Organic photovoltaics are a promising alternative to silicon-based solar cells with benefits of low-cost production and large scalability. However, its performance is restricted by a non-equilibrium phase-separated morphology. Additive compositions of block copolymer P3HT-b-PFTBT are most likely to mix up and form donor and acceptor morphologies. The parallel bulk-heterojunction model was proposed to show the characteristic photovoltaic parameters and the effect of the parallel cascading heterojunction formation made up of isolated PCBM acceptor domains. We demonstrate block copolymer-based stretchable solar cells on plastic foil substrates, with good power conversion efficiency. To compare the efficiency and stretchability, organic photovoltaic devices were constructed using P3HT/PC₆₁BM, PTB7/PC₇₁BM and P3HT/P3HT-b-PFTBT/PCBM active layer combinations. We find that through rational design of the component ratio, the block-copolymer-based solar cell can withstand tensile strain up to 37%.

有机光伏技术是硅基太阳能电池的有前途的替代品，具有低成本生产和大可扩展性的优点。但是，其性能受到非平衡相分离形态的限制。嵌段共聚物P3HT-b-PFTBT的添加剂组合物最有可能混合并形成供体和受体形态。提出了并联的本体-异质结模型，以显示特征性的光伏参数以及由孤立的PCBM受体域组成的并联级联异质结形成的影响。我们在塑料箔基板上演示了基于嵌段共聚物的可拉伸太阳能电池，具有良好的功率转换效率。为了比较效率和可拉伸性，使用P3HT / PC ₆₁ BM，PTB7 / PC构造了有机光伏器件₇₁ BM和P3HT / P3HT-b-PFTBT / PCBM有源层组合。我们发现，通过合理设计组分比率，嵌段共聚物基太阳能电池可以承受高达37％的拉伸应变。