Longi 26.8% HJT
Models Longi's ~26.8% nanocrystalline-silicon HJT cell, calibrating the optical model to digitized figures and using the Niewelt Auger model.
This example models Longi’s high-efficiency silicon heterojunction (HJT) cell with nanocrystalline-silicon hole-contact layers, reaching roughly 26.8% efficiency (Lin et al., Nature Energy 8, 2023). Electro-optical properties are extracted from the published data, and the optical model is calibrated to digitized experimental figures (specifically Fig. 5b), matching escape reflection and near-infrared EQE for the light-trapping model.
Recombination is modeled with the Niewelt Auger model, which is newer than the Richter model used in the original publication; as a result, the fitted bulk and surface recombination settings can differ from the paper. The example notes these differences reflect uncertainties inherent in Auger modeling rather than modeling errors. Both a full settings file and a simplified version compatible with the free tier are provided.
What this example covers:
- Extracting electro-optical parameters from published HJT data
- Calibrating the light-trapping/optical model to digitized figures (escape reflection, NIR EQE)
- Recombination modeling with the Niewelt Auger model vs. the paper’s Richter model
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