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== Hilfreiche Tools== |
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Excel zu Wikitabelle: |
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[http://tools.wmflabs.org/magnustools/tab2wiki.php] |
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Device location: F&E4-SOLAR LAB |
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Lab location: Building 310 Room no. 203 |
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Phone number: |
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Lab leader: Ulrich Wilhelm Paetzold |
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Principal users: Ulrich Wilhelm Paetzold, Wensheng Yan. |
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Access: Only trained and authorized users may use the setup. |
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== '''Short Description''' == |
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WCT-120 instruments showcase our unique measurement and analysis techniques, including the highly regarded Quasi-Steady-State Photoconductance (QSSPC) lifetime measurement method developed by Sinton Instruments in 1994. The QSSPC technique is ideal for monitoring multicrystalline wafers, dopant diffusions, and low-lifetime samples. This method complements the use of the transient photoconductance technique that is also standard on this instrument.The QSSPC lifetime measurement also yields the implied open-circuit voltage (versus illumination) curve, which is comparable to an I-V curve at each stage of a solar cell process. |
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WCT System Capabilities: |
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Primary application: Step-by-step monitoring and optimization of a fabrication process. |
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Other applications: |
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• Monitoring initial material quality |
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• Detecting heavy metals contamination during wafer processing |
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• Evaluating surface passivation and emitter dopant diffusion |
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• Evaluating process-induced shunting using the implied I-V measurement |
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[[Datei:product-photo-WCT-120-main-WM-v2.jpg]] |
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'''Start-up Procedure''' |
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== Headline text == |
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Standard Operating Procedure: |
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Assembly Equipments |
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Stages : WCT-120 & Suns-Voc |
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Flash Lamp Assembly |
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Bulb & Reflector |
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Power Supply |
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Flash Lamp Trigger |
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Flash Lamp Tower |
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Filters |
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Neutral Density Filters |
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IR Pass Filter |
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Visible Pass blue filter |
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Adjustable height Stand |
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Data Acquisition System |
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Connector Box |
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BNC Cables , thermocouple & other Probes |
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PCI Card connection with Computer |
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Precautions: |
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1.Do NOT touch the filters or the filter tray which has glass diffuser glued into it, with bare |
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hands. Use gloves or tissue paper for the same. |
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2.Make sure that the filter tray/flash mount assembly does NOT fall down while sliding it over the flash tower for adjusting height of the flash. |
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3.Ensure that the BNC cable and flash trigger connections are in place based on the measurement to be done i.e. to lifetime tester stage or Suns VOC stage. |
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4.Note down the height of the flash from the stage, the setting on the flash (1/1 or 1/64) and the filter being used during measurement. Different users tend to change this according to their requirements. |
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5.Make sure that the reference cell is NOT covered during the measurement. |
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6.Do NOT start the measurement on Lifetime tester until it is thermally stabilized i.e. Red LED is OFF. |
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7.During chemical passivation, ensure that solution does NOT spill on the stage. |
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8.For Suns VOC measurement, ensure that sample consists of P-N junction and both P N sides can be probed properly. |
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9.Ensure that proper action is taken for addressing error messages in the measurement:i.Saturated reference cell: Height of the flash is adjusted to change the intensity of light to avoid saturation of reference cell.ii.Min MCD < Specified MCD < Max MCD: Change the specified minority carrier density to fit in the measured range of minority carrier density.iii.Remove the sample on lifetime tester stage during zeroing of the instrument: No sample in the vicinity of stage during zeroing of the instrument. |
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10.Ensure that SUMMARY file is NOT cut pasted during the data transfer: |
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