Zusammenfassung: | |
In this paper, we investigate the surface recombination of local screen-printed aluminum contacts applied to rear passivated solar cells. We measure the surface recombination velocity by microwave-detected photoconductance decay measurements on test wafers with various contact geometries and compare two different aluminum pastes. The aluminum paste which is optimized for local contacts shows a deep and uniform local back surface field that results in Smet = 600 cm/s on 1.5 Ωcm p-type silicon. In contrast, a standard Al paste for full-area metallization shows a nonuniform back surface field and a Smet of 2000 cm/s on the same material. We achieve an area-averaged rear surface recombination velocity S rear = (65 ± 20) cm/s for line contacts with a pitch of 2 mm. The application of the optimized paste to screen-printed solar cells with dielectric surface passivation results in efficiencies of up to 19.2 % with a Voc = 655 mV and a Jsc = 38.4 mA/cm2 on 125×125 mm2 p-type Cz silicon wafers. The internal quantum efficiency analysis reveals Srear = (70 ± 30) cm/s which is in agreement with our lifetime results. Applying fine line screenprinting, efficiencies up to 19.4 % are demonstrated.
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Lizenzbestimmungen: | CC BY-NC-ND 3.0 Unported - https://creativecommons.org/licenses/by-nc-nd/3.0/ |
Publikationstyp: | Article |
Publikationsstatus: | publishedVersion |
Erstveröffentlichung: | 2011 |
Schlagwörter (englisch): | Photovoltaics, Silicon, Solar cells, Surface passivation, Aluminum contacts, Aluminum paste, Back surface fields, Contact geometry, Decay measurements, Dielectric surface, High efficiency, Internal quantum efficiency, Line contact, P-type, P-type silicon, Photoconductance, Photovoltaics, Rear surfaces, Screen-printed, Screen-printed solar cells, Surface passivation, Surface recombination velocities, Surface recombinations, Test wafers, Aluminum, Crystalline materials, Efficiency, Nanostructured materials, Optimization, Passivation, Photovoltaic effects, Semiconducting silicon compounds, Silicon solar cells, Silicon wafers, Surfaces |
Fachliche Zuordnung (DDC): | 530 | Physik |
Kontrollierte Schlagwörter: | Konferenzschrift |
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