Design, fabrication and characterisation of a 24.4% efficient interdigitated back contact solar cell

By E. Franklin, K. Fong, K. R. McIntosh, A. Fell, Andrew Blakers, T. Kho, D. Walter, Da Wang, Ngwe Zin, Matthew Stocks and 7 more. 2016

179 citations recorded by the source corpus.

The interdigitated back contact (IBC) solar cells developed at the Australian National University have resulted in an independently confirmed (Fraunhofer Institut für Solare Energiesysteme (ISE) CalLab) designated‐area efficiency of 24.4 ± 0.7%, featuring short‐circuit current density of 41.95 mA/cm2, open‐circuit voltage of 703 mV and 82.7% fill factor. The cell, 2 × 2 cm2 in area, was fabricated on a 230 µm thick 1.5 Ω cm n‐type Czochralski wafer, utilising plasma‐enhanced chemical vapour deposition (CVD) SiNx front‐surface passivation without front‐surface diffusion, rear‐side thermal oxide/low‐pressure CVD Si3N4 passivation stack and evaporated aluminium contacts with a finger‐to‐finger pitch of 500 µm. This paper describes the design and fabrication of lab‐scale high‐efficiency IBC cells. Characterisation of optical and electronic properties of the best produced cell is made, with subsequent incorporation into 3D device modelling used to accurately quantify all losses. Loss analysis demonstrates that bulk and emitter recombination, bulk resistive and optical losses are dominant and suggests a clear route to efficiency values in excess of 25%. Additionally, laser processing is explored as a means to simplify the manufacture of IBC cells, with a confirmed efficiency value of 23.5% recorded for cells fabricated using damage‐free deep UV laser ablation for contact formation. Meanwhile all‐laser‐doped cells, where every doping and patterning step is performed by lasers, are demonstrated with a preliminary result of 19.1% conversion efficiency recorded. Copyright © 2014 John Wiley & Sons, Ltd.

Subfields: Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/20a00804602dfe16cd09dc83fcaef2af1b764392

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In Atomic and Molecular Physics, and Optics

Andrew Blakers

In Electrical and Electronic Engineering

Citations in the corpus

Polyimide for silicon solar cells with double-sided textured pyramids (2018, background): “Light trapping schemes in experimental high-efficiency silicon solar cells developed to date have had a textured front surface and a planar rear surface [2-5, 22, 23].”