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What is an Electrochemical Gradient?01:26

What is an Electrochemical Gradient?

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Adenosine triphosphate, or ATP, is considered the primary energy source in cells. However, energy can also be stored in the electrochemical gradient of an ion across the plasma membrane, which is determined by two factors: its chemical and electrical gradients.
The chemical gradient relies on differences in the abundance of a substance on the outside versus the inside of a cell and flows from areas of high to low ion concentration. In contrast, the electrical gradient revolves around an...
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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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Compositional gradient engineering and applications in halide perovskites.

Junyu Li1, Zeyao Han1, Jiaxin Liu1

  • 1School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China. xiaobaoxu@njust.edu.cn.

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|April 12, 2023
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Summary
This summary is machine-generated.

Gradient engineering in organic-inorganic halide perovskites (HPs) enables single-layer multi-band applications. This review details methods, challenges, and applications of compositional gradient HPs for advanced optoelectronics.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Organic-inorganic halide perovskites (HPs) are promising for solar cells and LEDs due to their optoelectronic properties and solution processability.
  • Their soft lattice allows compositional tuning for bandgap regulation, but conventional HPs are compositionally homogeneous.
  • Achieving multi-band detection/emission typically requires complex multi-device systems.

Purpose of the Study:

  • To review gradient engineering methods for creating multi-component compositional gradients in HP active layers.
  • To compare the advantages and limitations of various gradient engineering techniques.
  • To discuss the stability of gradient structures and their applications.

Main Methods:

  • Summarizing various gradient engineering strategies for different HP forms.
  • Analyzing the impact of entropy-driven ion diffusion on compositional homogeneity.
  • Investigating applications that leverage gradient bandgaps for enhanced performance.

Main Results:

  • Gradient engineering offers a pathway to create single-layer devices with tunable bandgaps.
  • Compositional gradients can improve carrier extraction and enable functional integration within a single device.
  • Stability remains a key consideration due to ion diffusion favoring homogeneity.

Conclusions:

  • Gradient engineering in HPs is a promising approach to overcome limitations of homogeneous active layers.
  • Further development of gradient HP fabrication and stability is crucial for advanced optoelectronic applications.
  • These engineered HPs facilitate carrier extraction and functional integration, paving the way for complex systems on a single device.