Conjugated Polyelectrolytes as Efficient Hole Transport Layers in Perovskite Light-Emitting Diodes.
Lee, Bo Ram
Yu, Jae Choul
Park, Jong Hyun
Wong, Matthew S
Jung, Eui Dae
Nam, Yun Seok
Park, Song Yi
Kim, Jin Young
Bazan, Guillermo C
Song, Myoung Hoon
American Chemical Society
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Lee, B. R., Yu, J. C., Park, J. H., Lee, S., Mai, C., Zhao, B., Wong, M. S., et al. (2018). Conjugated Polyelectrolytes as Efficient Hole Transport Layers in Perovskite Light-Emitting Diodes.. ACS Nano https://doi.org/10.1021/acsnano.8b01715
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.
LEDs, PEDOT:PSS, conjugated polyelectrolytes (CPEs), electroluminescence, hole transport layer (HTL), lead halide perovskites, perovskite light-emitting diodes (PeLEDs)
B.R.L., D.D.N., and R.H.F. acknowledge financial support from the Engineering and Physical Sciences Research Council of the UK (EPSRC). B.R.L. was supported by the National Research Foundation of Korea (NRF-2018R1C1B6005778) and the Pukyong National University Research Fund (CD20171504). M.H.S. was supported by the Mid-Career Researcher Program (2018R1A2B2006198), a brand project (1.180061.01) of the Ulsan National Institute of Science and Technology (UNIST), and the KIST-UNIST partnership program (1.150091.01/ 2.150464.01). H.C. was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20173010013200). S.D.S. acknowledges funding from the People Programme (Marie Curie Actions) of the European Union’s Seventh Framework Programme (FP7/2007-2013) under REA grant agreement number PIOF-GA-2013-622630.
European Commission (622630)
External DOI: https://doi.org/10.1021/acsnano.8b01715
This record's URL: https://www.repository.cam.ac.uk/handle/1810/283630