Abstract
Large displacement current and then apparent external quantum efficiency are observed for ‘dead’ (no photocurrent under steady-state illumination) organic solar cells under chopped light illumination. This displacement current is generated from charge trapping and detrapping under non-steady-state illumination, reflecting a large number of trap states in the devices. The photocurrent degradation of organic solar cells is suggested to be caused by these traps. Thus a physical degradation process of organic solar cells is proposed: the filled traps would hinder the transport of free carriers from the donor–acceptor interface to the electrodes on the one hand and quench the excitons generated in the active layer on the other hand.
Published Version
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