Jan Joseph, José Augusto Berrocal, Nicolás M. Casellas, Dirk M. Guldi, Tomás Torres, Miguel García-Iglesias
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引用次数: 0
摘要
一种新设计的 C3 对称圆盘形发色团 BTT(NDI)3,具有与电子供体 BTT 核心相连的电子受体萘二亚胺。BTT(NDI)3 在无极性溶剂中通过 π-π 和 3 倍氢键相互作用自组装成高度有序的手性超分子纤维。这导致 BTT 平面到平面堆叠和外层 NDI 的 J- 聚集的协同形成。这种结构确保了高电荷迁移率。只有光激发 BTT(NDI)3 聚合物中的 BTT 才会引发从 BTT 到 NDI 的单向电子转移,从而导致 (BTT-+-NDI--) 寿命比 NDI 光激发时形成的 (NDI-+-NDI--) 寿命长达 3 个数量级。多相衰变意味着电荷载流子的两极通路,即电子和空穴沿着各自的 BTT 和 NDI 叠层脱ocal。我们的超分子方法为开发具有电子和空穴连续通路的功能性超分子聚合物提供了潜力,进而可将有机光伏设备中的电荷重组损耗降至最低。
Long-Lived Charge Carrier Photogeneration in a Cooperative Supramolecular Double-Cable Polymer
A newly designed C3-symmetric disc-shaped chromophore, BTT(NDI)3, features electron accepting naphthalene diimides linked to an electron donor BTT core. BTT(NDI)3 self-assembles in apolar solvents into highly ordered, chiral supramolecular fibers through π–π and 3-fold hydrogen-bonding interactions. This leads to a cooperative formation of plane-to-plane stacking of BTTs and J-aggregation of the outer NDIs. Such a structure ensures high charge mobility. Only photoexcitation of BTT in the BTT(NDI)3 polymers triggers a unidirectional electron transfer from BTT to NDI and results in (BTT•+-NDI•–) lifetimes that are by up to 3 orders of magnitude longer compared to (NDI•+-NDI•–) that is formed upon NDI photoexcitation. A multiphasic decay implies ambipolar pathways for charge carriers, that is, electron and hole delocalization along the respective BTT and NDI stacks. Our supramolecular approach offers potential for developing functional supramolecular polymers with continuous pathways for electrons and holes and, in turn, minimizing charge recombination losses in organic photovoltaic devices.
期刊介绍:
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