Abstract
The poly(3,4-ethylene-dioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) is widely utilized as hole-transporting layers (HTLs) in perovskite light-emitting diodes (PeLEDs). However, the acidic and hygroscopic nature of PEDOT:PSS restricts its practical applications. Herein, we replace PEDOT:PSS with MoO3 as HTLs to achieve high-performance PeLEDs. The MoO3 HTLs were fabricated from the solution of phosphomolybdic acid in acetonitrile by solution-processing spin-coating technology. Smooth and uniform MoO3 HTLs could be obtained by carefully adjusting solution concentration and O2 plasma treatment time. Then, the MoO3 based device achieves a maximum external quantum efficiency of 3.8%, identical to the PEDOT:PSS based device. Moreover, the PeLEDs with MoO3 as the HTLs render better shelf stability than the PEDOT:PSS counterpart. We believe the solution-processed MoO3 films can provide a better alternative for the HTLs in PeLEDs by virtue of their simple and ecofriendly preparations.
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