π-Extension improves the photovoltaic performance: a helical perylene diimide oligomer based three-dimensional non-fullerene acceptor

Abstract

A helical perylene diimide oligomer (PDI2) is gradually emerging as a promising building block for the construction of organic optoelectronic materials.

The Structural Origins of Intense Circular Dichroism in a Waggling Helicene Nanoribbon

“…The designs and syntheses of WH­[6]­[6] and WH­[6] evolved from those of previously reported PDI-based nanoribbons (Scheme ). In particular, the direct bromination of the double-[4]­helicene hPDI 2 gives 1 , which has enabled the preparation of several aryl frameworks . In this case, the Suzuki-Miyaura cross-coupling of two equivalents of 1 with the diborylated species 2 or 3 (see the Supporting Information for details concerning their preparation) yielded 4 or 5 , respectively.…”

Structural symmetry-breaking of a perylene diimide acceptor at the N-position for enhanced photovoltaic performance

“…1), have emerged as field-favorite building blocks in constructing nonfullerene acceptors (NFAs). 32–56 Besides the nonplanar molecular configurations, the molecular symmetry of the NFAs plays an indispensable role in the determination of photovoltaic performance. 57 Research on asymmetric NFAs has been relatively overlooked even though its development could be traced back to 2010.…”

The Synthesis of Asymmetric Perylene Diimide Acceptors and Their Optoelectronic Properties Studies

“…Alternatively, helical π‐extended PDI oligomers in which the PDI moieties were fused together by ethylene bridges were reported by Wang and Nuckolls groups independently [38–43] . Moreover, significant achievements have been done in building new NFAs using the helical PDI oligomers, especially the dimer (PDI2) as building blocks [44–64] …”