Conjugated block polymers have attracted considerable interest in the past few decades,primarily owing to their potentials for applications in optoelectronics.1 Among π-conjugated polymers,poly(3-hexylthiophene) (P3HT) has been widely investigated due to its excellent electronic properties and synthetic accessibility.2 The polymer has also been incorporated into different types of block copolymers to control the patterning and/or to optimize the optoelectronic properties.