立体阻碍诱导的低激子结合能可实现低驱动力有机太阳能电池

IF 13.9 Q1 CHEMISTRY, MULTIDISCIPLINARY
Tianyu Hu, Xufan Zheng, Ting Wang, Aziz Saparbaev, Bowen Gao, Jingnan Wu, Jingyi Xiong, Ming Wan, Tingting Cong, Yuda Li, Ergang Wang, Xunchang Wang, Renqiang Yang
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引用次数: 0

摘要

激子结合能(Eb)一直被视为光电转换过程中电荷分离的关键参数。将光伏材料的 Eb 降到最低可以促进低驱动力有机太阳能电池(OSC)中激子的解离,从而提高功率转换效率(PCE);然而,通过深思熟虑的设计原则降低 Eb 仍然是一项重大挑战。在此,我们在 Y 系列受体中加入了作为立体阻碍结构的笨重侧链,通过调节分子内和分子间的相互作用将 Eb 降到最低。理论和实验结果表明,立体阻碍引起的最佳分子内和分子间相互作用可提高分子极化性,促进分子间电子轨道重叠,并促进电荷转移的非局域化途径,从而实现低 Eb。通过精确的立体阻碍调制,Y-ChC5 中的 Eb 明显降低,从而最大限度地减少了对低驱动力 OSC 中激子解离的不利影响,实现了 19.1% 的出色 PCE 和超过 95% 的内部量子效率。我们的研究为降低 Eb 提供了新的分子设计原理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Steric hindrance induced low exciton binding energy enables low-driving-force organic solar cells

Steric hindrance induced low exciton binding energy enables low-driving-force organic solar cells

Steric hindrance induced low exciton binding energy enables low-driving-force organic solar cells

Exciton binding energy (Eb) has been regarded as a critical parameter in charge separation during photovoltaic conversion. Minimizing the Eb of the photovoltaic materials can facilitate the exciton dissociation in low-driving force organic solar cells (OSCs) and thus improve the power conversion efficiency (PCE); nevertheless, diminishing the Eb with deliberate design principles remains a significant challenge. Herein, bulky side chain as steric hindrance structure was inserted into Y-series acceptors to minimize the Eb by modulating the intra- and intermolecular interaction. Theoretical and experimental results indicate that steric hindrance-induced optimal intra- and intermolecular interaction can enhance molecular polarizability, promote electronic orbital overlap between molecules, and facilitate delocalized charge transfer pathways, thereby resulting in a low Eb. The conspicuously reduced Eb obtained in Y-ChC5 with pinpoint steric hindrance modulation can minimize the detrimental effects on exciton dissociation in low-driving-force OSCs, achieving a remarkable PCE of 19.1% with over 95% internal quantum efficiency. Our study provides a new molecular design rationale to reduce the Eb.

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CiteScore
17.40
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