<?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>S0035-001X2011000300008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estructura y morfología de películas de pm-Si:H crecidas por PECVD variando la dilución de diclorosilano con hidrógeno y la presión de trabajo]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Álvarez-Macías]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santoyo-Salazar]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Monroy]]></surname>
<given-names><![CDATA[B.M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Sánchez]]></surname>
<given-names><![CDATA[M.F.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Picquart]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ponce]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Contreras-Puente]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<xref ref-type="aff" rid="A05"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santana]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Investigaciones en Materiales ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Politécnico Nacional Centro de Investigación y de Estudios Avanzados Departamento de Física]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>México</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad Autónoma Metropolitana Iztapalapa Departamento de Física ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>México</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Physics & Astronomy University of Texas Kleberg Advanced Electron Microscopy Center Department ]]></institution>
<addr-line><![CDATA[San Antonio TX]]></addr-line>
</aff>
<aff id="A05">
<institution><![CDATA[,Instituto Politécnico Nacional Escuela Superior de Física y Matemáticas ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2011</year>
</pub-date>
<volume>57</volume>
<numero>3</numero>
<fpage>224</fpage>
<lpage>231</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2011000300008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2011000300008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2011000300008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El silicio polimorfo hidrogenado (pm-Si:H) es un material atractivo para la industria fotovoltaica al tener propiedades optoelectrónicas similares al silicio amorfo hidrogenado (a-Si:H), actualmente utilizado, y mejor estabilidad ante exposición prolongada a la radiación solar. En este trabajo se reportan los resultados experimentales de caracterizaciones estructurales y morfológicas de películas de pm-Si:H crecidas con diferentes condiciones de depósito en términos de tamaño de grano y fracción cristalina, obtenidos por espectroscopía Raman, y el análisis de la rugosidad superficial por microscopía de fuerza atómica. Las películas fueron obtenidas con la tecnica PECVD bajo condiciones de generación de nanocristales de silicio embebidos en una matriz de silicio amorfo. El análisis estructural confirma que el tamaño y la densidad de los nanocristales es sensible tanto a cambios en la presión de la cámara del reactor (250 y 500 mTorr) como a variaciones en la dilución del gas precursor de silicio (SiH2Cl2) en hidrógeno (H2) (tazas de flujo de 25, 50, 75 y 100 sccm). El análisis morfológico mostré) que para 25 sccm de H2 hay una diferencia de rugosidad RMS de 8 nm entre ambas presiones, mientras que para los demás flujos de H2 se obtuvo la misma rugosidad RMS (entre 2 y 3 nm). Los resultados muestran que mientras el tamaño y la densidad de los nanocristales se modifican considerablemente con las condiciones de depósito, la rugosidad no se modifica considerablemente a diluciones de diclorosilano mayores a 25 sccm, lo que permite obtener materiales diferentes con interfaces de buena calidad para la aplicación del material en dispositivos fotovoltaicos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Hydrogenated polymorphous silicon (pm-Si:H) is an attractive material for applications in the photovoltaic industry as it has optoelectronic properties similar to amorphous silicon (a-Si:H), which is the material currently used, and better stability to prolonged exposure to solar radiation. In this work we report experimental results of structural and morphological characterization of