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Author Grigioni, I.; Polo, A.; Dozzi, M.V.; Stamplecoskie, K.G.; Jara, D.H.; Kamat, P.V.; Selli, E. doi  openurl
  Title Enhanced Charge Carrier Separation in WO3/BiVO4 Photoanodes Achieved via Light Absorption in the BiVO4 Layer Type
  Year 2022 Publication ACS Applied Energy Materials Abbreviated Journal ACS Appl. Energy Mater.  
  Volume 5 Issue 11 Pages 1314213148  
  Keywords solar water oxidation; heterojunction; ultrafast transient absorption; photoactive layer thickness; filter effect  
  Abstract Photoelectrochemical (PEC) water splitting converts solar light and water into oxygen and energy-rich hydrogen. WO3/BiVO4 heterojunction photoanodes perform much better than the separate oxide components, though internal charge recombination undermines their PEC performance when both oxides absorb light. Here we exploit the BiVO4 layer to sensitize WO3 to visible light and shield it from direct photoexcitation to overcome this efficiency loss. PEC experiments and ultrafast transient absorption spectroscopy performed by frontside (through BiVO4) or backside (through WO3) irradiating photoanodes with different BiVO4 layer thickness demonstrate that irradiation through BiVO4 is beneficial for charge separation. Optimized electrodes irradiated through BiVO4 show 40% higher photocurrent density compared to backside irradiation.  
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  ISSN 2574-0962 ISBN Medium  
  Area Expedition Conference  
  Notes Approved  
  Call Number UAI @ alexi.delcanto @ Serial 1732  
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Author Nam, M.; Park, Y.; Lee, C.; Kim, G.; Larrain, F.A.; Fuente-Hernandez, C.; Ko, D.H.; Kippelen, B. doi  openurl
  Title Single-layer organic photovoltaics fabricated via solution-based electrical doping of ternary bulk heterojunction films Type
  Year 2023 Publication Chemical Engineering Journal Abbreviated Journal Chem. Eng. J.  
  Volume 466 Issue Pages 143340  
  Keywords Organic photovoltaics; Single -layer geometry; Electrical doping; Phosphomolybdic acid; Ternary bulk heterojunction; Indoor energy harvesting  
  Abstract The commercial viability of organic photovoltaics (OPVs) can be improved by simplifying their device geometry and easing fabrication complexity. Here, we demonstrate that solution-based p-type electrical doping of ternary bulk heterojunction (BHJ) films, which comprise 2 donor polymers and 1 fullerene acceptor (2D:1A), enables the realization of efficient single-layer OPVs. Systematic and detailed investigations of the optoelectronic charac-teristics of films with varying donor ratios, and their photovoltaic performance, demonstrate p-type electrical doping via post-process immersion into a 12-molybdophosphoric acid hydrate (PMA) solution, resulting in a reduced trap density and charge recombination without significantly changing the BHJ morphology. Further-more, PMA doping of films comprising optimized ternary blend compositions and polyethylenimine enables the demonstration of single-layer OPVs with economic top electrode metals and a high level of performance under outdoor and indoor illumination conditions. These PMA-doped 2D:1A BHJ films are an attractive platform to reduce the efficiency-cost gap and accelerate the commercialization of OPVs for emerging applications.  
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  ISSN 1385-8947 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:001007214500001 Approved  
  Call Number UAI @ alexi.delcanto @ Serial 1823  
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