The invention relates to asymmetrical linear organic oligomers represented by the following formula (I), X--R.sup.1Ar.sub.nR.sup.2 (I) in which n is from 4 to 10, Ar is for example an optionally substituted 2,5-thienylene group, R.sup.1 is for example a C.sub.10 C.sub.20 alkylene group, R.sup.2 is for example a C.sub.1 C.sub.12 alkyl group, and X is for example a vinyl group or an alkoxysilyl group. Also described is a process for the production of such organic oligomers, and semiconductors in electronic modules that include such organic oligomers.