Correlation of hole mobility, exciton diffusion length, and solar cell characteristics in phthalocyanine/fullerene organic solar cells

摘要

The authors investigated heterojunction organic solar cells composed of different metal phthalocyanines (MPcs, M = Fe, Co, Ni, Cu, and H_2)/fullerene (C_(60)) and compared the solar cell characteristics with the field-effect hole mobilities (μ_h) and exciton diffusion length (L_(ex)) of the different MPcs. They observed that the short circuit current (J_(SC)) is linearly dependent on the μ_h of the MPcs, except for ZnPc. They also estimated the L_(ex) of the MPcs by creating a line of best fit using the action spectra of the external quantum efficiency in the solar cells and found that J_(SC) is closely correlated with the L_(ex) of the MPcs.