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Transcript of 7 Novemeber 2014 Name 1 This report was submitted in compliance with the UNCC Code of Student...
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ECGR 3090 solar cell fabrication
7 Novemeber 2014Name
This report was submitted in compliance with the UNCC Code of Student AcademicIntegrity (2003-05 UNCC Catalog, p 276) AB OP
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ECGR 3090 Solar Cells - Summary
A solar cell uses the photovoltaic effect to convert sun light into usable electricity.
The goal in this class was to fabricate a silicon solar cell in the Cameron clean room using existing equipment and processes.
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Clean Room Safety
A safety test must be completed and passed before entering the clean room.
Chemical gloves are worn when handling any chemical.
Chemicals are disposed of properly and in the correct containers.
Material Safety Data Sheets are placed in each room with harmful chemicals.
Safety shower and eye wash are placed in case of a chemical spill on a person.
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Contamination Mitigation
Different tweezers are placed in each station.
Special garments are worn at all times while inside the clean room.
Clean room is kept filtered to keep as much dust out as possible.
Sticky floor mats are placed at all entrances to the clean room to get dirt off of shoes.
Fabrication Photos
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4 Point Probe
Photolithography
Front Side Conductor Deposition
Diffusion in Furnace
Fabrication Photos
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Annealing Furnace – 450C
Wafer Dicing
Sputtering Tool – Backside Deposition
PECVD - Antireflective SiO2
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Solar Cell TestingCell placed on test plate with probe on center bus
Cell is illuminated by the test lamp – Original test was done at 0.93 sunSecond test was done at .88 sunAir mass filter was 1.5 for both tests
Test results appear as an IV plot on the computer
Small cell in testing
Large cell in testing
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Results
Large CellVoc 0.6 VIsc 140 mA
Vmp 0.25 VImp 75 mA
Max current 150 mASize 6.0588 cm^2
Fill factor 0.223Jsc 23.107 mA/cm^2
Efficiency 3.33%