有机太阳能电池(OSCs)因其轻质、低成本、柔性和溶液加工等优势,在便携电源、柔性穿戴设备和建筑一体化光伏等领域展现出广阔的应用前景。近年来,随着非富勒烯受体材料的创新和器件工程的进步,单结OSCs的光电转换效率已突破20%。然而,活性层的形貌对光电转换过程有着重要影响,如何获得理想的多尺度形貌是提升器件性能的关键。
在众多形貌优化策略中,挥发性固体添加剂因其在热退火后无残留、重复性好和器件稳定性高的特点,展现出巨大的应用潜力。然而,关于这类添加剂的电子结构特性及其与活性层相互作用机制的研究仍较为有限。


Figure 1. a) Chemical structures of PM6 and L8-BO. b) Calculated ESP distribution and chemical structures of DBB and DFBB additives. UV-vis absorption spectra of c) PM6 and d) L8-BO treated with different additives. e) Non-covalent interactions by RDG analysis between L8-BO and additives. f-j) 2D GIWAXS patterns of L8-BO with different additives. i) CCL of L8-BO films treated with different additives.

Figure 2. a) J-V curves. b) PCE histograms. c) EQE spectra. d) JSC-Plight and e) VOC-Plight characteristics and f) Jph-Veff curves. g) TPC curves. h) TPV curves. i) Charge mobilities.

Figure 3. In-situ UV-vis absorption spectra of a) w/o, b) DBB and c) DFBB. Time evolution of acceptor and donor peak positions in PM6:L8-BO d) w/o, e) DBB and f) DFBB. g) Crystallization time of donor and acceptor with different additives. h) Working mechanism of DFBB additive during the film formation.

Figure 4. a-c) component ratios with the film thickness variation. 2D GIWAXS patterns of PM6:L8-BO-based blend film d) w/o, e) with DBB, and f) with DFBB. g)1D line-cuts for PM6:L8-BO-based blend films. h) CCL histograms of 2D GIWAXS data of blend films treated with different additives. i) RSoXS profiles.

Figure 5. J-V characteristic curves of a) PM6:Y6-based, b) PM6:BTP-eC9-based and c) D18:L8-BO-based devices after different treatments. d-f) Corresponding EQE spectra.
原文链接:
https://onlinelibrary.wiley.com/doi/10.1002/ange.202500085
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