Abstract
We examined the influence of atmospheric gases on the photoelectric properties of titanyl phthalocyanine (TiOPc) thin films, using in situ photocurrent measurements under high vacuum without/with exposure to air. Prior to air exposure, the photocurrent of amorphous and Phase II thin films of TiOPc with thicknesses of 24 nm exhibited low external quantum efficiencies (EQE) of 0.05% and 0.52%, respectively, in the Q-band regions, and these values were enhanced to 0.21% and 12.0%, respectively, by air exposure. In contrast, this treatment resulted in a decrease in the photosensitivity, defined as the photo-to-dark current ratio, by 1 or 2 orders of magnitude. Once these thin films experienced air exposure, their photoelectric properties did not recover to the original ones even after restoration to high vacuum.
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