尽管有机太阳能电池（OSCs）在性能上取得了显著进展，但活性层材料的本征稳定性和形貌稳定性仍然限制其商业化。
近日，江西师范大学陈义旺教授和廖勋凡教授等人在Science China Materials发表研究论文，提出在准平面异质结OSCs的聚合物给体中添加受阻型酚类抗氧化剂AO1010，以提升光氧化稳定性和形貌稳定性。
本文要点
1) AO1010通过多个羟基结合位点与超氧自由基反应，淬灭自由基并终止链式降解反应，从而提高材料的本征稳定性。此外，AO1010优良的热稳定性和空间位阻效应抑制了活性层中给体和受体材料的过度聚集，改善了形貌稳定性。2) AO1010中的羟基还与明星给体PM6中的氟原子形成氢键，增强了分子间的相互作用，提升了PM6的结晶度和分子堆积有序性，有利于电荷分离和传输。3) 添加AO1010的PM6/L8-BO体系器件效率提高至19.03%，稳定性也显著改善。本文将收录于“2025 Emerging Investigator Issue”。Figure 1. (a) Molecular structures and (b) ESP patterns of PM6, BTP-eC9 and AO1010; RDG scatter plots of (c) PM6 and (d) PM6+AO1010; normalized absorption spectra of (e) PM6 and PM6+AO1010 (5 wt%) films.Figure 2. (a) J-V curves of PM6/BTP-eC9 and (b) PM6/L8-BO-based OSCs processed with or without AO1010 and (c) EQE spectra of the corresponding optimal devices; (d) incident-light-intensity-dependent JSC and (e) VOC characteristics, (f) Jph-Veff curves, (g) hole and electron mobilities, (h) TPC decay curves and (i) TPV decay curves of PM6/BTP-eC9 and PM6+AO1010/BTP-eC9-based optimal devices.Figure 3. The TA profiles and spectra probed of (a, c) PM6/BTP-eC9 and (b, d) PM6+AO1010/BTP-eC9 (at 0.15, 1, 10, 100 ps time delay), respectively; (e) the rising kinetics of PM6 GSB in blend films showing the hole transfer process; (f) the decay kinetics of BTP-eC9 GSB in blend films showing the recombination process; the photoluminescence imaging results of (g) PM6, (h) PM6+AO1010, (i) PM6/BTP-eC9 and (j) PM6+AO1010/BTP-eC9 films under 542 nm excitation; the lifetime imaging results of (k) PM6/BTP-eC9 and (l) PM6+AO1010/BTP-eC9 films under 542 nm excitation.![]()
Figure 4. Photo-oxidation and stabilization of donor polymers. (a) Autoxidation cycle of polymers and points of attack of stabilizing additives (RH: pristine polymer; R·: carbon centered radical formed by H-abstraction); (b) schematic diagram of the photo-oxidative aging process of the polymer in the active layer in the presence of free radicals; UV-vis aging spectra of (c) PM6/BTP-C9 and (d) PM6+AO1010/BTP-C9 under 365 nm UV light in air; EPR spectra of (e) PM6 and PM6+AO1010, as well as (f) PM6/BTP-eC9 and PM6+AO1010/BTP-eC9, aged or unaged at 365 nm UV light in air for 20 h; the storage stability of the (g) PM6/BTP-eC9 and (h) PM6/L8-BO based OSCs devices with and without AO1010.Qian Wang, Shuo Zhao, Haojia Ding, Peipei Zhu, Yuang Fu, Yujie Lv, Xinhui Lu, Haiming Zhu, Xunfan Liao, Yiwang Chen. Enhancing stability and performance of pseudo-planar heterojunction organic solar cells using a hindered phenolic antioxidant with over 19% efficiency. Sci. China Mater. (2024).https://doi.org/10.1007/s40843-024-3146-4
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