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P-N junction

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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...
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According to valence bond theory, a covalent bond results when: (1) an orbital on one atom overlaps an orbital on a second atom, and (2) the single electrons in each orbital combine to form an electron pair. The strength of a covalent bond depends on the extent of overlap of the orbitals involved. Maximum overlap is possible when the orbitals overlap on a direct line between the two nuclei.
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When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Related Experiment Video

Updated: Jul 3, 2025

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
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Ionic Bonding Without Directionality Facilitates Efficient Interfacial Bridging for Perovskite Solar Cells.

Lulan Chen1, Letian Chen1, Zijing Chen2

  • 1Institute of New Energy Material Chemistry, School of Materials Science and Engineering, Renewable Energy Conversion and Storage Center, Nankai University, Tianjin, 300350, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|February 11, 2024
PubMed
Summary

Potassium ions facilitate perovskite solar cell passivation by forming ionic bonds, enabling molecular rotation for defect reduction and improved efficiency. This ionic-coordinate synergy enhances device performance and stability.

Keywords:
coordinate bondhysteresis eliminationinterface bridgingion migration ionic bondmulti‐carboxylate potassium saltsperovskite solar cells

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Interface passivation is crucial for perovskite solar cells (PSCs) to minimize defects and ion migration.
  • Existing Lewis acid-base passivation strategies require precise molecular orientation, limiting molecule selection.
  • Buried interfaces in PSCs present challenges for effective passivation due to orientation constraints.

Purpose of the Study:

  • To investigate a novel passivation strategy for perovskite solar cells utilizing ionic bonding.
  • To explore the role of potassium ions in facilitating interface passivation.
  • To enhance the efficiency and stability of perovskite solar cells by addressing interface defects.

Main Methods:

  • Investigated the migration of potassium ions within the perovskite structure.
  • Analyzed the formation of K-Ix ionic bonds at the perovskite interface.
  • Studied the interaction between ionic bonding, molecular backbone rotation, and polar group chelation with Pb.

Main Results:

  • Potassium ions form directional-independent ionic bonds (K-Ix) with iodine, enabling molecular rotation.
  • This facilitates carboxyl group chelation with Pb, forming a closed-loop structure at the buried interface.
  • Achieved high PSC efficiency exceeding 24.5% (0.09 cm²) and a mini-module efficiency of 21% (12.4 cm²).

Conclusions:

  • Synergistic ionic-coordinate bonding effectively passivates perovskite solar cell interfaces.
  • The strategy reduces defects, modifies the electric field, and immobilizes iodine, eliminating hysteresis.
  • Provides a new molecular design guideline for enhancing PSC performance and stability.