In a BHJ solar cell, a photoelectric conversion layer contains a condensed carbocyclic ring polymer (photoelectric conversion material). The condensed carbocyclic ring polymer is obtained by polymerizing monomers represented by the following general formulae (1) and (2) to prepare a polyphenylene and then reacting the polyphenylene. R1 to R6 in the general formula (1) independently represent a hydrogen atom or a solubilizing group, and the monomer represented by the general formula (1) exhibits a higher solubility in an organic solvent with the solubilizing group than without the solubilizing group. Ar in the general formula (2) represents an unsubstituted or substituted aromatic group, and R7 and R8 in the general formula (2) independently represent a hydrogen atom, an unsubstituted or substituted aromatic group, a methyl group, or a silyl group.
在BHJ太阳能电池中,光电转换层包含一种含有紧凑的碳环聚合物(光电转换材料)的光电转换层。该紧凑的碳环聚合物是通过聚合以下通式(1)和(2)所代表的单体制备聚
苯乙烯,然后反应聚
苯乙烯得到的。通式(1)中的R1至R6独立地表示氢原子或溶解基团,通式(1)所代表的单体在具有溶解基团的有机溶剂中比没有溶解基团的有机溶剂具有更高的溶解度。通式(2)中的Ar表示未取代或取代芳香族基团,通式(2)中的R7和R8独立地表示氢原子、未取代或取代芳香族基团、甲基或
硅基团。