Year-end Sale % OFF 
Abstract
All mixed hybrid perovskite (MA(Sn, Pb)(Br,I)3) thin film was fabricated by sequential vacuum evaporation method. To optimize the first layer with PbBr2 and SnI2, we performed different annealing treatments. Further, MA(Sn, Pb)(Br, I)3 thin film was synthesized on the optimized first layer by evaporating MAI and post-annealing. The formed hybrid perovskite thin film exhibited absorptions at 1.0 and 1.7 THz with small absorbance (<10%). Moreover, no chemical and structural defect-incorporated absorption was found. In this study, the possibility of changing terahertz absorption frequency through the mixture of metal cations (Sn+ and Pb+) and halogen anions (Br− and I−) was verified.
Highlights
Organic–inorganic hybrid perovskite (OHP) materials, because of their universal properties such as controllable bandgap, weak exciton binding energy, and high-carrier mobility, are attracting great attention for solar-cell and light-emitting diode applications (D’Innocenzo et al, 2014; Frost et al, 2014; Frost and Walsh, 2016; Pedesseau, 2016; NR Venkatesan, 2018; Yi et al, 2019)
A high THz-wave absorption at 1.58 THz was observed in molecular vibration and rotation in CH3NH3PbI3 (MAPbI3) thin film fabricated by sequential vacuum evaporation (SVE) method, which incorporated CH3NH2 molecular defects in the synthesized thin film (Maeng et al, 2019; 2020b)
The thin films formed by solutionprocessed methods such as 2-step and antisolvent methods are shown with two significant features such as large grain size (>500 nm) and low density of grain boundary that are induced with high carrier mobility in a solar-cell application (Ono and Qi, 2016, 2018)
Summary
Organic–inorganic hybrid perovskite (OHP) materials, because of their universal properties such as controllable bandgap, weak exciton binding energy, and high-carrier mobility, are attracting great attention for solar-cell and light-emitting diode applications (D’Innocenzo et al, 2014; Frost et al, 2014; Frost and Walsh, 2016; Pedesseau, 2016; NR Venkatesan, 2018; Yi et al, 2019). There is no report on the THz Absorption of Mixed Hybrid Perovskite experimental observation of the molecular vibration and rotation in CH3NH3PbI3 (MAPbI3) and α-HC(NH2)2PbI3 (α-FAPbI3) thin films (Lee et al, 2019; Maeng et al, 2019). The contribution of molecular motions is considerably weak in the THz energy range from 0.5 to 3 THz. In MAPbI3 thin films fabricated by a conventional solution-based method, two vibrational modes at 1 and 2 THz, originated from the buckling of the Pb–I–Pb angles and the Pb–I bond vibration, respectively, were observed (La-O-Vorakiat et al, 2016). A high THz-wave absorption at 1.58 THz was observed in MAPbI3 thin film fabricated by sequential vacuum evaporation (SVE) method, which incorporated CH3NH2 molecular defects in the synthesized thin film (Maeng et al, 2019; 2020b). The grain size does not improve significantly (Lee et al, 2019; Maeng et al, 2020a, 2020b)
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.
