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Design principles for maximizing photovoltage in metal-oxide-protected water-splitting photoanodes.
Scheuermann, Andrew G; Lawrence, John P; Kemp, Kyle W; Ito, T; Walsh, Adrian; Chidsey, Christopher E D; Hurley, Paul K; McIntyre, Paul C.
Afiliación
  • Scheuermann AG; Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA.
  • Lawrence JP; Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA.
  • Kemp KW; Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA.
  • Ito T; Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA.
  • Walsh A; Tokyo Electron Limited, Technology Development Center, 650, Hosaka-cho Mitsuzawa, Nirasaki, Yamanashi 407-0192, Japan.
  • Chidsey CE; Tyndall National Institute, University College Cork, Cork, Ireland.
  • Hurley PK; Department of Chemistry, Stanford University, Stanford, California 94305, USA.
  • McIntyre PC; Tyndall National Institute, University College Cork, Cork, Ireland.
Nat Mater ; 15(1): 99-105, 2016 Jan.
Article en En | MEDLINE | ID: mdl-26480231
Metal oxide protection layers for photoanodes may enable the development of large-scale solar fuel and solar chemical synthesis, but the poor photovoltages often reported so far will severely limit their performance. Here we report a novel observation of photovoltage loss associated with a charge extraction barrier imposed by the protection layer, and, by eliminating it, achieve photovoltages as high as 630 mV, the maximum reported so far for water-splitting silicon photoanodes. The loss mechanism is systematically probed in metal-insulator-semiconductor Schottky junction cells compared to buried junction p(+)n cells, revealing the need to maintain a characteristic hole density at the semiconductor/insulator interface. A leaky-capacitor model related to the dielectric properties of the protective oxide explains this loss, achieving excellent agreement with the data. From these findings, we formulate design principles for simultaneous optimization of built-in field, interface quality, and hole extraction to maximize the photovoltage of oxide-protected water-splitting anodes.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Revista: Nat Mater Asunto de la revista: CIENCIA / QUIMICA Año: 2016 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Revista: Nat Mater Asunto de la revista: CIENCIA / QUIMICA Año: 2016 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido