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Proceedings Paper

Synchrotron-based spectroscopy for solar energy conversion
Author(s): F. J. Himpsel; P. L. Cook; I. Zegkinoglou; Idris Boukahil; R. Qiao; W. Yang; S. C. Pemmaraju; D. Prendergast; C. X. Kronawitter; M. G. Kibria; Zetian Mi; L. Vayssieres
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Paper Abstract

X-rays from synchrotron radiation enable incisive spectroscopic techniques which speed up the discovery of new materials for photovoltaics and photoelectrochemistry. A particularly useful method is X-ray absorption spectroscopy (XAS), which probes empty electronic states. XAS is element- and bond-specific, with the additional capability of determining the bond orientation. Close feedback from density functional calculations makes it possible to discover and exploit systematic trends in the electronic properties. Case studies are presented, such as solar cells that combine an absorber with an electron donor and an acceptor in one molecular complex and nanowire arrays serving as photoanodes for water splitting. In addition to the energy levels the lifetimes of the charge carriers play an essential role in device performance. A new generation of laser-like X-ray sources will make it possible to follow the fate of excited charge carriers traveling across a molecular complex or through a device structure in real time.

Paper Details

Date Published: 5 September 2015
PDF: 7 pages
Proc. SPIE 9560, Solar Hydrogen and Nanotechnology X, 95600G (5 September 2015); doi: 10.1117/12.2187038
Show Author Affiliations
F. J. Himpsel, Univ. of Wisconsin-Madison (United States)
P. L. Cook, Univ. of Wisconsin-Superior (United States)
I. Zegkinoglou, Univ. of Wisconsin-Madison (United States)
Idris Boukahil, Univ. of Wisconsin-Madison (United States)
R. Qiao, Lawrence Berkeley National Lab. (United States)
W. Yang, Lawrence Berkeley National Lab. (United States)
S. C. Pemmaraju, Lawrence Berkeley National Lab. (United States)
D. Prendergast, Lawrence Berkeley National Lab. (United States)
C. X. Kronawitter, Princeton Univ. (United States)
M. G. Kibria, McGill Univ. (Canada)
Zetian Mi, McGill Univ. (Canada)
L. Vayssieres, Xian Jiaotong Univ. (China)

Published in SPIE Proceedings Vol. 9560:
Solar Hydrogen and Nanotechnology X
Shaohua Shen, Editor(s)

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