PRiMELiNE - Roth & Rau AG

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PRiMELiNE CdTe Activation Cluster (80 MW) CdTe Thin Film PV Modules have been recognized as the markets most cost efficient solution for PV applications. Various CdTe deposition processes have been established, whereas the basic processing around the CdS / CdTe layering is rather similar in all CdTe production lines. To support cost efficient, proven processing Roth & Rau CTF Solar offers processing clusters for all CdTe customers worldwide that can be seamlessly integrated into new production lines as well as into existing fabrication lines. The Roth & Rau CTF Solar chosen cluster design provides to the customer specific process knowledge combined with suitable process equipment and processing materials, project management and equipment startup in order to enhance product quality and module efficiencies. All PRiMELiNE CdTe Clusters are capable of processing standard module sizes of 1200 x 1600 mm (other dimensions on request), with a throughput of > 60 modules per hour. Basis for the design of all PRiMELiNE CdTe Cluster Tools is the innovative yet proven PRiMELiNE CdTe Turnkey production line. The Roth & Rau CTF Solar principle of delivering only environmental friendly tools, as realized in the entire PRiMELiNE CdTe turnkey production line, which is designed to keep the "environmental footprint" as small as possible, applies also to the For a seamless integration into existing production lines the PRiMELiNE CdTe Activation Cluster uses a standardized SECS/GEM protocol, substrate-ID-tracking (virtual / DMC reader), and adaptable horizontal communication with adjacent process tools. Nevertheless, the cluster can be operated also fully autonomous, with recipe administration on Cluster level. In detail, the PRiMELiNE CdTe Activation Cluster consists of a Coating Machine, an Activation Furnace, and a Cascade Washing/Cascade Rinsing tool. Roth & Rau Activation Cluster All fab emissions are post-treated already at tool-level so that virtually no contaminated or hazardous substances can be released to the environment. Also, the entire Cluster is enclosed with a safety housing to contain all hazardous substances and to avoid any contamination of the remaining production environment. A very critical step in processing of CdTe PV-modules is the activation of the CdS / CdTe layer stack with its target to improve the physical as well as electro-optical properties of the CdS / CdTe stack. Here, as also applied by leading CdTe solar module producers, a dedicated CdCl 2 activation, combining a CdCl 2 deposition plus a subsequent heat treatment, is used. The Roth & Rau CTF Solar processing solution provides all necessary tools plus appropriate, perfectly harmonized materials and process selection for a cost efficient activation and enhanced module efficiency. Therefore the Roth & Rau CTF Solar Activation Cluster can be a reliable retrofit for tools in existing production lines while adding improved module performance for shorter payback times of investments. However, together with the Roth & Rau CSS type of CdS / CdTe films and its characteristic properties the Activation Cluster tool offers a perfectly harmonized chemical activation process. Coating Machine During fully automatic processing within the coating tool an aqueous film containing dissolved CdCl 2 is applied in a defined thickness on the surface of the glass pane utilizing a specially engineered roller-coating system. Adding a specially formulated mixture to the coating solution allows for an excellent uniformity of the liquid film over the entire surface by improving the specific wetting characteristics. The preparation of the coating solution is done in a dedicated chemical cabinet next to the core process modules of the tool taking care of the specific handling precautions of the used materials. After successfully depositing the solution onto the substrate a drying step safely removes all liquid remnants while the CdCl 2 remains on top of the CdTe layer. As part of the Roth & Rau CTF Solar Activation Cluster all necessary peripherals to prevent the release of hazardous liquids and gases are included. A closed loop DI water supply is available as an option to account for low operating costs and low factory facility requirements.
PRiMELiNE Turnkey Solutions by Roth & Rau Key features: Short substrate edge leading Layer stack facing upwards Cycle time < 60 s Integrated substrate heating Selectable composition of CdCl 2 -solution Closed-loop waste water reconditioning Integrated exhaust filtration Safety housing Automatic cleaning routines for easy maintenance.. Cascade Washing/ Cascade Rinsing tool After deposition and tempering of the CdCl 2 layer all remaining residues are removed in a cleaning step so that the substrates can be processed in subsequent process steps without any risk of CdCl 2 contamination to tools and operators. The cascade washing machine is the final tool within performing the activation process. DI-water is applied stepwise on all substrate surfaces utilizing the eponymous "cascade"-setup of cleaning modules. The procedure is performed without adding any chemical additives to the rinse water. After removal of the CdCl 2 layer the substrates are automatically transferred to an integrated drying section where liquid film is evaporated. All used DI-water is collected and recycled on tool level. Activation Furnace In close combination with the coating tool the activation furnace supports the restructuring of the CdS / CdTe layer stack. After CdCl 2 coating the substrate enters the furnace where the glass pane is heated up to a defined and well controlled activation temperature. Temperature and transport speed are adjustable. Subsequent to the tempering process the substrate is cooled down carefully in order to avoid that thermal stress remains inside the glass. All mentioned steps are performed under standard atmospheric conditions. Key features: Long substrate edge leading Layer stack facing upwards Cycle time < 60 s Atmospheric process Activation temperature @ app. 400 °C Activation time adjustable between 10 - 20 min Integrated cooling tunnel Integrated filtration of exhaust gases - no special contaminated exhaust duct system necessary Safety housing
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PRiMELiNE - Roth & Rau AG

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