TY - JOUR
T1 - One-Step Vapor-Phase Synthesis and Quantum-Confined Exciton in Single-Crystal Platelets of Hybrid Halide Perovskites
AU - Liu, Zhixiong
AU - Li, Yunhai
AU - Guan, Xinwei
AU - Mi, Yang
AU - Al-Hussain, Abdulrahman
AU - Ha, Son Tung
AU - Chiu, Ming-Hui
AU - Ma, Chun
AU - Amer, Moh R
AU - Li, Lain-Jong
AU - Liu, Jie
AU - Xiong, Qihua
AU - Wang, Jinlan
AU - Liu, Xinfeng
AU - Wu, Tao
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was supported by the King Abdullah University of Science and Technology (KAUST), the Ministry of Science and Technology (2016YFA0200700, 2017YFA0205004, and 2017YFA0204800), and the National Natural Science Foundation of China (21673054 and 21525311). Q.X. acknowledges support from and the Singapore Ministry of Education via an AcRF Tier 2 grant (MOE2015-T2-1-047) and Tier 1 grants (2015-T1-001-175 and RG113/16). A.A.-H. and M.R.A. acknowledge King Abdulaziz City for Science and Technology (KACST) for their financial support through the Center of Excellence for Green Nanotechnologies (CEGN), part of a Joint Centers of Excellence program.
PY - 2019/4/25
Y1 - 2019/4/25
N2 - To investigate the quantum confinement effect on excitons in hybrid perovskites, single-crystal platelets of CH3NH3PbBr3 are grown on mica substrates using one-step chemical vapor deposition. Photoluminescence measurements reveal a monotonous blue shift with a decreasing platelet thickness, which is accompanied by a significant increase in exciton binding energy from approximately 70 to 150 meV. Those phenomena can be attributed to the one-dimensional (1D) quantum confinement effect in the two-dimensional platelets. Furthermore, we develop an analytical model to quantitatively elucidate the 1D confinement effect in such quantum wells with asymmetric barriers. Our analysis indicates that the exciton Bohr radius of single-crystal CH3NH3PbBr3 is compressed from 4.0 nm for the thick (26.2 nm) platelets to 2.2 nm for the thin (5.9 nm) ones. The critical understanding of the 1D quantum confinement effect and the development of a general model to elucidate the exciton properties of asymmetric semiconductor quantum wells pave the way toward developing high-performance optoelectronic heterostructures.
AB - To investigate the quantum confinement effect on excitons in hybrid perovskites, single-crystal platelets of CH3NH3PbBr3 are grown on mica substrates using one-step chemical vapor deposition. Photoluminescence measurements reveal a monotonous blue shift with a decreasing platelet thickness, which is accompanied by a significant increase in exciton binding energy from approximately 70 to 150 meV. Those phenomena can be attributed to the one-dimensional (1D) quantum confinement effect in the two-dimensional platelets. Furthermore, we develop an analytical model to quantitatively elucidate the 1D confinement effect in such quantum wells with asymmetric barriers. Our analysis indicates that the exciton Bohr radius of single-crystal CH3NH3PbBr3 is compressed from 4.0 nm for the thick (26.2 nm) platelets to 2.2 nm for the thin (5.9 nm) ones. The critical understanding of the 1D quantum confinement effect and the development of a general model to elucidate the exciton properties of asymmetric semiconductor quantum wells pave the way toward developing high-performance optoelectronic heterostructures.
UR - http://hdl.handle.net/10754/653035
UR - https://pubs.acs.org/doi/10.1021/acs.jpclett.9b00777
UR - http://www.scopus.com/inward/record.url?scp=85065538347&partnerID=8YFLogxK
U2 - 10.1021/acs.jpclett.9b00777
DO - 10.1021/acs.jpclett.9b00777
M3 - Article
C2 - 31020840
SN - 1948-7185
VL - 10
SP - 2363
EP - 2371
JO - The Journal of Physical Chemistry Letters
JF - The Journal of Physical Chemistry Letters
IS - 10
ER -