This dataset contains the complete outdoor measurement and analysis data for a mechanically stacked, four-terminal (4T) gallium arsenide (GaAs)//silicon (Si) tandem solar mini-module deployed from October 2019 to January 2021 at the Solar Radiation Research Laboratory (SRRL) in Golden, Colorado, USA. The data support a performance modeling and degradation analysis framework for tandem photovoltaic devices, as described in the accompanying publication. The dataset includes: (1) current–voltage (J–V) characteristics of each sub-cell measured approximately every five minutes, with extracted performance parameters; (2) spectral irradiance from an EKO MS-710 WISER spectroradiometer, along with derived spectral mismatch ratios (SMR) and average photon energy (APE); (3) one-minute resolution meteorological data from the co-located SRRL weather station and GPS-derived precipitable water vapor (PWV); (4) pre-deployment laboratory characterization (external quantum efficiency, J–V curves, standard test conditions parameters); (5) outdoor-extracted temperature and PWV correction coefficients; and (6) PVcircuit equivalent-circuit simulation outputs used for model validation. Degradation rates of −4.1 ± 0.2 %/year (GaAs) and −2.5 ± 0.9 %/year (Si) were determined using a filtering and normalization methodology adapted for fixed-tilt tandem modules. All data are provided in open, portable formats (Apache Parquet, CSV, JSON) to enable full reproducibility of the published analysis.
| Name | Size | Type | Resource Description | History |
|---|---|---|---|---|
| gaas-si-tandem-outdoor-deployment-data.zip | 2.1 GB | Archive | The dataset comprises 32 files (~3.6 GB) organized into six subdirectories: module_performance/ contains Parquet files with scalar J–V parameters (Voc, Isc, Pmp) and environmental conditions for each sub-cell measurement, plus CSV files with full IV curve data points; spectral/ contains Parquet files of OTF-corrected spectroradiometer data (807 wavelength channels, 343–1650 nm), derived spectral mismatch ratios, and average photon energy; meteorological/ contains a Parquet file of one-minute SRRL weather station data (27 selected channels from 236 available) and a CSV of GPS-derived precipitable water vapor; lab_reference/ contains the pre-deployment laboratory characterization (EQE, IV, STC parameters) in Excel and CSV formats, plus the ASTM G173 AM1.5G reference spectrum; coefficients/ contains CSV files of outdoor-extracted temperature and PWV correction coefficients with a JSON summary; and model/ contains PVcircuit simulation outputs (JSON and Parquet) for measured-vs.-modeled comparisons of power, Voc, and temperature-dependent behavior. A machine-readable manifest.json lists all files with their paths and sizes. |
Springer, Martin, Robert Witteck, Tim Silverman, John Geisz, Bill McMahon, and Emily Warren. 2026. "Outdoor Deployment Data for a Four-Terminal GaAs//Si Tandem Solar Mini-Module." NLR Data Catalog. Golden, CO: National Laboratory of the Rockies. Last updated: April 3, 2026. DOI: 10.7799/3026700.