The back cover image shows the new donor–acceptor–acceptor (D–A–A)-type molecular donors combined with C70 that yield an efficient vacuum-processed organic solar cell. Wong and his co-workers show that the physical properties of the new D–A–A molecules with benzochalcogenodiazole as the central A unit can be subtly manipulated by tuning the chalcogens (O, S, Se). A clear structure–property–performance relationship has been successfully established, indicating that the donor molecule with a S-based electron-accepting core shows superior power conversion efficiency compared to those of O- and Se-embedded counterparts. The evident bimolecular recombination is responsible for the inferior performance of the benzoxadiazole-embedded donor. More details can be found in the Full Paper by Ting et al. on page 457 ff.