Silicon Microwire Arrays for Solar Energy-Conversion Applications

Warren, Emily L.; Atwater, Harry A.; Lewis, Nathan S.

doi:10.1021/jp406280x

Title: Silicon Microwire Arrays for Solar Energy-Conversion Applications

Journal Article · Mon Dec 09 00:00:00 EST 2013 · Journal of Physical Chemistry. C

DOI:https://doi.org/10.1021/jp406280x· OSTI ID:1634125

Warren, Emily L. ^[1]; Atwater, Harry A. ^[1]; Lewis, Nathan S. ^[1]

California Institute of Technology (CalTech), Pasadena, CA (United States)

Highly structured silicon microwire (Si MW) arrays have been synthesized and characterized as absorbers for solar energy-conversion systems. These materials are of great interest for applications in solar energy conversion, including solar electricity and solar fuels production, due to their unique materials properties, form factors, ease of fabrication, and device processing attributes. The Si MW array geometry allows for efficient collection of photogenerated carriers from impure materials that have short minority-carrier diffusion lengths, while simultaneously allowing for high optical absorption and high external quantum yields for charge carrier collection. In addition, Si MW arrays exhibit unique mesoscale optical behavior and can be removed from the growth substrate to provide flexible, processable arrays of Si microwires ordered in a variety of organic polymers and ionomers. The unique photon management properties of Si MW arrays, combined with their high internal surface area and controlled morphology for catalyst placement and support, allow for the use of earth-abundant electrocatalysts to produce an integrated, functional photoelectrode. Furthermore, these materials therefore also provide an opportunity to explore the 3-dimensional photoelectrochemical behavior of fuel-forming microstructured electrodes.

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Research Organization:: California Institute of Technology (CalTech), Pasadena, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0004993; FG02-03-ER15483

OSTI ID:: 1634125

Journal Information:: Journal of Physical Chemistry. C, Vol. 118, Issue 2; ISSN 1932-7447

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 70 works

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