Degradation and recovery of the external quantum efficiency of organic photovoltaic structure

Resumo

The photosensitivity of a mixed composition of donor CuPc and acceptor C₆₀, its degradation in time (for 16 months), and partial recovery (issues that were out of consideration previously) have been investigated. The sample is a simple nanostructure without encapsulation (quartz–SnO₂–CuPc:C₆₀–Al), the degradation of which is easier to analyze. It is shown that the process under study involves two mechanisms: slow (because of the decrease in the carrier lifetime) and relatively fast (because of the decrease in the internal field) degradations of the sample photosensitivity.