pm-Si:H films in terms of grain size and crystalline fraction obtained by Raman spectroscopy studies and the analysis of surface roughness with atomic force microscopy. The films were obtained by PECVD under conditions of generation of nano-crystalline silicon inclusions embedded in an amorphous silicon matrix. Changes in pressure of the reactor chamber (250 and 500 mTorr) and variations in the dilution of the silicon precursor gas (SiH2Cl2) with hydrogen (H2) (flow rates of 25, 50, 75 and 100 sccm) modified the nanocrystals size and the crystalline fraction. The morphological analysis showed that for 25 sccm of H2 there is a difference of 8 nm in the RMS roughness between both pressures, while for the other flows of H2 the same RMS roughness (2 to 3 nm) was obtained. These results are very important because the optoelectronic properties of materials depend on the size and density of nanocrystals and the roughness analysis helps determine the growth conditions to produce high quality interfaces for application of the material in photovoltaic devices.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Silicio polimorfo hidrogenado]]></kwd>
<kwd lng="es"><![CDATA[nanocristales]]></kwd>
<kwd lng="es"><![CDATA[AFM]]></kwd>
<kwd lng="es"><![CDATA[Raman]]></kwd>
<kwd lng="en"><![CDATA[Hydrogenated polymorphous silicon]]></kwd>
<kwd lng="en"><![CDATA[nanocrystals]]></kwd>
<kwd lng="en"><![CDATA[AFM]]></kwd>
<kwd lng="en"><![CDATA[Raman]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p> 	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="center"><font face="verdana" size="4"><b>Estructura y morfolog&iacute;a de pel&iacute;culas de pm&#150;Si:H crecidas por PECVD variando la diluci&oacute;n de diclorosilano con hidr&oacute;geno y la presi&oacute;n de trabajo</b></font></p> 	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="center"><font face="verdana" size="2"><b>C. &Aacute;lvarez&#150;Mac&iacute;as&ordf;, J. Santoyo&#150;Salazar<sup>b</sup>, B.M. Monroy&ordf;, M.F. Garc&iacute;a&#150;S&aacute;nchez&ordf;, M. Picquart<sup>c</sup>, A. Ponce<sup>d</sup>, G. Contreras&#150;Puente<sup>e</sup> y G. Santana<sup>a,b,*</sup></b></font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2"><i>&ordf; Instituto de Investigaciones en Materiales, Universidad Nacional Aut&oacute;noma de M&eacute;xico, Av. Universidad No. 3000, Col. Ciudad Universitaria, Apartado Postal 70&#150;360, Coyoac&aacute;n, M&eacute;xico, D.F., 04510, M&eacute;xico, e&#150;mail:</i> <a href="mailto:gsantana@iim.unam.mx">gsantana@iim.unam.mx</a>.</font></p> 	    <p align="justify"><font face="verdana" size="2"><i><sup>b</sup> Departamento de F&iacute;sica, Centro de Investigaci&oacute;n y de Estudios Avanzados del Instituto Polit&eacute;cnico Nacional, </i><i>Apartado Postal 14&#150;740, M&eacute;xico, D.F. 07000, M&eacute;xico.</i></font></p> 	    <p align="justify"><font face="verdana" size="2"><i><sup>c</sup> Departamento de F&iacute;sica, Universidad Aut&oacute;noma Metropolitana Iztapalapa, Apartado Postal 55&#150;534, M&eacute;xico, D.F. 09340, M&eacute;xico.</i></font></p> 	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i><sup>d </sup>Kleberg Advanced Electron Microscopy Center Department Physics &amp; Astronomy University of Texas at San Antonio One UTSA, San Antonio, TX. 78249.</i></font></p> 	    <p align="justify"><font face="verdana" size="2"><i><sup>e </sup>Escuela Superior de F&iacute;sica y Matem&aacute;ticas del Instituto Polit&eacute;cnico Nacional, Edif. 9, UPALM, Col. Lindavista, 07738.</i></font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2">Recibido el 20 de enero de 2011    <br>     Aceptado el 1 de abril de 2011</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">El silicio polimorfo hidrogenado (pm&#150;Si:H) es un material atractivo para la industria fotovoltaica al tener propiedades optoelectr&oacute;nicas similares al silicio amorfo hidrogenado (a&#150;Si:H), actualmente utilizado, y mejor estabilidad ante exposici&oacute;n prolongada a la radiaci&oacute;n solar. En este trabajo se reportan los resultados experimentales de caracterizaciones estructurales y morfol&oacute;gicas de pel&iacute;culas de pm&#150;Si:H crecidas con diferentes condiciones de dep&oacute;sito en