TY - JOUR
T1 - Phenylalkylammonium passivation enables perovskite light emitting diodes with record high-radiance operational lifetime
T2 - the chain length matters
AU - Guo, Yuwei
AU - Apergi, Sofia
AU - Li, Nan
AU - Chen, Mengyu
AU - Yin, Chunyang
AU - Yuan, Zhongcheng
AU - Gao, Feng
AU - Xie, Fangyan
AU - Brocks, Geert
AU - Tao, Shuxia
AU - Zhao, Ni
N1 - Funding Information:
This work was supported by the General Research Fund (RGC Ref No. 14307819) and NSFC/RGC Joint Research Scheme (Ref No. N_CUHK449/19) from the Research Grants Council of Hong Kong. The work done in the Netherlands was supported by funding from NWO START-UP and Computational Sciences for Energy Research (CSER) tenure track program of Shell and NWO (Project No. 15CST04-2). We would like to thank Mr. Xingwei Zeng, Ms. Mengna Zhao, Ms. Yujing Wang, and Prof. Qian Miao for their helpful suggestions regarding material characterizations and Mr. Shirong Qiu for his help in time-resolved photoluminescence analysis.
Publisher Copyright:
© 2021, The Author(s).
PY - 2021/1/28
Y1 - 2021/1/28
N2 - Perovskite light emitting diodes suffer from poor operational stability, exhibiting a rapid decay of external quantum efficiency within minutes to hours after turn-on. To address this issue, we explore surface treatment of perovskite films with phenylalkylammonium iodide molecules of varying alkyl chain lengths. Combining experimental characterization and theoretical modelling, we show that these molecules stabilize the perovskite through suppression of iodide ion migration. The stabilization effect is enhanced with increasing chain length due to the stronger binding of the molecules with the perovskite surface, as well as the increased steric hindrance to reconfiguration for accommodating ion migration. The passivation also reduces the surface defects, resulting in a high radiance and delayed roll-off of external quantum efficiency. Using the optimized passivation molecule, phenylpropylammonium iodide, we achieve devices with an efficiency of 17.5%, a radiance of 1282.8 W sr−1 m−2 and a record T50 half-lifetime of 130 h under 100 mA cm−2.
AB - Perovskite light emitting diodes suffer from poor operational stability, exhibiting a rapid decay of external quantum efficiency within minutes to hours after turn-on. To address this issue, we explore surface treatment of perovskite films with phenylalkylammonium iodide molecules of varying alkyl chain lengths. Combining experimental characterization and theoretical modelling, we show that these molecules stabilize the perovskite through suppression of iodide ion migration. The stabilization effect is enhanced with increasing chain length due to the stronger binding of the molecules with the perovskite surface, as well as the increased steric hindrance to reconfiguration for accommodating ion migration. The passivation also reduces the surface defects, resulting in a high radiance and delayed roll-off of external quantum efficiency. Using the optimized passivation molecule, phenylpropylammonium iodide, we achieve devices with an efficiency of 17.5%, a radiance of 1282.8 W sr−1 m−2 and a record T50 half-lifetime of 130 h under 100 mA cm−2.
UR - http://www.scopus.com/inward/record.url?scp=85099939331&partnerID=8YFLogxK
U2 - 10.1038/s41467-021-20970-6
DO - 10.1038/s41467-021-20970-6
M3 - Article
C2 - 33510190
AN - SCOPUS:85099939331
SN - 2041-1723
VL - 12
JO - Nature communications
JF - Nature communications
IS - 1
M1 - 644
ER -