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Title: Excitonic gain and laser emission from mixed-cation halide perovskite thin films

Abstract

Organic–inorganic halide perovskites have recently developed into a potential semiconductor coherent light emitter candidate beyond their promise in solar cell applications. However, despite the ample demonstrations of perovskite lasers, experimental results on the origin of optical gain in perovskites are still elusive. Here, we analyze the excitonic gain in the green from mixed-cation halide perovskites Cs 0.17[CH(NH 2) 2] 0.83PbBr 3 (Cs 0.17FA 0.83PbBr 3) by both low temperature absorption/emission spectroscopies and ultrafast pump–probe transient absorption experiments. The perovskite thin films show a robust excitonic feature up to room temperature, with estimated exciton binding energy E b = 43.8 meV, which can be maintained under high electronic excitations that are required for lasers. By using a high-quality (Q = 1350) vertical cavity consisting of sputtered dielectric HfO 2/SiO 2 distributed Bragg reflectors with perovskite optical gain medium embedded inside, we have demonstrated excitonic-gain-enabled optically pumped lasing, with improved threshold of 13.5 ± 1.4 μJ/cm 2 and device longevity lifetime >35 h (10 8 laser shots) at ambient environment under sustained pulsed optical excitations (3.493 eV, τ pulse = 0.34 ns, 1 kHz). Understanding and exploiting excitonic gain from perovskite thin film materials may help to further boost the performance ofmore » perovskite-based lasers.« less

Authors:
ORCiD logo [1];  [2]
  1. Brown Univ., Providence, RI (United States). School of Engineering
  2. Brown Univ., Providence, RI (United States). School of Engineering, and Dept. of Physics
Publication Date:
Research Org.:
Brown Univ., Providence, RI (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1471743
Alternate Identifier(s):
OSTI ID: 1502474
Grant/Contract Number:  
FG02-07ER46387
Resource Type:
Journal Article: Published Article
Journal Name:
Optica
Additional Journal Information:
Journal Volume: 5; Journal Issue: 9; Journal ID: ISSN 2334-2536
Publisher:
Optical Society of America
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Chen, Songtao, and Nurmikko, Arto. Excitonic gain and laser emission from mixed-cation halide perovskite thin films. United States: N. p., 2018. Web. doi:10.1364/optica.5.001141.
Chen, Songtao, & Nurmikko, Arto. Excitonic gain and laser emission from mixed-cation halide perovskite thin films. United States. doi:10.1364/optica.5.001141.
Chen, Songtao, and Nurmikko, Arto. Thu . "Excitonic gain and laser emission from mixed-cation halide perovskite thin films". United States. doi:10.1364/optica.5.001141.
@article{osti_1471743,
title = {Excitonic gain and laser emission from mixed-cation halide perovskite thin films},
author = {Chen, Songtao and Nurmikko, Arto},
abstractNote = {Organic–inorganic halide perovskites have recently developed into a potential semiconductor coherent light emitter candidate beyond their promise in solar cell applications. However, despite the ample demonstrations of perovskite lasers, experimental results on the origin of optical gain in perovskites are still elusive. Here, we analyze the excitonic gain in the green from mixed-cation halide perovskites Cs0.17[CH(NH2)2]0.83PbBr3 (Cs0.17FA0.83PbBr3) by both low temperature absorption/emission spectroscopies and ultrafast pump–probe transient absorption experiments. The perovskite thin films show a robust excitonic feature up to room temperature, with estimated exciton binding energy Eb = 43.8 meV, which can be maintained under high electronic excitations that are required for lasers. By using a high-quality (Q = 1350) vertical cavity consisting of sputtered dielectric HfO2/SiO2 distributed Bragg reflectors with perovskite optical gain medium embedded inside, we have demonstrated excitonic-gain-enabled optically pumped lasing, with improved threshold of 13.5 ± 1.4 μJ/cm2 and device longevity lifetime >35 h (108 laser shots) at ambient environment under sustained pulsed optical excitations (3.493 eV, τpulse = 0.34 ns, 1 kHz). Understanding and exploiting excitonic gain from perovskite thin film materials may help to further boost the performance of perovskite-based lasers.},
doi = {10.1364/optica.5.001141},
journal = {Optica},
issn = {2334-2536},
number = 9,
volume = 5,
place = {United States},
year = {2018},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1364/optica.5.001141

Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

Figures / Tables:

Fig. 1. Fig. 1. : (a) Scanning electron microscope image of surface morphology of a Cs0.17FA0.83PbBr3 film on a planar quartz substrate. (b) Grain size distribution of the mixed-cation perovskite film, with Gaussian fit (black line) yielding mean value of 79 nm and standard deviation of 51 nm. (c) Xray diffraction patternmore » comparison betweenCs0.17FA0.83PbBr3 and control FAPbBr3 films, with zoom-in of (001) peak shown on the right.« less

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.