Jove
Visualize
Contáctanos
JoVE
x logofacebook logolinkedin logoyoutube logo
ACERCA DE JoVE
Visión GeneralLiderazgoBlogCentro de Ayuda JoVE
AUTORES
Proceso de PublicaciónConsejo EditorialAlcance y PolíticasRevisión por ParesPreguntas FrecuentesEnviar
BIBLIOTECARIOS
TestimoniosSuscripcionesAccesoRecursosConsejo Asesor de BibliotecasPreguntas Frecuentes
INVESTIGACIÓN
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchivo
EDUCACIÓN
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualCentro de Recursos para ProfesoresSitio de Profesores
Términos y Condiciones de Uso
Política de Privacidad
Políticas

Videos de Conceptos Relacionados

Types of Semiconductors01:20

Types of Semiconductors

1.8K
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...
1.8K
Energy Bands in Solids01:01

Energy Bands in Solids

2.4K
Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
 Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states...
2.4K
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
Band Theory02:35

Band Theory

14.6K
When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
14.6K
Fermi Level01:18

Fermi Level

2.5K
The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...
2.5K
Network Covalent Solids02:18

Network Covalent Solids

12.9K
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
12.9K

También podría leer

Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por
Same author

Palladium-catalyzed olefination and arylation of 2-substituted 1,2,3-triazole N-oxides.

Organic letters·2013
Same author

One-stop hybrid coronary revascularization versus coronary artery bypass grafting and percutaneous coronary intervention for the treatment of multivessel coronary artery disease: 3-year follow-up results from a single institution.

Journal of the American College of Cardiology·2013
Same author

Relative contributions of the thalamus and the paraventricular nucleus of the hypothalamus to the cardiac sympathetic afferent reflex.

American journal of physiology. Regulatory, integrative and comparative physiology·2013
Same author

Initial light soaking treatment enables hole transport material to outperform spiro-OMeTAD in solid-state dye-sensitized solar cells.

Journal of the American Chemical Society·2013
Same author

The rice GERMINATION DEFECTIVE 1, encoding a B3 domain transcriptional repressor, regulates seed germination and seedling development by integrating GA and carbohydrate metabolism.

The Plant journal : for cell and molecular biology·2013
Same author

Salvage intensity modulated radiotherapy using endorectal balloon after radical prostatectomy: clinical outcomes.

International journal of urology : official journal of the Japanese Urological Association·2013

Video Experimental Relacionado

Updated: Apr 27, 2026

Developing High Performance GaP/Si Heterojunction Solar Cells
10:31

Developing High Performance GaP/Si Heterojunction Solar Cells

Published on: November 16, 2018

6.7K

Brecha de banda directa entre los alótropos de silicio.

Qianqian Wang1, Bo Xu, Jian Sun

  • 1State Key Laboratory of Metastable Materials Science and Technology, Yanshan University , Qinhuangdao 066004, Hebei Province, China.

Journal of the American Chemical Society
|June 28, 2014
PubMed
Resumen

Los nuevos alótropos de silicio ofrecen una mejor conversión de la energía solar. Estos materiales muestran potencial para la próxima generación de módulos fotovoltaicos, mejorando la utilización de la energía solar.

Más Videos Relacionados

Fabrication and Optimization of Type II Silicon Clathrate Films
06:53

Fabrication and Optimization of Type II Silicon Clathrate Films

Published on: October 14, 2025

1.2K
Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
06:57

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon

Published on: July 17, 2020

2.2K

Videos de Experimentos Relacionados

Last Updated: Apr 27, 2026

Developing High Performance GaP/Si Heterojunction Solar Cells
10:31

Developing High Performance GaP/Si Heterojunction Solar Cells

Published on: November 16, 2018

6.7K
Fabrication and Optimization of Type II Silicon Clathrate Films
06:53

Fabrication and Optimization of Type II Silicon Clathrate Films

Published on: October 14, 2025

1.2K
Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
06:57

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon

Published on: July 17, 2020

2.2K

Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Física de la materia condensada Física de la materia condensada
  • Energía renovable Energía renovable.

Sus antecedentes:

  • El silicio elemental es crucial para la tecnología moderna, especialmente en la industria de las células solares.
  • Las células solares de silicio actuales se enfrentan a limitaciones para aprovechar plenamente la energía solar.
  • Existe una demanda social de soluciones avanzadas de energía limpia.

Objetivo del estudio:

  • Para predecir nuevos alótropos metastables del silicio utilizando métodos computacionales.
  • Identificar estructuras de silicio con espacios óptimos de banda para la conversión de energía solar.
  • Para evaluar las propiedades ópticas de estas nuevas fases de silicio.

Principales métodos:

  • Se emplearon cálculos ab initio para predecir las propiedades de los alotrópicos de silicio.
  • El estudio se centró en predecir estructuras a presión ambiente.
  • Se calcularon las brechas de banda y las propiedades ópticas para varias fases de silicio.

Principales resultados:

  • Se predijeron seis alótropos metastables de silicio con espacios de banda directos o cuasidirrectos (0,39-1,25 eV).
  • Cinco de estos alótropos exhiben brechas de banda dentro del rango óptimo para la eficiencia fotovoltaica.
  • Estas nuevas fases de silicio demuestran propiedades ópticas superiores en comparación con la fase Si-I estándar.

Conclusiones:

  • Los predicidos alótropos de silicio representan candidatos prometedores para las aplicaciones avanzadas de células solares.
  • Estos materiales podrían mejorar significativamente la eficiencia de la conversión de energía solar en energía eléctrica.
  • Las diversas brechas de banda de estas estructuras las hacen adecuadas para módulos fotovoltaicos de múltiples uniones.