Acceptor–acceptor-type conjugated polymer semiconductors

The rapid development of electronic devices such as organic field-effect transistors (OFETs) and solar cells makes the research and development of electronic transport materials imminent. The acceptor–acceptor-type (A−A-type) conjugated n-type polymer semiconductors have caught much attention due to the outstanding advantages on excellent electron-accepting capabilities, the precise adjustment of energy levels and the mass production at low fabrication cost. This article systematically reviews the polymerization methods of A−A-type polymers and the recent advancements applied in OFETs and polymer solar cells (PSCs). The analyses of the synthesis and the relationship between device performances and polymer molecular structures may provide a constructive guidance for the further development of high-performance n-type polymer materials.