Abstract
The high crystal quality of formamidium lead bromide perovskite (CH(NH2)2PbBr3 = FAPbBr3) was infiltrated in a mesoporous TiO2 network. Then, high-quality FAPbBr3 films were evaluated as active lasing media, and were irradiated with a picosecond pulsed laser to demonstrate amplified spontaneous emission (ASE), which is a better benchmark of its intrinsic suitability for gain applications. The behavior was investigated using two excitation wavelengths of 440 nm and 500 nm. Due to the wavelength-dependent absorbance spectrum and the presence of a surface adsorption layer that could be reduced using the shorter 440 nm wavelength, the ASE power dependence was strongly reliant on the excitation wavelength. The ASE state was achieved with a threshold energy density of ~200 µJ/cm2 under 440 nm excitation. Excitation at 500 nm, on the other hand, needed a higher threshold energy density of ~255 µJ/cm2. The ASE threshold carrier density, on the other hand, was expected to be ~4.5 × 1018 cm−3 for both excitations. A redshift of the ASE peak was detected as bandgap renormalization (BGR), and a BGR constant of ~5–7 × 10−9 eV cm was obtained.
Highlights
Hybrid organic–inorganic metal halide-based perovskites are a new emerging class of photovoltaic materials due to their high absorption coefficients, long-range balanced electron and hole transport lengths, and high carrier mobilities [1,2,3,4,5,6,7]
We investigate Amplified Spontaneous Emission (ASE) as a better benchmark of its intrinsic suitability for gain applications in a high quality FAPbBr3 perovskite film under different excitation wavelengths
FAPbBr3 Perovskite cannot absorb more visible light, owing to the fact that its absorption edge is located at about 520 nm [27]
Summary
Hybrid organic–inorganic metal halide-based perovskites are a new emerging class of photovoltaic materials due to their high absorption coefficients, long-range balanced electron and hole transport lengths, and high carrier mobilities [1,2,3,4,5,6,7]. The crystalline structure of hybrid perovskite materials is ABX3, with A being an organic molecule, B being an inorganic metal (Pb, Cs), and X being a halogen (Cl, Br, I, or mixed Cl/I, Br/I, and Cl/Br). Besides their recent extraordinary success as solar-light-harvesting materials, perovskite materials formerly showed a promising potential to be used as active layers in light emitting diodes (LEDs) and lasing applications [8,9,10,11,12]. 3D hybrid perovskites, which have much smaller organic cations such as methylammonium (MA) or formamidinium (FA), were demonstrated as promising materials for light emitting diodes (LEDs) and lasing applications [13,14,15,16,17,18,19]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
