The research field of conducting polymers has been developed since 1970 s

and attracted considerable attention due to their promising applications in organic electronics.However

most of the polymer optoelectronic devices are fabricated based on the films of conjugated polymers

which are inferior for us to investigate the intrinsic charge transport properties of conjugated polymers and the fabrication of high performance devices because of the large amount of defects and disordered molecules.Organic crystals are the best candidates for solving the above mentioned problems due to their long-range molecular order

low defects and no grain boundaries.However

it has been a big challenge for the production of high quality conjugated polymer micro/nano crystals

In this paper

we summarize the progress of preparation

characterization and field-effect transistor application of conjugated polymer micro/nano crystals

and finally we also give a concise discussion for the development prospect and existing problems of conjugated polymer micro/nano crystals and devices.