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Epitaxial Growth of Perovskite Strontium Titanate on Germanium via Atomic Layer Deposition

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Published on: July 26, 2016

Gas-Phase Construction of Compact Capping Layers for High-Performance Halide Perovskite X-Ray Detectors.

Bin Zhang^1,2, Chuanyun Hao¹, Shoufeng Zhang³

¹Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology, Center for Intense Laser Application Technology (iLaT) and College of Engineering Physics, Shenzhen Technology University, Shenzhen, 518118, People's Republic of China.

Nano-Micro Letters

|December 19, 2025

Summary

Researchers developed a precise gas-phase method to create 2D/3D halide perovskite heterostructures for X-ray detection. This method enhances stability and optoelectronic properties, leading to high-performance X-ray detectors.

Keywords:

Halide perovskite Heterostructure Interface Ion migration X-ray detection

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Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

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Published on: September 8, 2017

Area of Science:

Materials Science
Solid-State Physics
Optoelectronics

Background:

Halide perovskites show promise for cost-effective X-ray detection.
Heterostructures of 3D and low-dimensional perovskites offer improved stability and reduced ion migration.
Precise construction methods and understanding of structure-property relationships are lacking.

Purpose of the Study:

To develop a method for precise construction of halide perovskite heterostructures.
To investigate the structure-dependent optoelectronic properties of these heterostructures.
To advance the development of high-performance, cost-effective X-ray detectors.

Main Methods:

A gas-phase method was employed to grow 2D perovskites directly onto 3D perovskites with nanoscale accuracy.
The steric hindrance of organic layers in 2D perovskites was analyzed for its effect on ion migration.
MAPbBr3 single crystals capped with (PA)2PbBr4 were used to fabricate X-ray detectors.

Main Results:

The gas-phase method achieved nanoscale precision in constructing 2D/3D perovskite heterostructures.
Larger steric hindrance in 2D perovskite layers significantly reduced ion migration, trap states, and improved stability.
The fabricated X-ray detector demonstrated high sensitivity (22,245 μC Gyair⁻¹ cm⁻²), fast response (240 μs), and low dark current drift (1.17 × 10⁻⁴ nA cm⁻¹ s⁻¹ V⁻¹).

Conclusions:

A precise synthesis method for perovskite-based heterostructures was successfully developed.
The study provides fundamental insights into the relationship between lattice structure and optoelectronic properties.
The findings pave the way for high-performance and cost-effective perovskite X-ray detectors.