The design, fabrication, and characterization of heterojunction photodiodes for room temperature operation in the mid-infrared (3–5 µm) spectral range is described. Devices appropriate for carbon dioxide detection have been developed and studied. The authors report on the improvements obtained by increasing buffer layer thickness and also by using a blocking barrier to reduce leakage current
Copyright 2006 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Applied Physics Letters, 89 (8), 2006 and may be found at http://link.aip.org/link/?APPLAB/89/083512/1