Naphthalene diimide (NDI) has been known as a key molecular architecture for organic dyes. Photo-absorption capability of its derivatives are, however, limited, and it has been difficult to create new NDI-based materials that can absorb wide range of the solar spectrum from the visible to near-infrared light. By elaborating new heterocycle-fused NDI derivatives, we have developed a series of materials that show variety of photo-absorption properties and found that one of such new organic dye molecules can be useful as an active material for organic solar cells, that can convert wide-range of light from the ultraviolet to near-infrared. The resulting organic solar cells showed higher power-conversion efficiency than 9% as well as excellent stability.
Bis(naphthothiophene diimide)indacenodithiophenes as Acceptors for Organic Photovoltaics.
J. Hamonnet, M. Nakano, K. Nakano, H. Sugino, K. Takimiya, K. Tajima, Chem. Mater. 2017, 29, 9618–9622.