Cogan, George W. and Gronet, Chris M. and Gibbons, James F. and Lewis, Nathan S. (1984) 7.2% efficient polycrystalline silicon photoelectrode. Applied Physics Letters, 44 (5). pp. 539-541. ISSN 0003-6951 http://resolver.caltech.edu/CaltechAUTHORS:COGapl84
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After etching, n-type cast polycrystalline silicon photoanodes immersed in a solution of methanol and a substituted ferrocene reagent exhibit photoelectrode efficiencies of 7.2%±0.7% under simulated AM2 illumination. Scanning laser spot data indicate that the grain boundaries are active; however, the semiconductor/liquid contact does not display the severe shunting effects which are observed at a polycrystalline Si/Pt Schottky barrier. Evidence for an interfacial oxide on the operating polycrystalline Si photoanode is presented. Some losses in short circuit current can be ascribed to bulk semiconductor properties; however, despite these losses, photoanodes fabricated from polycrystalline substrates exhibit efficiencies comparable to those of single crystal material. Two major conclusions of our studies are that improved photoelectrode behavior in the polycrystalline silicon/methanol system will primarily result from changes in bulk electrode properties and from grain boundary passivation, and that Fermi level pinning by surface states does not prevent the design of efficient silicon-based liquid junctions.
|Additional Information:||Copyright © 1984 American Institute of Physics. Received 22 July 1983; accepted 19 December 1983.|
|Subject Keywords:||polycrystals, etching, photoanodes, photocathodes, silicon, fabrication, efficiency, interfaces, grain boundaries, passivation, Fermi level, Schottky barrier diodes, platinum, photoelectric effect, electric conductivity, pinning, surface states|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Archive Administrator|
|Deposited On:||04 Jun 2008|
|Last Modified:||26 Dec 2012 10:04|
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