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Related Concept Videos

P-N junction01:11

P-N junction

406
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
406
Biasing of P-N Junction01:16

Biasing of P-N Junction

359
The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
359
Types of Semiconductors01:20

Types of Semiconductors

440
Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
440

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Function Nickel Oxide for Perovskite LEDs: Energy Level Modulation and Hole Injection Optimization.

Saike Wang1, Shuo Wei1, Hao Yang1

  • 1State Key Laboratory of Advanced Chemical Power Sources, Frontiers Science Center for New Organic Matter, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin, 300071, P. R. China.

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|April 15, 2025
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Summary

Nickel oxide (NiOx) is a stable inorganic hole transporting layer (HTL) for perovskite light-emitting diodes (PeLEDs). Customizing NiOx properties enhances hole injection, leading to more efficient and stable PeLED devices.

Keywords:
band structurehole transport layernickel oxideperovskite light‐emitting diodes

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Chemistry

Background:

  • Perovskite light-emitting diodes (PeLEDs) require stable architectures for improved operational longevity.
  • Inorganic hole transporting layers (HTLs) are key to enhancing PeLED stability.
  • Nickel oxide (NiOx) presents desirable properties like stability, electron-blocking, and solution processability for HTLs.

Purpose of the Study:

  • To review the fundamental properties of NiOx as an inorganic HTL for PeLEDs.
  • To explore the relationship between NiOx synthesis, morphology, and energy levels.
  • To summarize strategies for tuning NiOx energy levels for improved PeLED performance.

Main Methods:

  • Review of NiOx band structure and surface chemistry.
  • Analysis of solution-processed NiOx synthesis and morphology-property correlations.
  • Summary of energy level tuning strategies for NiOx.

Main Results:

  • NiOx exhibits intrinsic stability and good electron-blocking capabilities.
  • The morphology of NiOx is correlated with its energy level.
  • Various strategies exist for tuning NiOx energy levels.

Conclusions:

  • Understanding and customizing NiOx properties are crucial for efficient hole injection in PeLEDs.
  • NiOx is a promising material for developing stable and efficient PeLEDs.
  • This review offers insights into advancing NiOx-based PeLED technology.