Abstract
We systematically explored the effect of the electrical property of a homogenously deposited donor layer (HDonor) on the efficiency of planar-mixed heterojunction organic solar cells. The equivalent circuit model analysis and the dark current characteristics indicate that an increased energy barrier for the electron between the mixed layer and the HDonor (ΔELUMO) decreases the leakage path, thereby resulting in an improved fill factor of the cell. Moreover, the incorporation of HDonor with high hole mobility (μh) to device leads to enhanced charge collecting efficiency and decreased recombination losses. As a result, the device containing HDonor with high μh and ΔELUMO showed 28% improvement in power conversion efficiency (5.54%) compared to that of a device with the conventional structure. We believe that this strategy will be a guideline to unlock the full potential of materials in organic solar cells.
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