@InProceedings{TanakaPaAbViViSt:2007:DeFiEl,
               author = "Tanaka, Roberto Yuji and Passaro, A. and Abe, N. M. and Vieira, G. 
                         S. and Villas-Boas, J. M. and Stephany, Stephan",
          affiliation = "{Instituto de Estudos Avan{\c{c}}ados (IEAv)} and {Instituto de 
                         Estudos Avan{\c{c}}ados (IEAv)} and {Instituto de Estudos 
                         Avan{\c{c}}ados (IEAv)} and {Instituto de Estudos 
                         Avan{\c{c}}ados (IEAv)} and {Instituto de Estudos 
                         Avan{\c{c}}ados (IEAv)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)}",
                title = "Development of finite element software tools for QWIP and QDIP 
                         design",
            booktitle = "Proceedings...",
                 year = "2007",
         organization = "Brazilian Workshop on Semiconductor Physics, 13.",
             abstract = "The first infrared sensor base on intersubband transitions was 
                         demonstrated in 1987 [1]. The quantum well infrared photodetector 
                         (QWIP) technology has enormously developed since then and today 
                         large focal plane arrays based on such technology is already 
                         available on the market [2,3]. The success of such technology is 
                         mainly due to its relative low cost, high pixel uniformity, 
                         selectivity and design flexibility. Infrared photodetectors based 
                         on intraband transitions in quantum dots (QDIPs) should, in 
                         principle, out-perform the ones using quantum wells (QWIPs), 
                         because of the possibility of absorbing normal incident light and 
                         operating at higher temperatures due to the electron longer 
                         lifetimes. Although the performance of QDIPs has improved 
                         considerably in the last few years, there is still much to be done 
                         before the QDIPs seriously compete with the QWIPs. The properties 
                         of both kinds of detectors are dependent on a fine adjust of both 
                         the material and the thickness of each layer that compound the 
                         detector structure. In this work, we present the development of 
                         computer codes that allow the evaluation of the electronic states 
                         in quantum dots and wells and respective oscillator strain for 
                         photon absorption. The codes are intended to help in the design of 
                         QWIPs and QDIPs, and they encompass two different methods to 
                         compute the quantum states, the expansion of the Hamiltonian in 
                         the basis of an infinite well much larger than the region under 
                         consideration (a large cylinder for QDIP or an one dimension box 
                         for QWIP) and a Finite Element Method. The codes are called by an 
                         user friendly graphic interface that allow the definition of the 
                         layer thicknesses, the materials composition (binary, ternary and 
                         quaternary alloys), and automatically compute the conduction band 
                         profile including the strain due to the lattice mismatch between 
                         different material when it is needed. The computer code also 
                         allows the definition of periodic structures easily. Results from 
                         three-dimensional codes intended for QDIP design will be presented 
                         and discussed.",
  conference-location = "S{\~a}o Paulo, SP",
      conference-year = "01-05 Apr.",
           targetfile = "tanaka_development.pdf",
        urlaccessdate = "27 jun. 2024"
}