Mapping Local Charge Recombination Heterogeneity by Multidimensional Nanospectroscopic Imaging

Year: 2012

Authors: Bao W., Melli M., Caselli N., Riboli F., Wiersma D., Staffaroni M., Choo H., Ogletree DF., Aloni S., Bokor J., Cabrini S., Intonti F., Salmeron MB., Yablonovitch E., Schuck PJ., Weber-Bargioni A.

Autors Affiliation: Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Mol Foundry, Berkeley, CA 94720 USA; Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA; European Lab Nonlinear Spect, I-50019 Florence, Italy; Univ Florence, Dipartimento Fis & Astron, I-50019 Florence, Italy; CNR, Ist Nazl Ott, I-50125 Florence, Italy; Univ Calif Berkeley, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA; CALTECH, Dept Elect Engn, Pasadena, CA 91125 USA

Abstract: As materials functionality becomes more dependent on local physical and electronic properties, the importance of optically probing matter with true nanoscale spatial resolution has increased. In this work, we mapped the influence of local trap states within individual nanowires on carrier recombination with deeply subwavelength resolution. This is achieved using multidimensional nanospectroscopic imaging based on a nano-optical device. Placed at the end of a scan probe, the device delivers optimal near-field properties, including highly efficient far-field to near-field coupling, ultralarge field enhancement, nearly background-free imaging, independence from sample requirements, and broadband operation. We performed similar to 40-nanometer-resolution hyperspectral imaging of indium phosphide nanowires via excitation and collection through the probes, revealing optoelectronic structure along individual nanowires that is not accessible with other methods.

Journal/Review: SCIENCE

Volume: 338 (6112)      Pages from: 1317  to: 1321

More Information: The authors specifically thank E. Wong for fast and high-quality technical support, as well as our colleagues at the Molecular Foundry for stimulating discussion and assistance. We thank O. Yaghi, D. Milliron, M. Crommie, J. DeYoreo, and Y. D. Suh for valuable advice, discussions and reading of the manuscript. A provisional patent application regarding the fabrication of campanile-like structures on scan probes has been filed. Work at the Molecular Foundry was supported by the U.S. Department of Energy (DOE), Office of Basic Energy Sciences, Scientific User Facilities Division, under contract no. DE-AC02-05CH11231. Campanile tips were prepared by M. Melli, who was supported by the DOE, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, under contract no. DE-AC02-05CH11231.
DOI: 10.1126/science.1227977

Citations: 127
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