Design, development and analysis of large-area industrial silicon solar cells featuring a full area polysilicon based passivating contact on the rear and selective passivating contacts on the front

We present SERIS’ biPoly™ technology platform on large-area (M2), n-type rear-junction silicon solar cells featuring selective poly-Si/SiOx based passivated contacts on the front side and full-area poly-Si/SiOx contacts on the rear. The selective poly-Si ‘fingers’ are formed using an industrial ink-...

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Veröffentlicht in:Solar energy materials and solar cells 2023-07, Vol.256 (C), p.112351, Article 112351
Hauptverfasser: Padhamnath, Pradeep, Choi, Wook-Jin, De Luna, Gabby, Arcebal, John Derek, Rohatgi, Ajeet
Format: Artikel
Sprache:eng
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Zusammenfassung:We present SERIS’ biPoly™ technology platform on large-area (M2), n-type rear-junction silicon solar cells featuring selective poly-Si/SiOx based passivated contacts on the front side and full-area poly-Si/SiOx contacts on the rear. The selective poly-Si ‘fingers’ are formed using an industrial ink-jet masking process followed by wet-chemical etching. The metal contacts are formed by an industrial screen-printing process using high-temperature fire-though metal pastes. We obtain excellent passivation on the front and rear surfaces, resulting in iVoc values between 720 mV and 730 mV on unmetallized solar cells. After high-temperature metallization, we achieve 22% efficiency on solar cells with selective poly-Si fingers on the front. We further develop the model for biPoly™ solar cells and with the help of a detailed loss analysis and simulations, identify the various loss components to identify the device modifications required for efficiency improvements. Detailed power loss breakdown at MPP of biPoly™ solar cells with polysilicon based passivating contacts on full area and selectively under the metal contacts on the front. Despite the parasitic absorption in the poly-Si limiting the current, the recombination losses represent the largest source of loss owing to firing instability of the poly-Si layer on textured surface. [Display omitted] •Design, development and analysis of solar cells with polysilicon based passivating contacts on both front and rear sides.•Solar cells fabricated with polysilicon present only under the metal contacts on the front side.•Detailed characterization and loss analysis of the fabricated devices to identify the sources limiting performance.•Insights from detailed modelling and simulation reveal recombination losses emerge to be the leading limiting factor.•Developed model could be used to identify the limiting factors and future research direction for improving efficiencies.
ISSN:0927-0248
1879-3398
DOI:10.1016/j.solmat.2023.112351