolymer comprises

a unit A, where the unit A is

##STR00001##

where R.sub.1 is a carbon chain from about 1 to about 30 units and where Y is selected from CN, F and Cl. The B unit of the AB-type copolymer is selected from is selected from:

##STR00002##

wherein
X.sub.1, X.sub.2, X.sub.3, and X.sub.4 are independently selected from the group consisting of: H, Cl, F, CN, alkyl, alkylthiol, alkoxy, ester, ketone, amide and aryl groups.

A novel AB-type copolymer for use in organic photovoltaics. The AB-type copolymer comprises

a unit A, where the unit A is

##STR00001##

where R.sub.1 is a carbon chain from about 1 to about 30 units and where Y is selected from CN, F and Cl. The B unit of the AB-type copolymer is selected from is selected from:

##STR00002## ##STR00003##

wherein
X.sub.1, X.sub.2, X.sub.3, and X.sub.4 are independently selected from the group consisting of: H, Cl, F, CN, alkyl, alkylthiol, alkoxy, ester, ketone, amide and aryl groups.

Disclosed are conjugated polymers based on terthiophene. Such polymers exhibit good solubility and great solution processibility, and that enable highly efficient OPVs.

The present invention relates to polymers comprising a repeating unit of the formula I, or III and their use as organic semiconductor in organic devices, especially an organic field effect transistor (OFET), or a device containing a diode and/or an organic field effect transistor. The polymers according to the invention have excellent solubility in organic solvents and excellent film-forming properties. In addition, high efficiency of energy conversion, excellent field-effect mobility, good on/off current ratios and/or excellent stability can be observed, when the polymers according to the invention are used in organic field effect transistors.

The present invention relates to polymers comprising a repeating unit of the formula I, or III and their use as organic semiconductor in organic devices, especially an organic field effect transistor (OFET), or a device containing a diode and/or an organic field effect transistor. The polymers according to the invention have excellent solubility in organic solvents and excellent film-forming properties. In addition, high efficiency of energy conversion, excellent field-effect mobility, good on/off current ratios and/or excellent stability can be observed, when the polymers according to the invention are used in organic field effect transistors.

Provided are: an organic thin film transistor element including an organic semiconductor layer that includes an organic semiconductor compound, in which a content of one kind or two or more kinds of atoms selected from the group consisting of Li, Na, P, K, Fe, Pd, Sn, B, Cl, Br, and I in the organic semiconductor layer is 300 to 700 ppm; an organic semiconductor film-forming composition used for forming the organic semiconductor layer of the element; a method of forming an organic semiconductor film using the composition; and an organic semiconductor film formed of the composition.

Provided are an organic semiconductor element including an organic semiconductor film that includes a polymer having a repeating unit represented by the following Formula (1), the polymer, and an organic semiconductor composition and an organic semiconductor film including the polymer.

##STR00001##

In the formula, Z represent a 5-membered aromatic heterocycle. R.sup.C1 and R.sup.C2 each independently represent a halogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aromatic hydrocarbon group, or an aromatic heterocyclic group. n.sup.1 and n.sup.2 each independently represent 0 or 1. R.sup.C3 to R.sup.C10 each independently represent a hydrogen atom, a halogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aromatic hydrocarbon group, or an aromatic heterocyclic group.

The present invention relates to polymers comprising a repeating unit of the formula I, or III and their use as organic semiconductor in organic devices, especially an organic field effect transistor (OFET), or a device containing a diode and/or an organic field effect transistor. The polymers according to the invention have excellent solubility in organic solvents and excellent film-forming properties. In addition, high efficiency of energy conversion, excellent field-effect mobility, good on/off current ratios and/or excellent stability can be observed, when the polymers according to the invention are used in organic field effect transistors.

A compound having the following formula: ##STR00001##
which can also be embedded into a conjugated oligomeric of polymeric backbone, is proposed for optical and electro optical applications.