Organic transistor

An organic transistor comprising:

• a source electrode;
• a drain electrode;
• a gate electrode;
• an organic semiconductor layer comprising one or more layers;
• and
• an insulating layer between the gate electrode and the organic semiconductor layer,
• wherein the one or more layers of the organic semiconductor layer comprise a compound of Formula 1:
• wherein:
• Ra and Rb are the same as or different from each other, and are each independently a group which serves as an electron acceptor;
• Y1 to Y5 are the same as or different from each other, and are each independently CRR′, NR, O, SiRR′, PR, S, GeRR′, Se, or Te;
• Y6 and Y7 are different from each other, and are each independently a direct bond, CRR′, NR, O, SiRR′, PR, S, GeRR′, Se, or Te;
• a is 0 or 1;
• when a is 0, Y6 is a direct bond, and Y7 is CRR′, NR, O, SiRR′, PR, S, GeRR′, Se, or Te;
• when a is 1, Y7 is a direct bond, and Y6 is CRR′, NR, O, SiRR′, PR, S, GeRR′, Se, or Te;
• n and m are each an integer from 0 to 5;
• when n and m are each 2 or more, the structures in the parenthesis are the same as or different from each other;
• and
• R1, R2, R11 to R14, R, and R′ are the same as or different from each other, and are each independently hydrogen, deuterium, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group.