Litos Lite
ISOS-Compliant Stability Tester with Parallel JV & MPP Tracking
Fluxim’s Litos Lite enables high-throughput solar cell research with advanced JV, MPP and stability testing under ISOS protocols.
Litos Lite is a platform to perform parallel JV and stability measurements on organic, perovskite solar cells and perovskite/silicon tandem solar cells. This innovative characterization hardware can perform JV measurements on up to 56 lab-scale devices (16 for tandems) and up to 8 high-current or 4 high-voltage minimodules. Stress the solar cells with either constant voltage, current or individual MPP tracking on each of the devices under stress. The temperature of the samples can be controlled from 25 °C up to 85°C.
Litos Lite is fully compatible with standard ISOS protocols for stability testing, making it ideal for both academic and industrial photovoltaic R&D.
QUICK LINKS
Key Advantages
Custom Sample Holder
ISOS Protocol Compatibility
Solar Simulator Integration
Measurement Software
Litos Lite User Feedback from Leading Perovskite Solar Cell Researcher
Leading perovskite researcher Prof. Giulia Grancini shares her experience using Litos Lite for stability testing.
“5 star recommendation for LITOS LITE and FLUXIM support. A great choice for my lab, for setting up a nicely working system for monitoring stability under different conditions of our perovskite solar cells! Great communication with FLUXIM for installation, training and support! Highly recommended!”
Prof. Giulia Grancini
Director of ERC HYNANO project and pvsquared2 team and University of Pavia, Italy
Watch how LITOS LITE streamlines stability testing workflows in advanced solar cell R&D. This demo covers setup, JV sweep automation, MPP tracking, and how Litos Lite supports major ISOS protocols like ISOS-D, ISOS-L, and ISOS-V. Request a demo.
Get a Quote for Litos Lite
QUESTIONS?
Talk to Litos Lite Product Manager,
Dr. Antonio Cabas Vidani
Email: info@fluxim.com
Telephone.: +41 44 500 47 70
Advantages of using Litos Lite
High-throughput JV and stability & lifetime measurements. Compatible with the ISOS protocols. MPP tracking routines.
Up to 56 independent channels for parallel measurements and stressing of multiple solar cells. Versions with 24, 32, 40 and 48, channels are also available.
NEW: Measure up to 16 Perovskite/Silicon Tandem Solar Cells in parallel.
Maximum current = 50 mA. Voltage range = +/- 10V.
Custom-made sample holder to be easily mounted under your solar simulator.
The sample holder is equipped with Peltier modules for accurate control of the temperature. The PID controller allows the stabilization of the temperature between 25 and up to 85 °C and temperature cycling. (coming soon)
High-current module for up to 8 large area samples in parallel.
Maximum current = 400 mA. Voltage range = +/- 10V
High-current module combined with extended voltage range for up to 4 minimodules of 10x10cm2 (depending on the design of the minimodule.)
Maximum current = 400 mA. Voltage range = +/- 19V (coming soon)
Possibility to connect a second sample holder (without temperature control) sharing the same 56 channels with the primary sample holder.
A solar simulator is available as an option. The solar simulators from Wavelabs can be controlled by the Litos Lite software.
Professional, user-friendly software for measurement automation. Automatic cycling between JV and stressing conditions. Sweep any measurement parameter: light-intensity, temperature, JV scan rate, …
Litos Lite Review
“Highly recommended. We have one in our labs and we are saving hours of work by measuring many samples at one time. No time to build our setup up so this was a great purchase!”
