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Network Covalent Solids

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...

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Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells

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High-Entropy Design for 2D Halide Perovskite.

Yan Song¹, Shun Lan¹, Bingbing Yang^1,2

¹State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China.

Journal of the American Chemical Society

|July 9, 2024

Summary

High-entropy design in hybrid perovskites enhances stability and simplifies synthesis. This approach yields tunable, broadband-emitting materials with improved humidity resistance for optoelectronics.

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Area of Science:

Materials Science
Solid-State Chemistry
Nanotechnology

Background:

Hybrid halide perovskites offer tunable optoelectronic properties but suffer from instability and lead toxicity.
Practical applications are hindered by moisture sensitivity, lead content, and complex fabrication.

Purpose of the Study:

To develop a facile method for synthesizing humidity-stable hybrid perovskites.
To investigate the impact of configurational entropy on perovskite phase stabilization and properties.
To address the bottlenecks of instability and complex processing in hybrid perovskite materials.

Main Methods:

Simultaneous configurational entropy design at A, B, and X sites in (CHA)2PbBr4 two-dimensional (2D) hybrid perovskites.
Facilitated crystallization process under mild conditions.
Assessment of material stability in deionized water and characterization of optoelectronic properties.

Main Results:

High-entropy effect stabilizes the hybrid perovskite phase and simplifies crystallization.
Synthesized high-entropy 2D perovskites exhibit tunable band gaps, broadband emission, and long carrier lifetimes.
High-entropy crystals demonstrated significantly improved humidity stability compared to the pristine material.

Conclusions:

Configurational entropy design offers a facile route to humidity-stable hybrid perovskites.
This approach accelerates the development of optoelectronic and light-emitting devices.
The findings facilitate the commercialization of lead-containing halide perovskites.