The George and Josephine Butler Polymer Research Laboratory, Department of Chemistry, Center for Macromolecular Science and Engineering, University of Florida, Box 117200, Gainesville, Florida 32611, USA.
J Am Chem Soc. 2011 Jul 6;133(26):10062-5. doi: 10.1021/ja204056m. Epub 2011 Jun 15.
We report the synthesis and bulk heterojunction photovoltaic performance of the first dithienogermole (DTG)-containing conjugated polymer. Stille polycondensation of a distannyl-DTG derivative with 1,3-dibromo-N-octyl-thienopyrrolodione (TPD) results in an alternating copolymer which displays light absorption extending to 735 nm, and a higher HOMO level than the analogous copolymer containing the commonly utilized dithienosilole (DTS) heterocycle. When polyDTG-TPD:PC(70)BM blends are utilized in inverted bulk heterojunction solar cells, the cells display average power conversion efficiencies of 7.3%, compared to 6.6% for the DTS-containing cells prepared in parallel under identical conditions. The performance enhancement is a result of a higher short-circuit current and fill factor in the DTG-containing cells, which comes at the cost of a slightly lower open circuit voltage than for the DTS-based cells.
我们报告了首例含二噻吩并锗（DTG）的共轭聚合物的合成及本体异质结光伏性能。通过二锡基-DTG 衍生物与 1,3-二溴-N-辛基噻吩并吡咯二酮（TPD）的 Stille 缩聚反应，得到了一种光吸收可延伸至 735nm 的交替共聚物，其 HOMO 能级高于具有常用二噻吩并硅（DTS）杂环的类似共聚物。当聚 DTG-TPD：PC(70)BM 共混物用于倒置本体异质结太阳能电池时，与在相同条件下平行制备的含 DTS 的电池相比，这些电池的平均功率转换效率为 7.3%。性能的提高是由于含 DTG 的电池的短路电流和填充因子更高，但其开路电压略低于基于 DTS 的电池。
