In organic solar cells, the charge-transfer (CT) electronic states that form at the interface between the electron-donor (D) and electron-acceptor (A) materials have a crucial role in exciton-dissociation, charge-separation and charge-recombination processes. Since the introduction of active layers consisting of D–A bulk heterojunctions, CT states have been the focus of extensive experimental and theoretical studies. In this Review, we assess the current understanding of CT states and describe how factors such as the geometry of the D–A interface, electronic polarization and the extent of electron delocalization affect their nature and influence the radiative and non-radiative decay processes. We focus on the description and application of fundamental concepts, which provides the framework to discuss the path to organic solar cells with efficiencies comparable to those in inorganic photovoltaic technologies.

在有机太阳能电池中，在电子供体（D）和电子受体（A）材料之间形成的电荷转移（CT）电子态在激子离解，电荷分离和电荷转移中起着至关重要的作用。重组过程。自从引入由D–A体异质结组成的有源层以来，CT状态一直是广泛的实验和理论研究的重点。在这篇评论中，我们评估了对CT状态的当前理解，并描述了诸如D–A界面的几何形状，电子极化和电子离域化程度等因素如何影响其性质并影响辐射和非辐射衰变过程。我们专注于基本概念的描述和应用，