Effect of Ag Particle Size in Thick-Film Ag Paste on the Electrical and Physical Properties of Screen Printed Contacts and Silicon Solar Cells
| Autor: | Ajeet Rohatgi, Kenta Nakayashiki, Aziz S. Shaikh, Steve S. Kim, Mohamed M. Hilali, Srinivasan Sridharan, Chandra Khadilkar, Robert C. Reedy |
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| Rok vydání: | 2006 |
| Předmět: |
Materials science
Silicon Equivalent series resistance Renewable Energy Sustainability and the Environment Contact resistance Analytical chemistry chemistry.chemical_element Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry Materials Chemistry Electrochemistry Metal powder Particle Particle size Crystallite Ohmic contact |
| Zdroj: | Journal of The Electrochemical Society. 153:A5 |
| ISSN: | 0013-4651 |
| DOI: | 10.1149/1.2126579 |
| Popis: | The impact of the Ag particle (metal powder in the screen printed paste) size on the quality of Ag thick-film ohmic contacts to high-sheet-resistance emitters of Si solar cells is investigated. Spherical particle size wasvaried in the range of 0.10-10 μm (ultrafine to large). Even though ultrathin glass regions are achieved for the large particle paste, giving low specific contact resistance (ρ c ), secondary ion mass spectroscopy measurements showed a higher Ag concentration (>10 1 5 cm - 3 ) at the p-n junction that increased the junction leakage current (J o 2 ) and decreased the V o c by ∼7 mV and fill factor (FF) by ∼0.02. Pastes with ultrafine Ag particles generally produced a thick glass layer at the Ag-Si contact interface, which increased ρ c and series resistance (R s ) (≥ 1 Ω cm 2 ), and lowered the FF by ∼0.03. Small to medium size Ag particles in the paste produced thin glass regions and many regularly distributed Ag crystallites at the contact interface. This resulted in low R s (< 1 Ω cm 2 ), high shunt resistance (60,558 Ω cm 2 ), low J o 2 (∼20 nA/cm 2 ), and high FF (0.781). Cell efficiencies of ∼17.4% were achieved on untextured float zone Si with 100 Ω/□ emitter by rapid firing of screen printed contacts in a lamp-heated belt furnace. |
| Databáze: | OpenAIRE |
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