Research Papers

Effect of effective mass mismatch in CdS/CdTe heterojunctions on the fundamental design parameters of nanophotonic devices

[+] Author Affiliations
José R. Villa-Angulo

Autonomous University of Baja California, Institute of Engineering, s/n De la Normal Avenue, Insurgentes, Mexicali, B.C. 21280, Mexico

Rafael Villa-Angulo

Autonomous University of Baja California, Institute of Engineering, s/n De la Normal Avenue, Insurgentes, Mexicali, B.C. 21280, Mexico

Karina Solorio-Ferrales

Autonomous University of Baja California, Institute of Engineering, s/n De la Normal Avenue, Insurgentes, Mexicali, B.C. 21280, Mexico

Silvia E. Ahumada-Valdez

Autonomous University of Baja California, Institute of Engineering, s/n De la Normal Avenue, Insurgentes, Mexicali, B.C. 21280, Mexico

Carlos Villa-Angulo

Autonomous University of Baja California, Institute of Engineering, s/n De la Normal Avenue, Insurgentes, Mexicali, B.C. 21280, Mexico

J. Nanophoton. 8(1), 083096 (Jan 20, 2014). doi:10.1117/1.JNP.8.083096
History: Received September 24, 2013; Revised December 11, 2013; Accepted December 16, 2013
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Abstract.  Single- and multiple-quantum well (QW) nanophotonic devices, such as detectors and solar cells, are often fabricated by the concatenation of low-dimensional heterojunctions of different semiconductors. Quantum effects dominate the well structure, with dimensions of the order of several nanometers. At this width regime, even small variations in the fundamental material properties, such as band gap, dielectric constant, lattice constant, and effective mass of the materials, may give rise to errors in determining the fundamental design parameters. This, in turn, can significantly affect the device performance. In cadmium-sulfide/cadmium-telluride (CdS/CdTe) material system, the failure to include the mismatch of electronic effective masses can lead to >30% shift from the real position of the eigenstate energy levels, and >40% shift from the real position of quasi-Fermi levels EFn and EFp. In addition, depending on the width of the QW active layer, the absorption coefficient value can lead to >12% shift from its real value. These results prompt the need for accurate estimation of such errors in the precise analysis and design of CdS/CdTe heterojunction-based nanophotonic devices.

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© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

José R. Villa-Angulo ; Rafael Villa-Angulo ; Karina Solorio-Ferrales ; Silvia E. Ahumada-Valdez and Carlos Villa-Angulo
"Effect of effective mass mismatch in CdS/CdTe heterojunctions on the fundamental design parameters of nanophotonic devices", J. Nanophoton. 8(1), 083096 (Jan 20, 2014). ; http://dx.doi.org/10.1117/1.JNP.8.083096


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