Department of Materials Science and Engineering, the Argonne-Northwestern Solar Energy Research Center, Northwestern University, Evanston, Illinois 60208, USA.
Adv Mater. 2012 May 2;24(17):2242-8. doi: 10.1002/adma.201103948. Epub 2012 Mar 26.
Bithiophene imide (BTI) and benzodithiophene (BDT) copolymers are synthesized for application in organic photovoltaic (OPV) cells. The electron deficiency of the BTI units leads to polymers with a low-lying HOMOs (∼-5.6 eV). Inverted solar cells are fabricated to investigate the OPV performance of the BTI-based polymers and achieve power conversion efficiencies up to 5.5%, with substantial V(oc)s above 0.9 V which are among the highest V(oc)s reported to date for polymer/PCBM solar cells. The results indicate that the BTI is a promising building block for constructing polymer donors for OPV applications.
双噻吩并[3,2-b:2',3'-d]噻吩酰亚胺（BTI）和苯并二噻吩（BDT）共聚物被合成用于有机光伏（OPV）电池。BTI 单元的电子缺乏导致聚合物具有低 HOMO（约-5.6 eV）。制备了倒置太阳能电池以研究基于 BTI 的聚合物的 OPV 性能，并实现了高达 5.5%的功率转换效率，开路电压（Voc）超过 0.9 V，这是迄今为止报道的聚合物/PCBM 太阳能电池中最高的 Voc 之一。结果表明，BTI 是构建用于 OPV 应用的聚合物给体的有前途的构建块。
