Simple processing of back-contacted silicon heterojunction solar cells using selective-area crystalline growth
Seif, Johannes Peter
De Wolf, Stefaan
KAUST DepartmentKAUST Solar Center (KSC)
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AbstractFor crystalline-silicon solar cells, voltages close to the theoretical limit are nowadays readily achievable when using passivating contacts. Conversely, maximal current generation requires the integration of the electron and hole contacts at the back of the solar cell to liberate its front from any shadowing loss. Recently, the world-record efficiency for crystalline-silicon single-junction solar cells was achieved by merging these two approaches in a single device; however, the complexity of fabricating this class of devices raises concerns about their commercial potential. Here we show a contacting method that substantially simplifies the architecture and fabrication of back-contacted silicon solar cells. We exploit the surface-dependent growth of silicon thin films, deposited by plasma processes, to eliminate the patterning of one of the doped carrier-collecting layers. Then, using only one alignment step for electrode definition, we fabricate a proof-of-concept 9-cm2 tunnel-interdigitated back-contact solar cell with a certified conversion efficiency >22.5%.
CitationTomasi A, Paviet-Salomon B, Jeangros Q, Haschke J, Christmann G, et al. (2017) Simple processing of back-contacted silicon heterojunction solar cells using selective-area crystalline growth. Nature Energy 2: 17062. Available: http://dx.doi.org/10.1038/nenergy.2017.62.
SponsorsThis work was supported by the Swiss Commission for Technology and Innovation (CTI) by the Swiss Federal Office for Energy (SFOE), and by the Fonds National Suisse Reequip Program. The authors thank Meyer Burger Research for scientific partnership and financial support; D. Lachenal and B. Strahm for support and collaboration in back-contacted silicon heterojunction solar-cell development; J. Hermans and Meyer Burger B.V. for the support in inkjet printing; M. Pickrell and SunChemicals for supplying the hot melt; the Academic Writing Services at KAUST for text editing; M. J. Lehmann, N. Badel and H. Watanabe at EPFL and CSEM for their support in back-end processing; and A. Hessler at EPFL and CIME for the TEM observations.