Enantiopure versus Racemic Naphthalimide End‐Capped Helicenic Non‐fullerene Electron Acceptors: Impact on Organic Photovoltaics Performance

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Abstract
Impact of the enantiopurity on organic photovoltaics (OPV) performance was investigated through the synthesis of racemic and enantiomerically pure naphthalimide end‐capped helicenes and their application as non‐fullerene molecular electron acceptors in OPV devices. A very strong increase of the device performance was observed by simply switching from the racemic to the enantiopure forms of these π‐helical non‐fullerene acceptors with power conversion efficiencies jumping from 0.4 to about 2.0 % in air‐processed poly(3‐hexylthiophene)‐based devices, thus highlighting the key role of enantiopurity in the photovoltaic properties.

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