Overcoming the Interfacial Photocatalytic Degradation of Non-fullerene Acceptor-Based Organic Photovoltaics by Introducing a Titanium Suboxide Layer
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Although recent remarkable advancements in power conversion efficiencies (PCEs) have achieved over 19%, poor photostability has been a serious bottleneck to commercializing organic photovoltaics (OPVs). Especially, the photocatalytic effect that occurs in the most widely employed electron transport layer (ETL), zinc oxide (ZnOX), has been regarded as the main degradation factor for the photostability of OPVs. Herein, we introduce titanium suboxide (TiOX) ETL for OPVs to enhance photostability by developing a new and facile method. Through the investigation of mass information at the interface between ETL and the photoactive layer by using orbitrap/time-of-flight secondary-ion mass-spectrometry (OrbiSIMS), we confirm that the TiOX suppresses the photocatalytic effect. The resulting TiOX-OPV shows excellent photostability, obtaining 80% of the initial PCE for up to 200 h under continuous illumination, which is 10 times longer than that of the conventional ZnOX system (19 h).