gt n u2014 and any combination thereof in yet another embodiment of the disclosed photovoltaic layer at least one of the bridging groups b is selected from the list comprising p phenylcne ph p oligomer where p is 1 2 3 4 or 5 2 7 oligofluorene fl s oligomer where s is 1 2 3 or 4 and alkylen groups u2014 ch 2 j u2014 where j is 1 2 3 or 4 in still another embodiment of the disclosed photovoltaic layer the modifying groups x 1 and x 2 are selected from the list comprising h cl br f oh no 2 no and nh 2 in one embodiment of the disclosed photovoltaic layer at least one of the polycyclic cores co 1 and cor 2 comprises hetero atoms selected from the list comprising nitrogen oxygen sulfur and any combination thereof in still another embodiment of the disclosed photovoltaic layer the polycyclic core cor 2 is selected from the list comprising structures from 1 to 5 shown in 1 table 1 in one embodiment of the disclosed photovoltaic layer the polycyclic core cor 1 is selected from the list comprising structures from 6 to 20 shown in table 2 in another embodiment of the disclosed photovoltaic layer the polycyclic core cor 1 possesses a symmetry of the.