<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2006000100007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Crecimiento de películas de CdTe:Al]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Alcudia]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zapata-Torres]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Meléndez-Lira]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Peña]]></surname>
<given-names><![CDATA[J.L.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,IPN CICATA ]]></institution>
<addr-line><![CDATA[Altamira Tamaulipas]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,IPN CINVESTAV Departamento de Física]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,IPN CINVESTAV Departamento de Física Aplicada]]></institution>
<addr-line><![CDATA[Merida Yuc]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2006</year>
</pub-date>
<volume>52</volume>
<numero>1</numero>
<fpage>48</fpage>
<lpage>52</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2006000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2006000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2006000100007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se crecieron películas del compuesto ternario CdTe:Al utilizando la tecnica transporte de vapor en espacio reducido combinado con evaporacion libre (CSVT-FE, por su siglas en inglés). La evaporación del aluminio (Al) se realizó a partir de dos tipos de fuente; una construida de grafito y la otra de tantalio. Las películas fueron crecidas sobre substratos de vidrio Corning. Con el objetivo de lograr diferentes concentraciones de aluminio se vario la temperatura de la fuente del Al, manteniendo fijas las temperaturas de la fuente de CdTe y la del substrato. Las películas fueron caracterizadas utilizando difraccion de rayos-X, análisis por dispersión de energía de rayos-X (EDAX, por su siglas en ingles) y transmisión óptica. Los resultados mostraron que en las películas crecidas con la fuente de grafito para la evaporacion del Al, éste no se incorporo en la matriz, al menos al nivel de sensibilidad de la técnica de cuantificación de EDAX; se mantuvo siempre la misma estructura cristalografica y el ancho de energía prohibida del CdTe. En las muestras crecidas con fuente de tantalio sí se logro incorporar el Al. Los patrones de difraccion de rayos-X mostraron que las películas exhibieron un tipo de estructura cristalina dependiente de la concentracion de aluminio. Las películas mantuvieron la fase cubica hasta una concentración de Al del 2.16% at; para 19.65% at de Al se obtuvo una combinacion de fases; para concentraciones mayores a 21 % at las películas fueron amorfas. Se estudiaron las muestras que mantuvieron una estructura cubica, encontrándose que el parámetro de red va disminuyendo y el ancho de banda de energía prohibida aumenta conforme se incrementa la concentracion de Al.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[CdTe:Al films were grown by the close space vapor transport technique combined with free evaporation (CSVT-FE). The Aluminum (Al) evaporation was made by two kinds of sources: one made of graphite and the other of tantalum. The films were deposited on glass substrates. The Al source temperatura was varied maintaining the CdTe source temperature fixed as well as the substrate temperature. The films were characterized by x-ray energy dispersive analysis (EDAX), x ray diffraction and optical transmission. The results showed for the films grown with the graphite source for Al evaporation, the Al did not incorporate in the CdTe matrix, at least to the level of EDAX sensitivity; they maintained the same crystal structure and band gap. For the samples grown with the tantalum source, we were able to incorporate the Al. The x ray diffraction patterns show that the films have a crystal structure that depends on Al concentration. They were cubic up to 2.16 at. % Al concentration; for 19.65 at. % we found a mixed phase; for Al concentration higher than 21 at. % the films were amorphous. For samples with cubic structure it was found that the lattice parameter decreasesand the band gap increases with Al concentration.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Películas de CdTe:Al]]></kwd>
<kwd lng="es"><![CDATA[estructura cristalina]]></kwd>
<kwd lng="en"><![CDATA[CdTe:Al films]]></kwd>
