Hybrid CIGS-Cobalt Quaterpyridine Photocathode with Backside Illumination: A New Paradigm for Solar Fuel Production

Ichou H., Choubrac L., Suna G., Sarkar D., Marques Cordeiro Junior P. J., Diring S., ...More

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, vol.64, no.8, 2025 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 64 Issue: 8
  • Publication Date: 2025
  • Doi Number: 10.1002/anie.202423727
  • Journal Name: ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, L'Année philologique, Agricultural & Environmental Science Database, Applied Science & Technology Source, Aquatic Science & Fisheries Abstracts (ASFA), CAB Abstracts, Chemical Abstracts Core, Chimica, Compendex, EMBASE, Veterinary Science Database, Nature Index
  • Keywords: Artificial Photosynthesis, Carbon Dioxide Reduction, Chalcopyrite, Photoelectrochemical Cells
  • Istanbul University Affiliated: No

Abstract

Chalcogenide-based thin-film solar cell optimized for rear illumination and used for CO2 reduction is presented. Central to this innovation is a thinner, Cu(In,Ga)S-2 chalcopyrite absorber coated with a robust metallic top layer, which potentially surpasses the performance of conventional front-illuminated designs. Using cobalt quaterpyridine molecular catalyst, photocurrent densities for CO2 reduction exceeding 10mA/cm(2) at 0.0V vs. RHE under 1 Sun illumination, and ca. 16 mA/cm(2) at -0.25V vs. RHE were achieved in voltammetry experiments. Controlled potential electrolysis showed catalytic activity over 20h with selectivity for CO ranging from >92% (first 4 hours) to 86% at the end of the experiment. This approach opens limitless possibilities for employing various reduction catalysts, extending far beyond CO2 reduction. It imposes minimal constraints on absorption properties, immobilization methods, and catalyst nature, setting the stage for high-performance, adaptable PEC devices.