t&eacute;rminos de tama&ntilde;o de grano y fracci&oacute;n cristalina, obtenidos por espectroscop&iacute;a Raman, y el an&aacute;lisis de la rugosidad superficial por microscop&iacute;a de fuerza at&oacute;mica. Las pel&iacute;culas fueron obtenidas con la tecnica PECVD bajo condiciones de generaci&oacute;n de nanocristales de silicio embebidos en una matriz de silicio amorfo. El an&aacute;lisis estructural confirma que el tama&ntilde;o y la densidad de los nanocristales es sensible tanto a cambios en la presi&oacute;n de la c&aacute;mara del reactor (250 y 500 mTorr) como a variaciones en la diluci&oacute;n del gas precursor de silicio (SiH<sub>2</sub>Cl<sub>2</sub>) en hidr&oacute;geno (H<sub>2</sub>) (tazas de flujo de 25, 50, 75 y 100 sccm). El an&aacute;lisis morfol&oacute;gico mostr&eacute;) que para 25 sccm de H<sub>2</sub> hay una diferencia de rugosidad RMS de 8 nm entre ambas presiones, mientras que para los dem&aacute;s flujos de H<sub>2</sub> se obtuvo la misma rugosidad RMS (entre 2 y 3 nm). Los resultados muestran que mientras el tama&ntilde;o y la densidad de los nanocristales se modifican considerablemente con las condiciones de dep&oacute;sito, la rugosidad no se modifica considerablemente a diluciones de diclorosilano mayores a 25 sccm, lo que permite obtener materiales diferentes con interfaces de buena calidad para la aplicaci&oacute;n del material en dispositivos fotovoltaicos.</font></p> 	    <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Silicio polimorfo hidrogenado; nanocristales; AFM; Raman.</font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p> 	    <p align="justify"><font face="verdana" size="2">Hydrogenated polymorphous silicon (pm&#150;Si:H) is an attractive material for applications in the photovoltaic industry as it has optoelectronic properties similar to amorphous silicon (a&#150;Si:H), which is the material currently used, and better stability to prolonged exposure to solar radiation. In this work we report experimental results of structural and morphological characterization of pm&#150;Si:H films in terms of grain size and crystalline fraction obtained by Raman spectroscopy studies and the analysis of surface roughness with atomic force microscopy. The films were obtained by PECVD under conditions of generation of nano&#150;crystalline silicon inclusions embedded in an amorphous silicon matrix. Changes in pressure of the reactor chamber (250 and 500 mTorr) and variations in the dilution of the silicon precursor gas (SiH<sub>2</sub>Cl<sub>2</sub>) with hydrogen (H<sub>2</sub>) (flow rates of 25, 50, 75 and 100 sccm) modified the nanocrystals size and the crystalline fraction. The morphological analysis showed that for 25 sccm of H<sub>2</sub> there is a difference of 8 nm in the RMS roughness between both pressures, while for the other flows of H<sub>2</sub> the same RMS roughness (2 to 3 nm) was obtained. These results are very important because the optoelectronic properties of materials depend on the size and density of nanocrystals and the roughness analysis helps determine the growth conditions to produce high quality interfaces for application of the material in photovoltaic devices.</font></p> 	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Hydrogenated polymorphous silicon; nanocrystals; AFM; Raman.</font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2">PACS: 68.35.Ct; 68.37.Ps; 73.61.Jc; 78.67.Bf; 81.07.Bc; 81.15.Gh</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/v57n3/v57n3a8.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 el apoyo financiero parcial de esta obra a DGAPA&#150;UNAM PAPIIT: Proyectos IN116409&#150;2 y IN115909&#150;2, a CONACyT M&eacute;xico con el proyecto 48970 y al ICyTDF con el proyecto PIFUTP08&#150;143. Los autores agradecen al Dr. JC Alonso y el Dr. A. Ortiz por el uso de laboratorio durante la preparaci&oacute;n de muestras y al Dr. A. Remolina Millan por su contribuci&oacute;n en la preparaci&oacute;n de las muestras. C. &Aacute;lvarez y M. F. Garc&iacute;a agradecen los apoyos financieros por CONACyT a trav&eacute;s de la beca doctoral CVU 165872 y de la beca posdoctoral ICyTDF, respectivamente.</font></p> 	    ]]></body>
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