<kwd lng="en"><![CDATA[crystal structure]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Crecimiento de pel&iacute;culas de CdTe:Al</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>M. Gonz&aacute;lez&#150;Alcudia*, M. Zapata&#150;Torres*, M. Mel&eacute;ndez&#150;Lira**, J.L. Pe&ntilde;a***</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>* CICATA&#150;IPN, Altamira, Km. 14.5 carretera Tampico&#150;puerto Altamira, Altamira, 89600 Tamaulipas</i></font></p>     <p align="justify"><font face="verdana" size="2"><i>** Departamento de F&iacute;sica, CINVESTAV&#150;IPN, Apartado Postados 14&#150;740, 07000 M&eacute;xico, D.F.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i>*** </i><i>Departamento de F&iacute;sica Aplicada, CINVESTAV&#150;IPN, Unidad Merida, Apartado Postal 73 Cordemex, Merida Yuc., 97310, M&eacute;xico</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Recibido el 1 de agosto de 2005    <br> Aceptado el 23 de noviembre de 2005</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">Se crecieron pel&iacute;culas del compuesto ternario CdTe:Al utilizando la tecnica transporte de vapor en espacio reducido combinado con evaporacion libre (CSVT&#150;FE, por su siglas en ingl&eacute;s). La evaporaci&oacute;n del aluminio (Al) se realiz&oacute; a partir de dos tipos de fuente; una construida de grafito y la otra de tantalio. Las pel&iacute;culas fueron crecidas sobre substratos de vidrio Corning. Con el objetivo de lograr diferentes concentraciones de aluminio se vario la temperatura de la fuente del Al, manteniendo fijas las temperaturas de la fuente de CdTe y la del substrato. Las pel&iacute;culas fueron caracterizadas utilizando difraccion de rayos&#150;X, an&aacute;lisis por dispersi&oacute;n de energ&iacute;a de rayos&#150;X (EDAX, por su siglas en ingles) y transmisi&oacute;n &oacute;ptica. Los resultados mostraron que en las pel&iacute;culas crecidas con la fuente de grafito para la evaporacion del Al, &eacute;ste no se incorporo en la matriz, al menos al nivel de sensibilidad de la t&eacute;cnica de cuantificaci&oacute;n de EDAX; se mantuvo siempre la misma estructura cristalografica y el ancho de energ&iacute;a prohibida del CdTe. En las muestras crecidas con fuente de tantalio s&iacute; se logro incorporar el Al. Los patrones de difraccion de rayos&#150;X mostraron que las pel&iacute;culas exhibieron un tipo de estructura cristalina dependiente de la concentracion de aluminio. Las pel&iacute;culas mantuvieron la fase cubica hasta una concentraci&oacute;n de Al del 2.16% at; para 19.65% at de Al se obtuvo una combinacion de fases; para concentraciones mayores a 21 % at las pel&iacute;culas fueron amorfas. Se estudiaron las muestras que mantuvieron una estructura cubica, encontr&aacute;ndose que el par&aacute;metro de red va disminuyendo y el ancho de banda de energ&iacute;a prohibida aumenta conforme se incrementa la concentracion de Al.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Pel&iacute;culas de CdTe:Al; estructura cristalina.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">CdTe:Al films were grown by the close space vapor transport technique combined with free evaporation (CSVT&#150;FE). The Aluminum (Al) evaporation was made by two kinds of sources: one made of graphite and the other of tantalum. The films were deposited on glass substrates. The Al source temperatura was varied maintaining the CdTe source temperature fixed as well as the substrate temperature. The films were characterized by x&#150;ray energy dispersive analysis (EDAX), x ray diffraction and optical transmission. The results showed for the films grown with the graphite source for Al evaporation, the Al did not incorporate in the CdTe matrix, at least to the level of EDAX sensitivity; they maintained the same crystal structure and band gap. For the samples grown with the tantalum source, we were able to incorporate the Al. The x ray diffraction patterns show that the films have a crystal structure that depends on Al concentration. They were cubic up to 2.16 at. % Al concentration; for 19.65 at. % we found a mixed phase; for Al concentration higher than 21 at. % the films were amorphous. For samples with cubic structure it was found that the lattice parameter decreasesand the band gap increases with Al concentration.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>CdTe:Al films; crystal structure.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 73.61.Ga; 78.40Fy, 61.66.Dk</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v52n1/v52n1a7.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Agradecimientos</b></font></p>     <p align="justify"><font face="verdana" size="2">Agradecemos a Marcela Guerrero y Javier Zapata por su asistencia tecnica. Este proyecto fue financiado por CGPI&#150;IPN y CONACYT, bajo los proyectos 20040379 y 38444E.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. V.M. Koshkin y Y.N. Dmitriev, <i>Chemistry Reviews </i><b>19</b> (1994) 1.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8316489&pid=S0035-001X200600010000700001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">2. I.N. Volovichev, Y.G. Gurevich y V.M. 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