{"id":5232,"date":"2012-10-16T08:50:24","date_gmt":"2012-10-16T06:50:24","guid":{"rendered":"https:\/\/decker-anlagenbau.de\/recycling-of-rejects\/"},"modified":"2026-04-27T15:12:33","modified_gmt":"2026-04-27T13:12:33","slug":"recycling-of-rejects","status":"publish","type":"post","link":"https:\/\/decker-anlagenbau.de\/en\/recycling-of-rejects\/","title":{"rendered":"Recycling of Rejects"},"content":{"rendered":"<p><\/p><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-padding-right:700px;--awb-padding-left:200px;--awb-padding-right-medium:50px;--awb-padding-left-medium:50px;--awb-padding-right-small:0px;--awb-padding-left-small:0px;--awb-margin-top:120px;--awb-margin-top-medium:50px;--awb-margin-top-small:50px;--awb-flex-wrap:wrap;\"><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:104%;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-padding-right-small:30px;--awb-padding-left-small:30px;--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:0.96%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:0.96%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:0.96%;--awb-spacing-left-medium:0.96%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:2.4%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-title title fusion-title-1 fusion-sep-none fusion-title-text fusion-title-size-one\"><h1 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;\">Recycling of Rejects<span style=\"color: var(--awb-color5);\">.<\/span><\/h1><\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-2 fusion-flex-container has-pattern-background has-mask-background hundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-padding-right:200px;--awb-padding-left:0px;--awb-padding-right-medium:30px;--awb-padding-right-small:0px;--awb-padding-left-small:0px;--awb-margin-top:75px;--awb-margin-bottom:125px;--awb-margin-top-small:0px;--awb-margin-bottom-small:100px;--awb-flex-wrap:wrap;\"><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"width:104% !important;max-width:104% !important;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-1 awb-sticky awb-sticky-medium awb-sticky-large fusion_builder_column_1_2 1_2 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:50%;--awb-margin-top-large:0px;--awb-spacing-right-large:0%;--awb-margin-bottom-large:0px;--awb-spacing-left-large:0%;--awb-width-medium:50%;--awb-order-medium:0;--awb-spacing-right-medium:0%;--awb-spacing-left-medium:0%;--awb-width-small:100%;--awb-order-small:4;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;--awb-sticky-offset:50px;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-image-element \" style=\"--awb-margin-bottom:15px;--awb-margin-right-small:15px;--awb-margin-left-small:15px;--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><span class=\" fusion-imageframe imageframe-none imageframe-1 hover-type-none\"><img decoding=\"async\" width=\"1500\" height=\"1000\" alt=\"Process for cleaning silicon with popcorn-like surfaces and structures\" title=\"System for silicon purification\" src=\"https:\/\/decker-anlagenbau.de\/wp-content\/uploads\/sites\/2\/2025\/08\/2012_DECKER_Recycling-Rejects_1500x1000_1.jpg\" class=\"img-responsive wp-image-5233\" srcset=\"https:\/\/decker-anlagenbau.de\/wp-content\/uploads\/sites\/6\/2025\/08\/2012_DECKER_Recycling-Rejects_1500x1000_1-200x133.jpg 200w, https:\/\/decker-anlagenbau.de\/wp-content\/uploads\/sites\/6\/2025\/08\/2012_DECKER_Recycling-Rejects_1500x1000_1-400x267.jpg 400w, https:\/\/decker-anlagenbau.de\/wp-content\/uploads\/sites\/6\/2025\/08\/2012_DECKER_Recycling-Rejects_1500x1000_1-600x400.jpg 600w, https:\/\/decker-anlagenbau.de\/wp-content\/uploads\/sites\/6\/2025\/08\/2012_DECKER_Recycling-Rejects_1500x1000_1-800x533.jpg 800w, https:\/\/decker-anlagenbau.de\/wp-content\/uploads\/sites\/6\/2025\/08\/2012_DECKER_Recycling-Rejects_1500x1000_1-1200x800.jpg 