Elucidating the Process of Accurate Spectral Calibration for Tandem I-V Measurement using Multi-Lamp Light Sources
Year: 2025
Type: conference-paper
Abstract: Reproducing the reference spectrum, AM1.5G, using solar simulators is essential for reporting the I-V performance of tandem solar cells. The International Electrotechnical Commission (IEC) presents the classification of solar simulators spectra in IEC 60904-9 and the spectral calibration for tandem devices in IEC 60904-1-1. However, implementation of these standards using multi-lamp light sources can be challenging. This study presents a process for fulfilling both IEC standards using a multi-lamp light source with 21 tunable intensity channels of different peak wavelengths. A spectrum fitting method based on Gram-Schmidt orthonormalisation is introduced to approximate the AM1.5G spectrum from a known set of LED inputs, enabling forward modelling of the output spectrum. Non-linearity and spectral shift corrections ensure that the modelled spectrum remains accurate. A calibration process is presented to satisfy both solar simulator classification and the IEC-defined spectral mismatch factor and matching factor thresholds. The method is validated on three perovskite–silicon tandem cells, all of which achieved | 1-M | < 0.05 and |1-Z | < 0.03 and for both sub-cells. This framework enables standard-compliant spectral simulation of AM1.5G for I-V of perovskite-based tandem devices.
Source: EU PVSEC
Authors: Bourgeois, Antoine, Hadiwidjaja, Stella, Nicot-Senneville, Zoltan, Ye, JiaYi, Choi, Kwan Bum, Zhou, Qilin, Hou, Yi
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7106230678
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