Article Dans Une Revue ACS Energy Letters Année : 2024

Molecular Cross-Linking Enhances Stability of Non-Fullerene Acceptor Organic Photovoltaics

Sang T. Pham
  • Fonction : Auteur
Seunggu Lee
  • Fonction : Auteur

Résumé

Understanding efficiency–durability relationships and related mitigation strategies is an important step toward the commercialization of organic photovoltaics (OPVs). Here, we report that a photoactivated 6-bridged azide cross-linker (6Bx) improves the morphological stability by suppressing the thermally activated diffusion of (Y6) acceptor molecules in PM6:Y6 bulk-heterojunction (BHJ)-based OPVs. Cross-linked PM6:Y6 (0.05 wt % 6Bx) BHJ OPVs retain 93.4% of the initial power conversion efficiency upon thermal aging at 85 °C for 1680 h (T80 = 3290 h). Molecular origins of enhanced thermal stability are corroborated by optical spectroscopy, surface imaging, 2D solid-state nuclear magnetic resonance (ssNMR), Raman spectroscopy, scanning electron diffraction (SED) measurements, and analysis of the BHJ thin films. The facile single-step cross-linking strategy in conjugation with advanced characterization methods presented in the study paves the way toward developing durable OPVs based on non-fullerene acceptors (NFAs).
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Dates et versions

hal-04909354 , version 1 (23-01-2025)

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Citer

Sangcheol Yoon, Braulio Reyes-Suárez, Sang T. Pham, Herve Vezin, Yeny Tobon, et al.. Molecular Cross-Linking Enhances Stability of Non-Fullerene Acceptor Organic Photovoltaics. ACS Energy Letters, 2024, ACS Energy Letters, 10 (1), pp.541-551. ⟨10.1021/acsenergylett.4c02897⟩. ⟨hal-04909354⟩
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