Modulation of charge migration and ink flow dynamics exceeding 19% efficiency for blade-coating pseudo-planar heterojunction organic solar cells,Energy & Environmental Science

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Modulation of charge migration and ink flow dynamics exceeding 19% efficiency for blade-coating pseudo-planar heterojunction organic solar cells
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2024-08-10 , DOI: 10.1039/d4ee01522c
Houdong Mao ₁ , Jiahua Zhang ₁ , Xin Cen ₁ , Jiayou Zhang ₂ , Lin Wen ₁ , Jingwei Xue ₃ , Dou Luo ₄ , Lifu Zhang ₂ , Zhao Qin ₁ , Wei Ma ₃ , Licheng Tan ₁ , Yiwang Chen _{1,

2,

5}

Affiliation

Constructing efficient and regular charge transport channels is essential to achieve high power conversion efficiency (PCE) in pseudo-planar heterojunction (PPHJ) organic solar cells (OSCs). Nanoimprint lithography (NIL) has been proven to be an effective strategy in promoting exciton dissociation and charge transport for PPHJ devices fabricated by a sequential spin-coating deposition method. However, the precise regulation of active layer ink inter-permeation during sequential blade-coating (SBC) and an augmented exciton dissociation interface to increase carrier separation/transport efficiency remains challenging. Here, we have for the first time applied an NIL-assisted SBC technique to fabricate high-performance PPHJ OSCs. A blade-coated donor with subsequent NIL treatment can induce ordered molecular stacking and increase crystallinity to inhibit donor film erosion from the acceptor solution. Besides, the micropattern will affect acceptor ink flow during blade-coating, which can precisely control donor/acceptor inter-penetration to enlarge the exciton dissociation interface and form regular charge migration channels. Consequently, the champion PPHJ device via an NIL-assisted SBC technique with a suitable micropattern exhibits the highest PCE of 19.14% for a PM6/BO-4Cl:L8-BO system. Furthermore, the 1.00 cm² ternary device exhibits a competitive PCE of 17.98%. This charge migration strategy provides a path for constructing desirable active layer morphology with ideal vertical gradient distribution and regular charge transport pathways to achieve large-area high-performance PPHJ OSCs.

中文翻译：

刀片涂层伪平面异质结有机太阳能电池的电荷迁移和墨水流动动力学调节效率超过 19%

构建高效且规则的电荷传输通道对于在赝平面异质结（PPHJ）有机太阳能电池（OSC）中实现高功率转换效率（PCE）至关重要。纳米压印光刻 (NIL) 已被证明是促进通过顺序旋涂沉积方法制造的 PPHJ 器件的激子解离和电荷传输的有效策略。然而，在顺序刮刀涂布 (SBC) 过程中精确调节活性层墨水相互渗透以及增强激子解离界面以提高载流子分离/传输效率仍然具有挑战性。在这里，我们首次应用 NIL 辅助 SBC 技术来制造高性能 PPHJ OSC。随后进行 NIL 处理的刀片涂层供体可以诱导有序分子堆积并增加结晶度，从而抑制受体溶液对供体膜的侵蚀。此外，微图案会影响刮刀涂布过程中受体墨水的流动，从而可以精确控制供体/受体的相互渗透，扩大激子解离界面并形成规则的电荷迁移通道。因此，冠军 PPHJ 器件通过NIL 辅助 SBC 技术和合适的微图案，在 PM6/BO-4Cl:L8-BO 系统中表现出最高的 19.14% 的 PCE。此外，1.00 cm ²三元器件表现出17.98%的有竞争力的PCE。这种电荷迁移策略提供了构建具有理想垂直梯度分布和规则电荷传输路径的理想活性层形态的途径，以实现大面积高性能PPHJ OSC。

更新日期：2024-08-10

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