2024
DOI: 10.1002/adma.202400578
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Endothermic Charge Separation Occurs Spontaneously in Non‐Fullerene Acceptor/Polymer Bulk Heterojunction

Kushal Rijal,
Neno Fuller,
Fatimah Rudayni
et al.

Abstract: Organic photovoltaics (OPVs) based on non‐fullerene acceptors (NFAs) have achieved a power conversion efficiency close to 20%. These NFA OPVs can generate free carriers efficiently despite a very small energy level offset at the donor/acceptor (D/A) interface. Why these NFAs can enable efficient charge separation (CS) with low energy losses remains an open question. Here, the CS process in the PM6:Y6 bulk heterojunction (BHJ) is probed by time‐resolved two‐photon photoemission (TR‐TPPE) spectroscopy. We found … Show more

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