Photovoltaic Performance Improvement of D–A Copolymers Containing Bithiazole Acceptor Unit by Using Bithiophene Bridges
作者:Maojie Zhang、Xia Guo、Yongfang Li
DOI:10.1021/ma201976t
日期:2011.11.22
solar cell (PSC) based on PDTSBTBTz: PC70BM (1:1, w/w) was 3.82% with Jsc = 8.68 mA/cm2, Voc = 0.72 V, and FF = 0.611, under the illumination of AM1.5, 100 mW/cm2. In contrast, the PCE of the PSC based on PBDTBTBTz:PC70BM (1:1, w/w) reached 4.46% with Jsc = 9.01 mA/cm2, Voc = 0.82 V, and FF = 0.603. These results indicate that bithiophene-bridged D–A copolymers are promising photovoltaic donor materials
通过Pd催化的Stille偶联反应合成了两种基于噻吩受体单元和二噻吩并噻吩(DTS)或苯并二噻吩(BDT)供体单元的双噻吩桥连的D-A共聚物PDTSBTBTz和PBDTBTBTz。两种共聚物表现出良好的热稳定性,在可见光区域的强吸收性以及在约200℃下相对较低的HOMO能级。−5.10 eV。通过SCLC方法测得的PDTSBTBTz和PBDTBTBTz的空穴迁移率分别为1.85×10 –3和1.77×10 –3 cm 2 /(V s)。基于PDTSBTBTz:PC 70 BM(1:1,w / w)的聚合物太阳能电池(PSC)的功率转换效率(PCE)为3.82%,J sc = 8.68 mA / cm 2,V oc在AM1.5、100 mW / cm 2的光照下= 0.72 V,且FF = 0.611 。相反,基于PBDTBTBTz:PC 70 BM(1:1,w / w)的PSC的PCE达到4