有机太阳能电池中自由载流子产生方式的研究，不仅有利于澄清其物理机理，而且也有利于提高器件的光电转化效率。迄今为止，研究人员普遍认为给体/受体界面激子拆分是产生自由载流子的唯一途径。然而在此界面，电荷转移态、激子、电子和空穴等多种形式共存,使得界面电子与激子有可能通过相互作用而直接将激子解离，形成一种新的产生自由载流子方式。本项目拟通过构建界面电子-激子相互作用体系来深入探究这一新的产生自由载流子的方式，以达到制备新型有机太阳能电池的目的。即首先采用瞬态光电压技术和有机磁效应技术确认界面电子-激子相互作用这一新的产生自由载流子的方式；然后，利用分子束外延技术制备出这一新型有机太阳能电池器件，以探索出影响这一新型有机太阳能电池光电转化效率的主要因素；最后，通过更换给体材料、调控有机膜生长时的衬底温度等方式优化这一新型有机太阳能电池，为其应用提供理论支撑。

The study for converting excitons to the free carriers in organic solar cells (OSCs) not only benefits to clarify its physical mechanism, but also good for improving the power conversion efficiency. Up to now, the researchers believe that the excitons disscociation at the donor/acceptor(D/A) interface is the only way to generate free carriers in OSCs. However, CT states, excitons and the free carriers coexist at the D/A interface and might interact with each other, inducing electron-exciton interaction. A new type of photocurrent generation through electron-exciton interaction directly, different from the traditional exciton dissociation method, may be realized in OSCs. This project intends to explore the new type through establishing the electron-exciton interaction system. That is, confirming the new type of free carrier's generation through transient photovoltage and magnetic field effect firstly. And then, the main factors of the new type will be discovered by fabracting the new type OSCs by molecular beam epitaxy. Finally, the optimization of the new type OSCs will be fabricated by changing donor materials or controlling the substrate tempertaure.