Journal
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
Volume 13, Issue 9, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssr.201900186
Keywords
FlexTrail; inkjet-printing; nanoparticle ink; silicon heterojunction solar cells
Funding
- German Federal Ministry of Economic Affairs and Energy within the research project ATAKAMA [0324144]
- Reiner Lemoine-Stiftung
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Bifacial busbarless silicon heterojunction (SHJ) solar cells with an edge length of 156.8 mm are metalized using a commercially available Ag nanoparticle ink on the front side. By means of inkjet-printing, a maximum conversion efficiency of 23.3% is achieved. The influence of the inkjet-printed layer number per contact finger, which is varied from one to five, on cell performance is investigated in detail. Optima are found for one and two layers, which ensure both high efficiency and low silver consumption. Furthermore, a novel metallization technology, called FlexTrail-printing, is introduced. Using the same ink as in the case of inkjet-printing, the finger width is reduced from 75 +/- 1 to 16 +/- 1 mu m. This results in an enhanced short-circuit current density and, therefore, a maximum conversion efficiency of 23.7%. Only 0.3 +/- 0.1 mg Ag nanoparticle ink (deposited at 25 degrees C substrate temperature) is consumed during FlexTrail-printing on a large-area wafer (area of 244.3 cm(2)) with a front grid of 80 fingers.
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