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Diamond Photodiodes for X-ray Applications

Published online by Cambridge University Press:  31 January 2011

John Smedley
Affiliation:
smedley@bnl.gov, Brookhaven National Laboratory, Instrumentation, Upton, New York, United States
Jeffrey W. Keister
Affiliation:
jkeister@bnl.gov, Brookhaven National Laboratory, NSLS-II, Upton, New York, United States
Erik M. Muller
Affiliation:
emuller@bnl.gov, Stony Brook University, Stony Brook, New York, United States
Jean Jordan-Sweet
Affiliation:
jlj@bnl.gov, IBM, T.J. Watson Research Center, Yorktown Heights, New York, United States
Jen Bohon
Affiliation:
jbohon@bnl.gov, Case Western Reserve University, Center for Synchrotron Biosciences, Upton, New York, United States
James Distel
Affiliation:
jdistel@lanl.gov, Los Alamos National Laboratory, Los Alamos, New Mexico, United States
Bin Dong
Affiliation:
bdong01@bnl.gov, Global Strategies Group, North America, Crofton, Maryland, United States
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Abstract

Single crystal high purity CVD diamonds have been metallized and calibrated as photodiodes at the National Synchrotron Light Source (NSLS). Current mode responsivity measurements have been made over a wide range (0.2-28 keV) of photon energies across several beamlines. Linear response has been achieved over ten orders of magnitude of incident flux, along with uniform spatial response. A simple model of responsivity has been used to describe the results, yielding a value of 13.3±0.5 eV for the mean pair creation energy. The responsivity vs. photon energy data show a dip for photon energies near the carbon edge (284 eV), indicating incomplete charge collection for carriers created less than one micron from the metallized layer.

Type
Research Article
Copyright
Copyright © Materials Research Society 2010

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References

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