基于多环大π共轭聚合物的设计、合成与光伏性能研究

聚合物太阳能电池由于具有价廉、质轻、可丝网印刷制备大面积柔性器件等优点，近年来受到科学界的极大重视。本项目拟设计合成新型多环大π结构的D-A型共轭聚合物、含Ullazine大π共轭聚合物和含D-A1-D-A2结构三元共轭聚合物，并对共轭聚合物中电子给体和受体基元进行化学结构修饰；通过优化共轭聚合物的分子结构，拓宽吸收光谱范围，调节前线分子轨道能级，改善电荷传输性能和相分离形态，从而提高共轭聚合物的光伏性能。通过研究多环大π共轭聚合物的结构与其光物理性质、电化学性质及光伏性能的关系，期望能够为获得高能量转换效率的聚合物太阳能电池提供理论和实验依据。

Polymer solar cells (PSCs) have attracted considerable attention in recent years due to their potential for low cost, lightweight, and the roll-to-roll process for making flexible large area devices. In this project, we design and synthesize the series of D-A (donor-acceptor) conjugated polymers based on the multiring and large π conjugated polymers, big ring conjugated polymers with Ullazine unit, and terpolymers with D-A1-D-A2 structure, respectively. Meanwhile, the chemical structures of the electron donor and acceptor units which are used to build these D-A conjugated polymers will be also modified. The broad absorption spectrum, narrow band gap, high charge mobility, optimal microphase separation state and good photovoltaic performances could be achieved by adjusting finely the chemical structures of the conjugated polymers. The relationship between the chemical structures of D-A copolymres containing the multiring and big π systems and their photophysical, electrochemical and photovoltaic properties will be investigated in detail. It is expected that our results can provid the theoretic and experimental guidelines for high-performance polymer solar cells.