英国剑桥大学Bronstein, Hugo报道了模型异质结界面合成揭示分子构型依赖的光诱导电荷转移。相关研究成果于2024年8月20日发表在国际顶尖学术期刊《自然—化学》。

控制有机异质结界面处的分子构型是开发高效光电器件的关键。由于难以表征这些埋藏和（可能）无序的异质界面，大多数系统中的界面结构仍然是一个谜。

该文中，研究人员展示了一种设计和控制模型接口的综合策略，使其能够与散装材料隔离开来进行详细研究。这是通过合成一种聚合物来实现的，其中非富勒烯受体部分使用双烷基链共价键合到供体聚合物框架上，将受体和供体单元限制在贯穿空间的共面排列中。可以调整受体相对于聚合物骨架中富电子和贫电子部分的约束几何形状，以控制电荷分离的动力学和由此产生的电荷转移态的能量，从而深入了解控制有机异质结电荷产生的因素。

附：英文原文

Title: Synthesis of model heterojunction interfaces reveals molecular-configuration-dependent photoinduced charge transfer

Author: Royakkers, Jeroen, Yang, Hanbo, Gillett, Alexander J., Eisner, Flurin, Ghosh, Pratyush, Congrave, Daniel G., Azzouzi, Mohammed, Andaji-Garmaroudi, Zahra, Leventis, Anastasia, Rao, Akshay, Frost, Jarvist Moore, Nelson, Jenny, Bronstein, Hugo

Issue&Volume: 2024-08-20

Abstract: Control of the molecular configuration at the interface of an organic heterojunction is key to the development of efficient optoelectronic devices. Due to the difficulty in characterizing these buried and (probably) disordered heterointerfaces, the interfacial structure in most systems remains a mystery. Here we demonstrate a synthetic strategy to design and control model interfaces, enabling their detailed study in isolation from the bulk material. This is achieved by the synthesis of a polymer in which a non-fullerene acceptor moiety is covalently bonded to a donor polymer backbone using dual alkyl chain links, constraining the acceptor and donor units in a through space co-facial arrangement. The constrained geometry of the acceptor relative to the electron-rich and -poor moieties in the polymer backbone can be tuned to control the kinetics of charge separation and the energy of the resultant charge-transfer state giving insight into factors that govern charge generation at organic heterojunctions.

DOI: 10.1038/s41557-024-01578-x

Source: https://www.nature.com/articles/s41557-024-01578-x