### HgCdTe molecular beam epitaxy material for microcavity light emitters: Application to gas detection in the 2–6 µm rangeHgCdTe molecular beam epitaxy material for microcavity light emitters: Application to gas detection in the 2–6 µm range

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 Author Zanatta, J. P. ♦ ël, F. ♦ Ballet, P. ♦ Hdadach, N. ♦ Million, A. ♦ Destefanis, G. ♦ Mottin, E. ♦ Kopp, C. ♦ Picard, E. ♦ Hadji, E. Source SpringerLink Content type Text Publisher Springer-Verlag File Format PDF Copyright Year ©2003 Language English
 Subject Domain (in DDC) Natural sciences & mathematics ♦ Chemistry & allied sciences Subject Keyword HgCdTe ♦ molecular beam epitaxy (MBE) ♦ light emitters ♦ Optical and Electronic Materials ♦ Characterization and Evaluation of Materials ♦ Electronics and Microelectronics, Instrumentation ♦ Solid State Physics and Spectroscopy Abstract Most pollution gases, CO, CO$_{2}$, NO$_{x}$, SO$_{2}$, CH$_{4}$ …, have fundamental optical absorption in the near infrared range. We report here on microcavity light sources emitting at room temperature between 2 and 6 µm integrated in a gas detection system. HgCdTe has been chosen for this application, among several semiconductor materials. Molecular beam epitaxy (MBE) is very well adapted to grow the suitable HgCdTe heterostructure. The quality of involved HgCdTe layers has to be optimized in order to have a good photoluminescence response at 300 K. For this study, we used the knowledge we acquired in the field of MBE HgCdTe growth for infrared focal plane arrays (IRFPAs). Especially, we took advantage of the substrate preparation before growing and the flux control. We show subsequently several characterization results concerning our material quality. The compact emitting system is formed by this microcavity structure coupled to a 0.8-µm external pumping source. The Fabry-Perot type microcavity is obtained by using two evaporated YF$_{3}$/ZnS dielectric multilayered Bragg mirrors. We developed several devices exhibiting emission wavelengths at 3.3 µm, 4.26 µm, and 4.7 µm for CH$_{4}$, CO$_{2}$, and CO gas measurements, respectively, and 3.7 µm for the reference beam. We measured less than 200 ppm CH$_{4}$ in a 1 bar mixed gas along a 10-cm-long cell. ISSN 03615235 Age Range 18 to 22 years ♦ above 22 year Educational Use Research Education Level UG and PG Learning Resource Type Article Publisher Date 2003-01-01 Publisher Place New York e-ISSN 1543186X Journal Journal of Electronic Materials Volume Number 32 Issue Number 7 Page Count 6 Starting Page 602 Ending Page 607