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Related Concept Videos

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

Alkenes can be dihydroxylated using potassium permanganate. The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.

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Related Experiment Video

Updated: Jun 11, 2026

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
11:38

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α-Lipoic Acid Mediates Rapid Spiro-OMeTAD Doping for High-Performance Perovskite Solar Cells.

Jiarong Wang1,2, Shibing Zou1, Ligang Yuan3

  • 1School of Environment and Energy, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, South China University of Technology, Guangzhou 510000, China.

ACS Applied Materials & Interfaces
|September 11, 2025
PubMed
Summary

α-lipoic acid (LA) enhances perovskite solar cell stability by stabilizing the spiro-OMeTAD layer and reducing ion migration. This improves power conversion efficiency and operational longevity.

Keywords:
oxidation regulationperovskite solar cellsspiro-OMeTADstability modulationα-lipoic acid

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Instability in spiro-OMeTAD-based perovskite solar cells (PSCs) is linked to ion migration and spiro-OMeTAD oxidation.
  • Current doping methods using lithium bis(trifluoromethane)sulfonimide contribute to these stability issues.

Purpose of the Study:

  • To introduce α-lipoic acid (LA) as a multifunctional additive to enhance the stability and efficiency of PSCs.
  • To investigate LA's mechanism in stabilizing the hole transport layer and mitigating ion movement.

Main Methods:

  • Incorporation of α-lipoic acid (LA) into the spiro-OMeTAD hole transport layer.
  • Characterization of device performance, including power conversion efficiency (PCE) and operational stability under maximum power point (MPP) tracking.
  • Analysis of interfacial properties and ion migration dynamics.

Main Results:

  • Optimized LA-doped PSCs achieved a PCE of 25.05%, compared to 22.54% for control devices.
  • Enhanced operational stability was observed, with T83 reaching 1056 hours for LA-doped devices versus T80 of 528 hours for controls.
  • LA effectively passivated interfacial defects and reduced ion migration by precipitating excess Li+ ions.

Conclusions:

  • α-lipoic acid (LA) is a promising additive for improving the efficiency and long-term stability of spiro-OMeTAD-based PSCs.
  • LA's multifunctional role in hole transport layer formation, ion management, and defect passivation offers a streamlined fabrication approach.
  • This strategy provides a pathway for developing more robust and efficient perovskite solar cell technologies.