Abstract
We present a numerical study of the effects of the energy barrier between the lowest unoccupied molecular orbital of the acceptor layer and the cathode, the thicknesses of the donor layer and acceptor layer on the distributions of carrier density, the electric fields and the electric potentials of organic planar heterojunction solar cells. We obtained the quantitative dependencies of the distribution of carrier density, electric fields and the electric potentials on these quantities. The results provide a theoretical foundation for the experimental study of open-circuit organic planar heterojunction solar cells.
Highlights
Theoretical modelWhen the planar heterojunction organic solar cell is illuminated, a large number of excitons (the bound electron-hole pairs) are created in the organic layer of the solar cell
We present a numerical study of the effects of the energy barrier between the lowest unoccupied molecular orbital of the acceptor layer and the cathode, the thicknesses of the donor layer and acceptor layer on the distributions of carrier density, the electric fields and the electric potentials of organic planar heterojunction solar cells
The results provide a theoretical foundation for the experimental study of open-circuit organic planar heterojunction solar cells
Summary
When the planar heterojunction organic solar cell is illuminated, a large number of excitons (the bound electron-hole pairs) are created in the organic layer of the solar cell. These excitons dissociate into free electrons and holes after they diffuse across the interface between the donor and acceptor materials. To study the interplay among the distributions, fields and parameters, we present a numerical approach to solving eqs. (1)–(9)
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