Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Thermal and Photochemical Electrocyclic Reactions: Overview

Thermal and Photochemical Electrocyclic Reactions: Overview

Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.

P-N junction

P-N junction

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...

Photosystem I

Photosystem I

Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...

Photochemical Electrocyclic Reactions: Stereochemistry

Photochemical Electrocyclic Reactions: Stereochemistry

The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation

Types of Semiconductors

Types of Semiconductors

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...

The Z-Scheme of Electron Transport in Photosynthesis

The Z-Scheme of Electron Transport in Photosynthesis

The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Anisotropic Exciton Transport in a Lamellar CsPbBr<sub>3</sub> Nanocrystal Superlattice.

Nano letters·2026

Same author

1D Silver Organochalcogenide Semiconductors: Color Tunable Luminescence, Polarized Emission, and Long-Range Exciton Diffusion.

Journal of the American Chemical Society·2025

Same author

Systematic Bandgap Engineering of a 2D Organic-Inorganic Chalcogenide Semiconductor via Ligand Modification.

Journal of the American Chemical Society·2025

Same author

Spatially resolved photocatalytic active sites and quantum efficiency in a 2D semiconductor.

Nature communications·2025

Same author

Ligand Shell Thickness of Colloidal Nanocrystals: A Comparison of Small-Angle Neutron and X-ray Scattering.

Journal of the American Chemical Society·2025

Same author

Layered Metal-Organic Chalcogenides: 2D Optoelectronics in 3D Self-Assembled Semiconductors.

ACS nano·2025

Search research articles

Related Experiment Video

Updated: May 7, 2025

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells

Published on: March 19, 2017

Exciton Transport in Perovskite Materials.

Thomas John Sheehan¹, Seryio Saris¹, William A Tisdale¹

¹Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.

Advanced Materials (Deerfield Beach, Fla.)

|December 31, 2024

Summary

This review explores excitons in halide perovskites, focusing on low-dimensional materials and nanoscale effects. Understanding exciton behavior is key to advancing optoelectronic applications like solar cells and LEDs.

Keywords:

2D materials energy transfer exciton perovskite quantum dot

More Related Videos

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

Published on: September 8, 2017

Flash Infrared Annealing for Perovskite Solar Cell Processing

Flash Infrared Annealing for Perovskite Solar Cell Processing

Published on: February 3, 2021

Related Experiment Videos

Last Updated: May 7, 2025

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells

Published on: March 19, 2017

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

Published on: September 8, 2017

Flash Infrared Annealing for Perovskite Solar Cell Processing

Flash Infrared Annealing for Perovskite Solar Cell Processing

Published on: February 3, 2021

Area of Science:

Materials Science
Condensed Matter Physics
Optoelectronics

Background:

Halide perovskites are versatile materials for optoelectronics due to tunable properties.
Excitons, light-induced electronic excitations, are fundamental to perovskite optoelectronic performance.
Synthetic flexibility allows control over perovskite composition, structure, and morphology.

Purpose of the Study:

To review exciton properties and behavior in halide perovskites.
To emphasize low-dimensional perovskites and nanoscale morphology impacts.
To discuss energy migration theory and novel observations in perovskite nanomaterials.

Main Methods:

Literature review of exciton physics in halide perovskites.
Introduction to excitonic energy migration theory in nanomaterials.
Exploration of recent experimental and theoretical findings.

Main Results:

Detailed discussion of exciton dynamics in various halide perovskite structures.
Highlighting the influence of dimensionality and morphology on excitonic behavior.
Presentation of novel observations that refine current understanding of exciton physics.

Conclusions:

Exciton behavior is crucial for halide perovskite optoelectronic applications.
Low-dimensional and nanostructured perovskites offer unique exciton properties.
Further research into exciton physics will unlock new technological advancements.