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Impact of Oxygen Vacancy on Energy-Level Alignment at MoOx/Organic Interfaces

Oxygen vacancies in MoOx play an essential role in interface energetics for charge injection and transport in organic devices. The influence of oxygen vacancy on energy-level alignment at the interface between MoOx and organic hole-transport layers is studied via photoemission spectroscopy. The degree of oxygen vacancies in MoOx is controlled by thermal annealing, which results in the partial reduction of Mo cations and a decrease in their work function. The hole-injection barrier at MoOx/organic interfaces increases as a consequence of the increase in oxygen deficiency.