Open-shell Donors and Closed-shell Acceptors in Organic Solar Cells

24 May 2021, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


The active materials of organic solar cells are widely recognized to show closed-shell singlet ground state and their electron spin resonance signals are attributed to the defects and impurities. Herein, we disclose the inherent open-shell singlet ground state of donors and the closed-shell structure of acceptors via the combination of variable temperature NMR, electron spin resonance, superconducting quantum interference device and theoretical calculation, providing a new perspective to understand the intrinsic molecular structure in organic solar cells.


Organic solar cell
Non-fullerene acceptor


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