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Conjugated Polyelectrolytes as Efficient Hole Transport Layers in Perovskite Light-Emitting Diodes
Lee, Bo Ram,Yu, Jae Choul,Park, Jong Hyun,Lee, Seungjin,Mai, Cheng-Kang,Zhao, Baodan,Wong, Matthew S.,Jung, Eui Dae,Nam, Yun Seok,Park, Song Yi,Di Nuzzo, Daniele,Kim, Jin Young,Stranks, Samuel D.,Baza American Chemical Society 2018 ACS NANO Vol.12 No.6
<P>Perovskite-based optoelectronic devices have been rapidly developing in the past 5 years. Since the first report, the external quantum efficiency (EQE) of perovskite light-emitting diodes (PeLEDs) has increased rapidly through the control of morphology and structure from 0.1% to more than 11%. Here, we report the use of various conjugated polyelectrolytes (CPEs) as the hole injection layer in PeLEDs. In particular, we find that poly[2,6-(4,4-bis-potassium butanylsulfonate)-4<I>H</I>-cyclopenta-[2,1-<I>b</I>;3,4-<I>b</I>′]-dithiophene)] (PCPDT-K) transfers holes effectively, blocks electron transport from the perovskite to the underlying ITO layer, and reduces luminescence quenching at the perovskite/PCPDT-K interface. Our optimized PeLEDs with PCPDT-K show enhanced EQE by a factor of approximately 4 compared to control PeLEDs with PEDOT:PSS, reaching EQE values of 5.66%, and exhibit improved device stability.</P> [FIG OMISSION]</BR>