Ternary organic solar cells (T‐OSCs) represent an efficient strategy for enhancing the performance of OSCs. Presently, the majority of high‐performance T‐OSCs incorporates well‐established Y‐acceptors or donor polymers as the third component. In this study, a novel class of conjugated small molecules has been introduced as the third component, demonstrating exceptional photovoltaic performance in T‐OSCs. This innovative molecule comprises ethylenedioxythiophene (EDOT) bridge and 3‐ethylrhodanine as the end group, with the EDOT unit facilitating the creation of multiple conformation locks. Consequently, the EDOT‐based molecule exhibits two‐dimensional charge transport, distinguishing it from the thiophene‐bridged small molecule, which displays fewer conformation locks and provides one‐dimensional charge transport. Furthermore, the robust electron‐donating nature of EDOT imparts the small molecule with cascade energy levels relative to the electron donor and acceptor. As a result, OSCs incorporating the EDOT‐based small molecule as the third component demonstrate enhanced mobilities, yielding a remarkable efficiency of 19.3%, surpassing the efficiency of 18.7% observed for OSCs incorporating thiophene‐based small molecule as the third component. The investigations in this study underscore the excellence of EDOT as a building block for constructing conjugated materials with multiple conformation locks and high charge carrier mobilities, thereby contributing to elevated photovoltaic performance in OSCs.

中文翻译：

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用于有机太阳能电池的具有多重构象锁的基于乙撑二氧噻吩的小分子供体，效率为 19.3%

三元有机太阳能电池（T-OSC）代表了提高 OSC 性能的有效策略。目前，大多数高性能 T-OSC 都采用成熟的 Y 受体或供体聚合物作为第三组分。在这项研究中，引入了一类新型共轭小分子作为第三种成分，在 T-OSC 中展示了卓越的光伏性能。这种创新分子包含亚乙基二氧噻吩 (EDOT) 桥和作为端基的 3-乙基绕丹宁，EDOT 单元有助于形成多重构象锁。因此，基于 EDOT 的分子表现出二维电荷传输，这与噻吩桥联小分子不同，后者表现出较少的构象锁并提供一维电荷传输。此外，EDOT 强大的供电子性质赋予小分子相对于电子供体和受体的级联能级。结果，掺入基于 EDOT 的小分子作为第三组分的 OSC 表现出增强的迁移率，产生了 19.3% 的显着效率，超过了掺入基于噻吩的小分子作为第三组分的 OSC 的 18.7% 的效率。本研究的研究强调了 EDOT 作为构建具有多重构象锁和高载流子迁移率的共轭材料的基础材料的卓越性，从而有助于提高 OSC 的光伏性能。