Organic semiconductors

A solution for forming a thin film transistor, the solution comprising a solute comprising an organic semiconducting compound wherein the semiconducting compound has the structure:

• where X1 and X2 may be the same or different and are selected from the group consisting of (i) optionally substituted straight, branched or cyclic alkyl chains with 1 to 20 carbon atoms, alkoxy amino, amido, and alkenyl, or (ii) a polymerizable or reactive group selected from the group consisting of halogens, boronic acids, diboronic acids and esters of boronic acids and diboronic acids, alkylene groups and stannyl groups;
• and wherein Z1 and Z2 are independently S, O, Se or NR1, and where W1 and W2 are independently S, O, Se, NR1 or —CR1═CR1—, where R1 is H or a substituent group.

A semiconductive compound comprising a structure selected from the group consisting of:

• where X1, X2, X4, X5, X8 and X9 may be the same or different and are selected from the group consisting of (i) optionally substituted straight, branched or cyclic alkyl chains with 1 to 20 carbon atoms, alkoxy amino, amido, and alkenyl, or (ii) a polymerizable or reactive group selected from the group consisting of halogens, boronic acids, diboronic acids and esters of boronic acids and diboronic acids, alkylene groups and stannyl groups;
• and wherein Z1 and Z2 are independently S, O, Se or NR1, and where W1 and W2 are independently S, O, Se, NR1 or —CR1═CR1—, where R1 is H or a substituent group.