1 research outputs found
Overcoming the Interfacial Photocatalytic Degradation of Nonfullerene Acceptor-Based Organic Photovoltaics by Introducing a UV-A-Insensitive Titanium Suboxide Layer
Although recent dramatic advances in power conversion
efficiencies
(PCEs) have resulted in values over 19%, the poor photostability of
organic photovoltaics (OPVs) has been a serious bottleneck to their
commercialization. The photocatalytic effect, which is caused by incident
ultraviolet-A (UV-A, 320–400 nm) light in the most commonly
used zinc oxide (ZnOX) electron transport
layer (ETL), significantly deteriorates the photostability of OPVs.
In this work, we develop a new and facile method to enhance the photostability
of nonfullerene acceptor-based OPVs by introducing UV-A-insensitive
titanium suboxide (TiOX) ETL. Through
an in-depth analysis of mass information at the interface between
the ETL and photoactive layer, we confirm that the UV-A-insensitive
TiOX suppresses the photocatalytic effect.
The resulting device employing the TiOX ETL shows excellent photostability, obtaining 80% of the initial
PCE for up to 200 h under 1 sun illumination, which is 10 times longer
than that of the conventional ZnOX system
(19 h)