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Related Concept Videos

Semiconductors01:22

Semiconductors

1.8K
There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
1.8K
Alkyl Halides02:45

Alkyl Halides

21.3K
Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
21.3K
Types of Semiconductors01:20

Types of Semiconductors

1.7K
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...
1.7K
Electrophilic Addition to Alkynes: Hydrohalogenation02:35

Electrophilic Addition to Alkynes: Hydrohalogenation

12.0K
Electrophilic addition of hydrogen halides, HX (X = Cl, Br or I) to alkenes forms alkyl halides as per Markovnikov's rule, where the hydrogen gets added to the less substituted carbon of the double bond. Hydrohalogenation of alkynes takes place in a similar manner, with the first addition of HX forming a vinyl halide and the second giving a geminal dihalide.
12.0K
Halogens03:01

Halogens

24.0K
Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. Astatine is a highly unstable radioactive element, so currently, most of its properties are unknown due to its short half-life. Tennessine is a synthetic element also predicted to be in this group. 
24.0K
Schottky Barrier Diode01:27

Schottky Barrier Diode

1.2K
Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
1.2K

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Related Experiment Video

Updated: Mar 21, 2026

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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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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Halide Perovskites: Poor Man's High-Performance Semiconductors.

Constantinos C Stoumpos1, Mercouri G Kanatzidis1

  • 1Department of Chemistry, Northwestern University Evanston, IL, 60208, USA.

Advanced Materials (Deerfield Beach, Fla.)
|May 14, 2016
PubMed
Summary

Halide perovskites are advanced semiconductors revolutionizing solar cells. Their unique electronic and optical properties offer exciting potential beyond photovoltaics for new technologies.

Keywords:
electrical propertiesoptical propertiesperovskitessemiconductor devicessemiconductors

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Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
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Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells

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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Semiconductor Technology

Background:

  • Halide perovskites are a rapidly advancing class of semiconductors.
  • They have achieved significant success in solid-state heterojunction solar cells, reaching 20% efficiency.
  • Their potential extends beyond photovoltaics due to unique material properties.

Purpose of the Study:

  • To discuss the nature of halide perovskites from a materials perspective.
  • To highlight important classes and their properties.
  • To review optical and electrical characteristics and recent achievements.

Main Methods:

  • Literature review and synthesis of existing research.
  • Analysis of material properties, focusing on optical and electrical characteristics.
  • Discussion of key compound classes and their applications.

Main Results:

  • Halide perovskites exhibit unique optical and electrical properties derived from their electronic structure.
  • Photovoltaic performance is a key success, but not the sole application.
  • Significant advancements have been made, alongside ongoing research and debate.

Conclusions:

  • Halide perovskites represent a novel class of high-performance semiconductors.
  • Their exotic properties offer broad technological opportunities.
  • Further research is needed to fully explore and address controversies in the field.