For the retrieval of best polymers for effective organic solar cells as testing parameter we have used the coefficient of bimolecular recombination (B). The B measurement demonstrated that in pure MEH-PPV layers its value is close to the value of Langevin recombination coefficient (B_L), while in case of perylene/MEH-PPV junction layers the ratio B/B_L≅0.013, and in blends of MEH-PPV with PCBM B/B_L<:0.01.
We demonstrate new advantages of the space-charge-limited photocurrent technique for the investigations of charge carrier recombination. Bimolecular recombination coefficient in a-Si:H estimated according to suggested method for both electrons and holes is presented.
In the multilayers of hydrogenated nanocrystalline and amorphous silicon bimolecular recombination coefficient can be reduced in half, while in low-temperature hydrogenated nanocrystalline silicon samples it can be reduced by one order of magnitude. The similarity of the activation energies of both the bimolecular recombination (B) and the Langevin-type recombination (B_L) coefficients point to decisive role of tunneling in processes of meeting of electrons and holes, although the ratio B/B_L<0.01.
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.