Recombination of Injected Charge Carriers in Bulk Heterojunction Solar Cells
G. Juska, K. Arlauskas,, G. Sliauzys, M. Scharber, A Pivrikas and R. Osterbacka
In bulk regioregular poly(3-hexylthiophene) / 1-(3-methoxycarbonyl) propyl-1phenyl-[6,6]-methanofullerene heterojunction using dark and photo double injection current transients the temperature and electric field dependences of bimolecular recombination coefficient (B) and ambipolar mobility (ma) were investigated. It was obtained that both the B and the activation energy of B are significantly lower than these of, typical for low mobility materials, Langevin recombination.