Document Detail


Resonant light trapping in ultrathin films for water splitting.
MedLine Citation:
PMID:  23142836     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Semiconductor photoelectrodes for solar hydrogen production by water photoelectrolysis must employ stable, non-toxic, abundant and inexpensive visible-light absorbers. Iron oxide (α-Fe(2)O(3)) is one of few materials meeting these requirements, but its poor transport properties present challenges for efficient charge-carrier generation, separation, collection and injection. Here we show that these challenges can be addressed by means of resonant light trapping in ultrathin films designed as optical cavities. Interference between forward- and backward-propagating waves enhances the light absorption in quarter-wave or, in some cases, deeper subwavelength films, amplifying the intensity close to the surface wherein photogenerated minority charge carriers (holes) can reach the surface and oxidize water before recombination takes place. Combining this effect with photon retrapping schemes, such as using V-shaped cells, provides efficient light harvesting in ultrathin films of high internal quantum efficiency, overcoming the trade-off between light absorption and charge collection. A water photo-oxidation current density of 4 mA cm(-2) was achieved using a V-shaped cell comprising ∼ 26-nm-thick Ti-doped α-Fe(2)O(3) films on back-reflector substrates coated with silver-gold alloy.
Authors:
Hen Dotan; Ofer Kfir; Elad Sharlin; Oshri Blank; Moran Gross; Irina Dumchin; Guy Ankonina; Avner Rothschild
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-11
Journal Detail:
Title:  Nature materials     Volume:  -     ISSN:  1476-1122     ISO Abbreviation:  Nat Mater     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101155473     Medline TA:  Nat Mater     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Materials Science and Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel.
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