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Related Concept Videos

Photochemical Electrocyclic Reactions: Stereochemistry01:26

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
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

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.

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Updated: May 25, 2026

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

Published on: October 1, 2019

Lead Halide Perovskite Photoelectrocatalysis.

Virgil Andrei1,2,3

  • 1School of Materials Science and Engineering, Nanyang Technological University, Singapore, Singapore.

Advanced Materials (Deerfield Beach, Fla.)
|May 23, 2026
PubMed
Summary

Lead halide perovskites show promise for converting light into fuels and chemicals. This study details photoelectrode design to enhance solar-to-chemical conversion efficiency and product selectivity.

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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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Published on: October 1, 2019

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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Area of Science:

  • Materials Science
  • Photochemistry
  • Renewable Energy

Background:

  • Lead halide perovskites are exceptional light-harvesting materials.
  • Progress in solar cells highlights their potential for solar fuel production.
  • Applications include conversion of water, CO2, and organic waste.

Purpose of the Study:

  • To advance rational photoelectrode design for improved solar-to-chemical conversion.
  • To expand the scope of products and scalability of perovskite-based systems.
  • To investigate strategies for suppressing degradation and controlling product selectivity.

Main Methods:

  • Device architecture optimization for performance enhancement.
  • Development of strategies to mitigate moisture-induced degradation.
  • Fundamental studies to control selectivity in CO2 reduction.

Main Results:

  • Demonstrated improvements in solar-to-chemical conversion efficiency.
  • Identified pathways to suppress degradation and enhance stability.
  • Established mechanisms for steering selectivity of CO2 reduction products.

Conclusions:

  • Rational photoelectrode design is key to efficient solar-to-chemical conversion.
  • Insights are generalizable to thin-film buried-junction photoelectrodes.
  • Perovskite technology offers unique applicability for real-world solar fuel production.