1200w, https:\/\/decker-anlagenbau.de\/wp-content\/uploads\/sites\/6\/2025\/08\/2012_DECKER_Recycling-Rejects_1500x1000_1.jpg 1500w\" sizes=\"(max-width: 640px) 100vw, (max-width: 1919px) 1200px,(min-width: 1920px) 50vw\"><\/span><\/div><div class=\"fusion-image-element \" style=\"--awb-margin-bottom:15px;--awb-margin-right-small:15px;--awb-margin-left-small:15px;--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><span class=\" fusion-imageframe imageframe-none imageframe-2 hover-type-none\"><img decoding=\"async\" width=\"1500\" height=\"1000\" alt=\"Process for cleaning silicon with popcorn-like surfaces and structures\" title=\"System for silicon purification\" src=\"https:\/\/decker-anlagenbau.de\/wp-content\/uploads\/sites\/2\/2025\/08\/2012_DECKER_Recycling-Rejects_1500x1000_2.jpg\" class=\"img-responsive wp-image-5234\" srcset=\"https:\/\/decker-anlagenbau.de\/wp-content\/uploads\/sites\/6\/2025\/08\/2012_DECKER_Recycling-Rejects_1500x1000_2-200x133.jpg 200w, https:\/\/decker-anlagenbau.de\/wp-content\/uploads\/sites\/6\/2025\/08\/2012_DECKER_Recycling-Rejects_1500x1000_2-400x267.jpg 400w, https:\/\/decker-anlagenbau.de\/wp-content\/uploads\/sites\/6\/2025\/08\/2012_DECKER_Recycling-Rejects_1500x1000_2-600x400.jpg 600w, https:\/\/decker-anlagenbau.de\/wp-content\/uploads\/sites\/6\/2025\/08\/2012_DECKER_Recycling-Rejects_1500x1000_2-800x533.jpg 800w, https:\/\/decker-anlagenbau.de\/wp-content\/uploads\/sites\/6\/2025\/08\/2012_DECKER_Recycling-Rejects_1500x1000_2-1200x800.jpg 1200w, https:\/\/decker-anlagenbau.de\/wp-content\/uploads\/sites\/6\/2025\/08\/2012_DECKER_Recycling-Rejects_1500x1000_2.jpg 1500w\" sizes=\"(max-width: 640px) 100vw, (max-width: 1919px) 1200px,(min-width: 1920px) 50vw\"><\/span><\/div><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-2 fusion-flex-column sticky-text\" style=\"--awb-padding-top-small:0px;--awb-padding-right-small:30px;--awb-padding-left-small:30px;--awb-bg-color-small:var(--awb-color1);--awb-bg-size:cover;--awb-width-large:50%;--awb-margin-top-large:0px;--awb-spacing-right-large:3.84%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:19.2%;--awb-width-medium:50%;--awb-order-medium:0;--awb-spacing-right-medium:3.84%;--awb-spacing-left-medium:9.6%;--awb-width-small:100%;--awb-order-small:2;--awb-margin-top-small:-40px;--awb-spacing-right-small:0%;--awb-spacing-left-small:2.4%;\" data-scroll-devices=\"small-visibility,medium-visibility,large-visibility\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-title title fusion-title-2 fusion-sep-none fusion-title-text fusion-title-size-two\"><h2 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;\">Manufacturers can get more out of porous silicon<\/h2><\/div><div class=\"fusion-text fusion-text-1\"><p>DECKER-Anla\u00adgen\u00adbau \u2014 a spe\u00adcia\u00adlist in wet-che\u00admi\u00adcal pro\u00adces\u00adses \u2014 has laun\u00adched a sili\u00adcon puri\u00adfi\u00adca\u00adti\u00adon sys\u00adtem onto the mar\u00adket that can be used to tre\u00adat porous sili\u00adcon that is dif\u00adfi\u00adcult to clean. The clea\u00adned sili\u00adcon is then sui\u00adta\u00adble for the pro\u00adduc\u00adtion of high-per\u00adfor\u00admance solar cells and can be mar\u00adke\u00adted with cor\u00adre\u00adspon\u00addin\u00adgly hig\u00adher yields. <\/p>\n<p>Despi\u00adte good long-term fore\u00adcasts, the solar indus\u00adtry curr\u00adent\u00adly has to bridge a peri\u00adod of low pri\u00adces. Cal\u00adcu\u00adla\u00adti\u00adons are cor\u00adre\u00adspon\u00addin\u00adgly tough. Com\u00adpa\u00adnies are the\u00adr\u00ade\u00adfo\u00adre inves\u00adt\u00ading hea\u00advi\u00adly in the deve\u00adlo\u00adp\u00adment of effi\u00adci\u00adent pro\u00adces\u00adses for all stages of the pro\u00adcess chain. For sili\u00adcon manu\u00adfac\u00adtu\u00adr\u00aders, upgrading impu\u00adre sili\u00adcon to high-qua\u00adli\u00adty solar sili\u00adcon offers an oppor\u00adtu\u00adni\u00adty to increase yields.   <\/p>\n<p>Sili\u00adcon with a lower degree of puri\u00adty is crea\u00adted in the edge are\u00adas of the crys\u00adtal during the pro\u00adduc\u00adtion of high-puri\u00adty sili\u00adcon. During crys\u00adtal growth, den\u00addri\u00adte for\u00adma\u00adti\u00adon occurs at the edge are\u00adas, an unde\u00adsi\u00adra\u00adble dis\u00adrup\u00adti\u00adon of the crys\u00adtal struc\u00adtu\u00adre and pos\u00adsi\u00adbly the depo\u00adsi\u00adti\u00adon of metals, car\u00adbons or other sub\u00ads\u00adtances on this fis\u00adsu\u00adred sur\u00adface. The\u00adse are unde\u00adsi\u00adra\u00adble struc\u00adtures that can occur both in the Flui\u00addi\u00adzed Bed Reac\u00adtor FBR and in the Sie\u00admens pro\u00adcess. The addi\u00adti\u00adon of metals is known to lead to a lower mino\u00adri\u00adty car\u00adri\u00ader life\u00adtime, which redu\u00adces the effi\u00adci\u00aden\u00adcy of the solar sili\u00adcon. Other cau\u00adses of sili\u00adcon con\u00adta\u00admi\u00adna\u00adti\u00adon on the sur\u00adface and just below are the rapid dif\u00adfu\u00adsi\u00adon of metal atoms such as nickel or cop\u00adper into the sili\u00adcon at room tem\u00adpe\u00adra\u00adtu\u00adre and con\u00adta\u00admi\u00adna\u00adti\u00adon during trans\u00adpor\u00adta\u00adti\u00adon, crus\u00adhing, sto\u00adrage and pack\u00ada\u00adging.    <\/p>\n<p>Mate\u00adri\u00adal con\u00adta\u00admi\u00adna\u00adted in this way achie\u00adves lower pri\u00adces due to its lower qua\u00adli\u00adty. High-puri\u00adty sili\u00adcon has a puri\u00adty level of 10 ppb(w) in rela\u00adti\u00adon to the metal con\u00adtent and char\u00adge car\u00adri\u00ader life\u00adti\u00admes of 10,000 nano\u00adse\u00adconds. The requi\u00adre\u00adments for PV sili\u00adcon are lower, but are con\u00adti\u00adnuous\u00adly incre\u00adasing.  <\/p>\n<p>Con\u00adta\u00admi\u00adna\u00adted mate\u00adri\u00adal can be upgraded through appro\u00adpria\u00adte clea\u00adning. A hig\u00adher degree of puri\u00adty also has a posi\u00adti\u00adve effect on the per\u00adfor\u00admance of CZ pul\u00adlers, for exam\u00adp\u00adle. Howe\u00adver, clea\u00adning porous sili\u00adcon chunks is a com\u00adplex task due to the com\u00adpli\u00adca\u00adted pop\u00adcorn-like sur\u00adface of the mate\u00adri\u00adal. The mate\u00adri\u00adal has cracks, fis\u00adsu\u00adres and fis\u00adsu\u00adres and the\u00adr\u00ade\u00adfo\u00adre has a very lar\u00adge sur\u00adface area that is dif\u00adfi\u00adcult to reach with clea\u00adning media. Rin\u00adsing and dry\u00ading mate\u00adri\u00adals with such fur\u00adro\u00adwed sur\u00adfaces is just as chal\u00adlen\u00adging.    <\/p>\n<h3>Goal: High throughput at low cost<\/h3>\n<p>Wet-che\u00admi\u00adcal pro\u00adces\u00adses with both alka\u00adli\u00adne and aci\u00addic clea\u00adning media or com\u00adbi\u00adned pro\u00adces\u00adses are sui\u00adta\u00adble for sili\u00adcon clea\u00adning. The mate\u00adri\u00adal to be clea\u00adned is por\u00adtio\u00adned and moved hori\u00adzon\u00adtal\u00adly and ver\u00adti\u00adcal\u00adly in rota\u00adting bas\u00adkets or drums. <\/p>\n<p>A ful\u00adly auto\u00adma\u00adted pro\u00adcess is requi\u00adred for the sili\u00adcon as it pas\u00adses through the wet-che\u00admi\u00adcal clea\u00adning pro\u00adcess. But how can it be ensu\u00adred that the cre\u00advices and cracks are also clea\u00adned and rin\u00adsed as requi\u00adred? How can a dry\u00ading pro\u00adcess be desi\u00adgned that simul\u00adta\u00adneous\u00adly allows a high mate\u00adri\u00adal through\u00adput at com\u00adpe\u00adti\u00adti\u00adve cos\u00adts?  <\/p>\n<h3>Fast cleaning of porous silicon down to the ppbw range<\/h3>\n<p>DECKER sol\u00adves the\u00adse issues by trans\u00adfer\u00adring the clea\u00adning pro\u00adcess to a con\u00advey\u00ador belt. The sili\u00adcon chunks are gra\u00adnu\u00adla\u00adted to allow access to the sur\u00adfaces hid\u00adden in cracks and cre\u00advices. The respec\u00adti\u00adve medi\u00adum is sucked by vacu\u00adum through a defi\u00adned field on the belt on which the sili\u00adcon lies. In this way, the pro\u00adcess sol\u00adves qua\u00adli\u00adty and effi\u00adci\u00aden\u00adcy pro\u00adblems inher\u00adent in the clas\u00adsic pro\u00adcess, as etching pro\u00adces\u00adses insi\u00adde bas\u00adkets take lon\u00adger and are less pre\u00adcise than on their expo\u00adsed sur\u00adfaces. The cos\u00adts for belt fil\u00adters depend on various para\u00adme\u00adters \u2014 amor\u00adtiza\u00adti\u00adon times of around one year can be achie\u00adved under cer\u00adtain con\u00addi\u00adti\u00adons.    <\/p>\n<p>This is ground\u00adbrea\u00adking in various respects. The belt fil\u00adter vari\u00adant has a posi\u00adti\u00adve effect on many pro\u00adcess para\u00adme\u00adters: It saves cos\u00adts and time. Savings in ener\u00adgy and che\u00admi\u00adcals have a posi\u00adti\u00adve impact on the envi\u00adron\u00adment. The most important advan\u00adce, howe\u00adver, is that the tech\u00adno\u00adlo\u00adgy has ope\u00adned up the pos\u00adsi\u00adbi\u00adli\u00adty of using it on an indus\u00adtri\u00adal sca\u00adle. Last year, the pro\u00adcess recei\u00adved the Inno\u00adva\u00adti\u00adon Award at the Inter\u00adso\u00adlar trade fair. The puri\u00adfied sili\u00adcon has a puri\u00adty level of 6N and bet\u00adter, depen\u00adding on the bulk qua\u00adli\u00adty.     <\/p>\n<p>The opti\u00admiza\u00adti\u00adon of sys\u00adtems to increase pro\u00adduc\u00adtion while redu\u00adcing cos\u00adts is of gre\u00adat importance for the future of solar com\u00adpa\u00adnies. The sili\u00adcon gra\u00adnu\u00adla\u00adte etching sys\u00adtem with belt fil\u00adter now enables manu\u00adfac\u00adtu\u00adr\u00aders to upgrade porous, con\u00adta\u00admi\u00adna\u00adted sili\u00adcon quick\u00adly and cost-effec\u00adtively. <\/p>\n<\/div><div><a class=\"fusion-button button-flat fusion-button-default-size button-custom fusion-button-default button-1 fusion-button-default-span fusion-button-default-type\" style=\"--button_accent_color:var(--awb-color1);--button_border_color:var(--awb-color5);--button_accent_hover_color:var(--awb-color5);--button_border_hover_color:var(--awb-color5);--button_border_width-top:2px;--button_border_width-right:2px;--button_border_width-bottom:2px;--button_border_width-left:2px;--button-border-radius-top-left:0px;--button-border-radius-top-right:0px;--button-border-radius-bottom-right:0px;--button-border-radius-bottom-left:0px;--button_gradient_top_color:var(--awb-color5);--button_gradient_bottom_color:var(--awb-color5);--button_gradient_top_color_hover:var(--awb-color1);--button_gradient_bottom_color_hover:var(--awb-color1);--button_padding-right:50px;--button_padding-left:50px;--button_margin-top:25px;\" target=\"_self\" href=\"https:\/\/decker-anlagenbau.de\/en\/?page_id=5054\"><i class=\"fa-arrow-left fas awb-button__icon awb-button__icon--default button-icon-left\" aria-hidden=\"true\"><\/i><span class=\"fusion-button-text awb-button__text awb-button__text--default\">Back<\/span><\/a><\/div><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":2,"featured_media":5233,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"wp_typography_post_enhancements_disabled":false,"footnotes":""},"categories":[55],"tags":[],"class_list":["post-5232","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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