NOVELTY - A heteroacene based oligothiophene-derived compound, is new.    USE - The heteroacene based oligothiophene-derived compound is useful in manufacturing a photovoltaic solid state device, where the device is selected from a solar cell, a heterojunction, an optoelectronic device and a light emitting device (claimed).    ADVANTAGE - The heteroacene based oligothiophene-derived compound provides a hole transporting and light absorbing material for solid state photovoltaic devices, in particular solid state solar cells, and for thin-film photovoltaic devices and organic-inorganic perovskite films or layer photovoltaic devices. It can also be used to provide an efficient solar cell, which can be rapidly prepared in an efficient way, using readily available or low cost materials such as conductive material, using a short manufacturing procedure based on industrially known manufacturing steps, keeping the material costs and the material impact on the environment very low.    DETAILED DESCRIPTION - A heteroacene based oligothiophene-derived compound of Formula (I), is new.    E1, E2, E3, E4 and E5=O, S, Se, CR2, SiR2 or NR, ;    R=1-20C alkyl, 2-20C alkenyl, 2-20C alkynyl, 4-20C aryl, 2-20C acetyl and 1-20C fluoroalkyl group, where the alkyl, alkenyl, alkynyl, acetyl and fluoroalkyl, if they comprise 3 or more carbons may be linear, branched or cyclic and where aryl group may be substituted;    R1 and R2=H, 1-20C alkyl, 1-20C alkoxy, 2-20C alkenyl, 4-20C aryl or 1-20C fluoroalkyl group, where the alkyl, alkenyl, alkynyl, alkoxy, and fluoroalkyl, if they comprise 3 or more carbons may be linear, branched or cyclic;    Ar1 and Ar2=identical or different moieties selected from heteroaromatic ring system having one or more aromatic rings comprising 5-40 ring atoms and one or more heteroatoms independently selected from N, S, Se, SiR2, O or NR, where the aromatic ring may further be substituted by one or more moieties independently selected from H, keto (=O) group, fluoro group, 1-20C alkyl, 1-20C alkoxy, 2-20C alkenyl and 2-20C alkynyl group; and    Z=a moiety identically or differently selected from 2-20C alkenyl, 2-20C alkynyl, 2-20C cyanoalkenyl, 2-20C dicyanoalkenyl, 2-20C cyanoalkenyl carboxylic ester derivative, 2-20C alkenyl dicarboxylic ester derivative or 4-20C heteroaryl, 4-20C alkenylheteroaryl, where one or more heteroatoms are independently selected from O, S or NR, where the alkenyl, cyanoalkenyl, dicyanoalkenyl, cyanoalkenyl carboxylic ester derivative, alkenyl dicarboxylic ester derivative, heteroaryl and alkenyl heteroaryl may be further substituted by one or more moieties independently selected from H, 4-20C aryl, 1-20C alkyl, 1-20C alkoxy group, keto (=O) group, cyano group, 2-20C dicyanoalkenyl, 2-20C cyanoalkenyl, carboxylic ester derivative group or dicarboxylic ester derivative group.    An INDEPENDENT CLAIM is included for a photovoltaic solid state device which comprising the heteroacene based oligothiophene-derived compound.