Open AccessConjugated Polyelectrolytes as Efficient Hole Transport Layers in Perovskite Light-Emitting Diodes
Author(s) -
Bo Ram Lee,
Jae Choul Yu,
Jong Hyun Park,
Seungjin Lee,
ChengKang Mai,
Baodan Zhao,
Matthew S. Wong,
Eui Dae Jung,
Yun Seok Nam,
Song Yi Park,
Daniele Di Nuzzo,
Jin Young Kim,
Samuel D. Stranks,
Guillermo C. Bazan,
Hyosung Choi,
Myoung Hoon Song,
Richard H. Friend
Publication year - 2018
Publication title -
acs nano
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.554
H-Index - 382
eISSN - 1936-086X
pISSN - 1936-0851
DOI - 10.1021/acsnano.8b01715
Subject(s) - perovskite (structure) , materials science , quantum efficiency , light emitting diode , pedot:pss , optoelectronics , diode , quenching (fluorescence) , luminescence , layer (electronics) , nanotechnology , chemical engineering , fluorescence , optics , physics , engineering
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 H-cyclopenta-[2,1- b;3,4- b']-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.
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