July 2022

Due to the wide bandgap of Cs2AgBiBr6 film, its light absorption capacity is severely limited and its optoelectronic conversion efficiency is usually less than 4.23%. In this paper, the bandgap of the Cs2AgBiBr6 membrane can be adjusted from 2.18eV to 1.64eV using the hydrogenation method, the cell is improved to 6.37% and has excellent environmental stability.Interstitial doping of hydrogen atoms into the Cs2AgBiBr6 lattice could not only adjust the energy levels of its valence and conduction bands, but also optimize carrier mobility and carrier lifetime. Hydrogenating treatment of the Cs2AgBiBr6 film from 0s to 1200 s, the light absorption at the wavelength above 496 nm increases. At the same time, the carrier con- centration of the hydrogenated Cs2AgBiBr6 films increases from 1.42 × 1012 cm−3 to 5.96 × 1012 cm−3, and the carrier mobility and lifetime have also been largely improved from 1.71 cm2V−1s−1 and 18.85 ns, to 9.28 cm2V−1s−1 and 41.86 ns, respectively.Fabrication of hydrogenated Cs2AgBiBr6 films.

The solubility of Cs2AgBiBr6 in dimethylsulfoxide (DMSO) solution is about 0.6 mol/L.
Cs2AgBiBr6 perovskite precursor solution (0.6 mol/L) was prepared by dissolving 212.81 mg CsBr, 187.77 mg AgBr and 448.68 mg BiBr3 in 1 mL anhydrous solvent of DMSO.
The perovskite precursor solution was stirred in a glove box at 70 oC for 12 h until the solutes were completely dissolved in DMSO solvent and filtered through a 0.45 μm poly tetra fluoro ethylene (PTFE) filtering membrane.
The high quality Cs2AgBiBr6 film was first manufactured using the traditional one-step spin coating solution method, which consists of a face-centered cubic structural phase (Fm3m) and exhibits a yellow color.
Then perovskite membrane was hydrogenated for different times (600 and 1200 seconds) using plasma treatment in a mixed gas environment of hydrogen (H2) and argon (Ar).
When the hydrogenation time is up to 1200 s, the Cs2AgBiBr6 perovskite films remain solid phase (Fm3m) without any phase transition, but the color of the films changes from yellow to black and the surface morphology of the perovskite film becomes smooth.

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RESEARCH
研究内容

Simulating Defensive Trajectories in American Football for Predicting League Average Defensive Movements
Schmid, M., Blauberger, P., & Lames, M. (2021). Frontiers in Sports and Active Living, 177.

A Review on Bilevel Optimization: From Classical to Evolutionary Approaches and Applications
Ankur Sinha, Pekka Malo, Kalyanmoy Deb

Transition-Metal-Based Electrocatalysts as Cocatalysts for Photoelectrochemical Water Splitting: A Mini Review
Deng Li, Jingying Shi, and Can Li

Hydrogen generation via photoelectrochemical water splitting using chemically exfoliated MoS2 layers
AIP Advances Vol.6 015315(2016)
R. K. Jashi, S. Shukla, S. Saxena, et al.

Machine learning & artificial intelligence in the quantum domain
Dunjko & Briegel

Ab Initio Molecular Dynamics of CdSe Quantum-Dot-Doped Glasses
Wenke Li.et.al, J. Am. Chem. Soc. 2020, 142, 8, 3905–3912

“Deep Reinforcement Learning for Quantum State Preparation with Weak Nonlinear Measurements”
Riccardo Porotti et al., (Max Planck Institute for the Science of Light), Quantum 6, 747 (2022).

Attention Is All You Need
Vaswani, Ashish, et al. Advances in neural information processing systems 30 (2017).

Opportunities for neuromorphic computing algorithms and applications
Schuman, C. D. et al. Opportunities for neuromorphic computing algorithms and applications. Nature Computational Science 2, 10–19 (2022)

Metal Halide Perovskite Materials for Solar Cells with Long-Term Stability
Zhao, Z., Gu, F., Rao, H., Ye, S., Liu, Z., Bian, Z., Huang, C., Adv. Energy Mater. 9, 1802671 (2019).