ZOLIX SolarCellScan 10-Film Large-Area Thin-Film Solar Cell Quantum Efficiency Measurement System

Overview

The ZOLIX SolarCellScan 10-Film is a purpose-engineered quantum efficiency (QE) measurement system designed specifically for large-area thin-film photovoltaic devices. It operates on the principle of monochromatic photocurrent spectroscopy—where a tunable, spectrally resolved light beam (generated via grating monochromator and calibrated broadband sources) illuminates the device under test while a precision current amplifier measures the resulting photocurrent under controlled bias and illumination conditions. The system calculates external quantum efficiency (EQE), internal quantum efficiency (IQE), spectral responsivity (R_λ), reflectance (R%), transmittance (T%), and short-circuit current density (J_sc) with traceable calibration against NIST-traceable reference detectors. Unlike general-purpose spectroradiometers, the SolarCellScan 10-Film integrates optical, electronic, and mechanical subsystems—including motorized sample positioning, automated wavelength scanning, and synchronized lock-in or DC current acquisition—to deliver metrologically robust data compliant with international PV characterization standards.

Key Features

• Modular dual-source architecture supporting xenon arc (UV–VIS) and tungsten-halogen (VIS–NIR) lamps, enabling seamless spectral coverage from 300 nm to 1700 nm
• Dedicated large-sample chamber accommodating substrates up to 300 mm × 300 mm, with integrated rear-electrode contact interface for low-resistance probing of transparent conductive oxide (TCO) or metal back contacts
• DC-only measurement mode optimized for stability and signal-to-noise ratio in low-current thin-film devices; fully compatible with optional AC/lock-in upgrade paths
• Automated QE mapping capability via programmable XY translation stage (optional QE-D1), supporting spatially resolved EQE/IQE analysis at user-defined step resolution (down to 100 µm)
• Integrated reflectance and transmittance accessories (QE-B7, QE-B8, QE-C2) enabling concurrent optical loss quantification without repositioning the sample
• Factory-calibrated reference detectors—including Si (300–1100 nm), InGaAs (800–1700 nm and 800–2500 nm variants)—supplied with NIST-traceable calibration certificates per ISO/IEC 17025

Sample Compatibility & Compliance

The SolarCellScan 10-Film supports quantitative characterization of diverse thin-film PV technologies including amorphous silicon (a-Si), microcrystalline silicon (µc-Si), cadmium telluride (CdTe), copper indium gallium selenide (CIGS), organic photovoltaics (OPV), perovskite solar cells (PSCs), and dye-sensitized solar cells (DSSCs). It accommodates single-junction, tandem, and multi-junction architectures, with configurable bias light (QE-A1/A2) and voltage bias (QE-BVS) modules to replicate operational illumination conditions per IEC 60904-8 Annex B. All measurements adhere to IEC 60904-8:2017 requirements for spectral responsivity determination and are traceable to national metrology institutes. The system’s optical design minimizes stray light (<0.01% at 600 nm), satisfying ISO 18557:2021 criteria for high-fidelity EQE mapping in industrial R&D environments.

Software & Data Management

Control and analysis are performed using ZOLIX QEMaster v4.x—a Windows-based application developed for photovoltaic metrology. The software provides full instrument orchestration: automatic wavelength stepping, integration time optimization, dark-current subtraction, and real-time J_sc calculation via numerical integration of EQE spectra. Raw data export is supported in CSV, HDF5, and XML formats for third-party analysis (e.g., MATLAB, Python SciPy). Audit trails, user access control, and electronic signature functionality comply with GLP and FDA 21 CFR Part 11 requirements when configured with optional validation packages. Calibration metadata—including detector responsivity curves, lamp spectral irradiance, and monochromator bandpass profiles—is embedded directly into each measurement file.

Applications

• Process development and yield optimization of roll-to-roll deposited CIGS and CdTe modules
• Spatial uniformity assessment of large-area perovskite films via EQE mapping
• Optical loss decomposition (reflection, transmission, parasitic absorption) in tandem cell stacks
• Validation of optical modeling (e.g., transfer matrix method) against empirical IQE data
• Accelerated aging studies correlating spectral response degradation with encapsulation performance
• Interlaboratory round-robin testing under IEA-PVPS Task 12 protocols

FAQ

Does the SolarCellScan 10-Film support IQE measurement for opaque substrates?
Yes—by integrating QE-B7 (300–1100 nm) or QE-B8 (800–1700 nm) transmittance accessories and QE-C2 diffuse reflectance modules, IQE is calculated using the standard formula: IQE(λ) = EQE(λ) / [1 − R(λ) − T(λ)].
Can the system measure devices under forward bias or reverse bias?
Yes—the optional QE-BVS bias voltage source provides ±10 V adjustable DC bias, enabling characterization across the full J–V quadrant.
Is mapping functionality included as standard or optional?
Two-dimensional mapping is an optional configuration (requires QE-D1 motorized stage and QEMaster Mapping Module); however, all hardware interfaces and software hooks are pre-installed in the base system.
What calibration standards are supplied with the system?
Each shipment includes a certified Si reference detector (QE-B3, 300–1100 nm), a calibrated InGaAs detector (QE-B2, 800–1700 nm), and a primary-standard crystalline silicon reference cell (QE-B1), all with ISO/IEC 17025-compliant calibration certificates.
How is stray light performance verified?
Stray light is characterized per ISO 18557 using the “bandpass suppression” method at multiple wavelengths; typical values are <0.008% at 600 nm and <0.015% at 1000 nm, documented in the factory acceptance test report.