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Photochemical Electrocyclic Reactions: Stereochemistry01:26

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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
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Updated: Sep 23, 2025

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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Dye-Sensitized Solar Cells Based on Cu(I) Complexes Containing Catechol Anchor Groups That Operate with Aqueous

Lars E Burmeister1, Florian Doettinger1, Kurt J Haseloff1

  • 1Department of Energy Conversion, Institute of Physical and Theoretical Chemistry, Technische Universität Braunschweig, Rebenring 31, 38106 Braunschweig, Germany.

JACS Au
|August 29, 2025
PubMed
Summary

Novel copper complexes with catechol-functionalized ligands significantly boost solar cell efficiency. These new materials enable stable aqueous electrolytes and demonstrate a 35-fold increase in photoconversion efficiency for dye-sensitized solar cells (DSSCs).

Keywords:
Cu(I) photosensitizersaqueous electrolytescatechol anchor groupsdye-sensitized solar cells (DSSCs)type-II sensitization

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Coordination Chemistry

Background:

  • Developing efficient and stable light-harvesting materials is crucial for advancing solar cell technology.
  • Copper-(I) complexes offer potential as cost-effective alternatives to noble metal sensitizers in dye-sensitized solar cells (DSSCs).
  • Phenanthroline-based ligands are widely explored for their ability to form stable metal complexes with tunable electronic properties.

Purpose of the Study:

  • To design and synthesize novel phenanthroline-based ligands and their corresponding copper-(I) complexes.
  • To investigate the photophysical, electrochemical, and photovoltaic properties of these new materials.
  • To evaluate the performance of the synthesized copper-(I) complexes as sensitizers in n-type dye-sensitized solar cells (DSSCs).

Main Methods:

  • Synthesis of catechol-functionalized phenanthroline ligands (L1, L1') and copper-(I) complexes (C1, C1', C2, C2').
  • Characterization using steady-state and time-resolved spectroscopy, cyclic voltammetry, and density functional theory (DFT) calculations.
  • Fabrication and testing of n-type DSSCs using the synthesized complexes, with performance evaluated by photoconversion efficiency (PCE) and incident photon-to-current efficiency (IPCE).

Main Results:

  • A heteroleptic copper-(I) complex (C2) achieved a photoconversion efficiency (PCE) of 1.88% in n-type DSSCs, a 35-fold improvement over previous diimine-diphosphine copper-(I) based DSSCs.
  • Efficient photoinduced charge injection and interfacial electron transfer were confirmed by IPCE and electrochemical impedance spectroscopy.
  • The catechol anchors facilitated the use of aqueous electrolytes, leading to stable DSSC performance for over 10 days.

Conclusions:

  • Novel phenanthroline-based copper-(I) complexes show significant promise for efficient and stable dye-sensitized solar cells.
  • The dual chromophore system, involving catechol-TiO2 interaction and copper-(I) complex antenna, enhances solar cell performance.
  • The development of stable DSSCs with aqueous electrolytes using these materials represents a significant advancement in photovoltaic research.