基于噻吩-苯非对称单元的DPP类聚合物给体材料的合成及光伏性能

为了优化聚合物太阳能电池的光伏性能,设计合成了一种基于噻吩-苯非对称单元的二酮吡咯并[3,4-c]吡咯(DPP)类聚合物给体材料(PDPP-PT).非对称结构的设计使得该聚合物具有较好的分子堆积,有利于器件的制备.该聚合物具有范围在300~900 nm的宽吸收光谱、1.5 eV的窄光学带隙.在器件性能方面,活性层厚度达260 nm时,测得开路电压(Voc)为0.68 V,光电转换效率(PCE)为1.51%.因此,PDPP-PT给体材料在制备厚活性层太阳能电池时具有一定的优势并为聚合物给体材料的分子设计提供了一种新的思路.

Synthesis and Photovoltaic Performance of the Asymmetric Polymer of a Thiophene-Benzene Unit-contained Diketopyrrolopyrrole (DPP) Derivative Used for Donor Material of Organic Solar Cells

A novel donor material for organic solar cells — the polymer of a diketopyrrolo[3,4-c]pyrrole (DPP)derivative that contains thiophene-benzene asymmetric unit (namely PDPP-PT)was designed and synthesized with the aim of optimizing the photovoltaic performance of polymer solar cells.The introduction of the asymmetric structure endows the polymer with better mole-cular packing,which is beneficial to device fabrication.This novel polymer has a wide absorption window ranging from 300 nm to 900 nm and a narrow optical band gap of 1.5 eV.The corresponding solar cells featured an open-circuit voltage of 0.68 V and a power con-version efficiency (PCE)of 1.51% with 260 nm thick active layer.Hence,the PDPP-PT exhibits advantages in the fabrication of thick-active-layer solar cells,and can provide a new idea for molecular design of polymer donor materials.