A Heteronuclear W/Cu/S Clusters‐Based Donor–Acceptor Polymer for Perovskite Solar Cells

Abstract

Donor–acceptor polymers containing the repeating moiety of electron‐rich unit (donor) and electron‐deficient group (acceptor), impair their highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) considerably localized on the donors and acceptors, respectively. Their band gaps can be well‐tuned by the electron‐donating ability of donors and the electron‐withdrawing ability of acceptors. The efficient splitting of photo‐generated excitons by electronic pull–push effect between donor and acceptor could promote the effective charge transport within polymer. Therefore, donor–acceptor polymers have the merits of versatile molecule structure, accessible functionalization, and adjustable electronic structure, becoming one of the most promising organic optoelectronic materials. For instance, by adjusting the alternating array of donor and acceptor moieties, a series of donor–acceptor polymers with lower band gaps and good light‐harvesting ability are prepared and used as potential photoelectronic materials.