Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session X20: Hybrid Perovskites -- Low Dimensions
8:00 AM–10:48 AM,
Friday, March 8, 2019
BCEC
Room: 157A
Sponsoring
Unit:
DMP
Chair: Xiaoyang Zhu, Columbia University
Abstract: X20.00010 : Revealing nanocrystal growth within CsPbI2xBr3-x perovskite thin films
10:12 AM–10:24 AM
Presenter:
Lindsey Gray
(Wake Forest University)
Authors:
Lindsey Gray
(Wake Forest University)
Junwei Xu
(Wake Forest University)
Xiaoheng Sean Yan
(Wake Forest University)
David Carroll
(Wake Forest University)
Wayni Nie
(Los Alamos National Laboratory)
Inorganic lead halide perovskites have greatly impacted the optoelectronics field due to their band-tunability and solution-processability in high performance light emitting diodes (LEDs). However, the bulk material is unstable under room temperature which tends to phase segregate under ambient or device operational conditions. Recent breakthrough has successfully demonstrated a stabilized CsPbX3 phase at room temperature by fabricating into nanostructured crystals (NC). Further, photo-physical property enhancement is attributed to the nano-scale structure control which are thus the most promising candidate for the lighting applications. It is therefore critical to systematically understand the structure of the CsPbX3 NC synthesized via controlled approach and connect that with device operation efficiency and stability. In this study, we systematically investigated the synthetic approach to obtain room temperature stabilized mixed halide nanocrystals, focusing on the effect of the molar ratio between Cs source and Pb source on the optical performance in the mixed CsPbI2Br perovskite thin films. The findings revealed the nanocrystal growth mechanism of the in situ processed perovskite layer which enabled us to fabricate bright and efficient red perovskite LEDs.
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