Prof Dr. Juan-Pablo Correa-Baena
Georgia Institute of Technology
| Litos Lite Specifications | |
|---|---|
| Best For | High-throughput, high-precision JV & stressing of perovskite solar cells |
| Functionality | Parallel JV, Stressing at MPP, constant-V, constant-J |
| Operation | Specify measurement conditions on each pixel. |
| No. of Channels | 24, 32, 40, 48, 56 |
| Sample Holder | Single chamber. Custom-made. Can be set up in a glovebox. |
| Sample Geometry | Customised to your device layout and amount of samples. Max thickness up to 4mm. |
| Voltage Range | ± 10V |
| Max Current/Channel | 50 mA. Up to 50 × 56 = 2.8 A |
| Current Resolution | Best/typical: 1 μA / 5 μA |
| Illumination | External. Compatible with Wavelabs Sinus 70/230 Solar Simulators, or custom illumination, e.g. LED array. |
| Temperature Range | Stabilize between 25 °C – 85 °C with temperature cycling. |
| Tandem Compatibility | Up to 16 Perovskite/Silicon Tandem Solar Cells. Max current = 50 mA. Voltage range = ±10 V. |
| Mini Module Compatibility | Up to 4 minimodules of 10×10 cm² (depends on design). Max current = 400 mA. Voltage = ±19 V |
| High Current Module | Up to 8 large area samples in parallel. Max current = 400 mA. Voltage = ±10 V |
Litos Lite Specifications for Perovskite Solar Cell Stability Testing
Below you’ll find the technical specifications for Litos Lite, Fluxim’s high-throughput platform for solar cell JV and stability testing, including support for ISOS protocols, tandem cells, and minimodule compatibility.
Sample Holders
Litos Lite sample holders are tailored to your device layout and selected channel configuration. We offer:
Custom holders for precise alignment
Swappable holders for different layouts
A universal stage for up to 8 devices
Switching between configurations is effortless — just clip in a new holder and activate it in the software.
All sample holders include a gas inlet and outlet and can be sealed with a quartz window to maintain a nitrogen-rich environment. Load inside a glovebox and measure outside.
Built-in Sensors
Environmental sensors inside each holder track temperature and humidity in real-time, providing accurate data throughout your measurement routine.
Simple and Secure Loading
Controlled Atmosphere
Each holder includes an alignment guide to position your samples. Add masks if needed, then secure everything with a magnetic snap cover. Spring-loaded legs ensure reliable electrical contact.
Litos Lite now supports the measurement and stability testing of tandem Perovskite/Silicon solar cells. This new capability allows researchers to conduct high-throughput, parallel testing of Perovskite/Silicon tandem solar cells, ensuring precise and consistent data collection.
Key benefits include:
✅ Stress up to 16 Perovskite/Silicon solar cells in parallel
✅ Customized layouts tailored to your research needs
✅ Stress each cell at individual bias condition or MPP
✅ Seamless integration with our user-friendly software
This new sample holder is now available for immediate order to all existing Litos Lite customers. If you’re considering a complete Litos Lite package, we’d love to discuss your research needs and explore how Litos Lite can be tailored to support your work.
Get a Quote for Litos Lite and the new Tandem Sample Holder Here
Measuring Tandem Perovskite/Silicon Solar Cells with Litos Lite
This short video demonstrates the temperature distribution across the Litos Lite sample holder during a temperature sweep recorded with an IR camera.
The temperature spreads uniformly across 20 samples at any temperatures between 25°C and 85°C. Temperature cycling is also possible.
Perfect for researchers working on:
Perovskite and organic solar cells
Thermal stress and stability protocols (ISOS)
Multi-device measurements
Litos Lite Sample Holder Temperature Map with IR
Litos Lite Compatibility with the ISOS protocols
ISOS protocols are internationally recognized procedures for evaluating the long-term stability of solar cells under real-world conditions. Whether you're running dark storage (ISOS-D), light soaking (ISOS-L), or bias stress (ISOS-V) tests, choosing the right equipment is critical. The table below shows exactly which ISOS protocols can be executed using Fluxim’s Litos Lite — a high-throughput platform designed for parallel JV and stability testing of organic, perovskite, and tandem solar cells.
ISOS Protocols Compatibility with Litos Lite
This table summarizes the compatibility of Fluxim's Litos Lite system with standard ISOS stability testing protocols under various environmental and operational conditions.
| Protocol | Category | Light Condition | Temperature | Atmosphere | Load | Compatible with Litos Lite |
|---|---|---|---|---|---|---|
| Dark Storage (ISOS-D) | ||||||
| ISOS-D-1 | Dark Storage | Off | 25 / Ambient | Ambient | OC | Yes |
| ISOS-D-2 | Dark Storage | Off | 65, 85 | Ambient | OC | Yes |
| ISOS-D-3 | Dark Storage | Off | 65, 85 | 85% | OC | No |
| ISOS-D-1I | Dark Storage | Off | 25 / Ambient | Nitrogen | OC | Yes |
| ISOS-D-2I | Dark Storage | Off | 65, 85 | Nitrogen | OC | Yes |
| Bias Stability (ISOS-V) | ||||||
| ISOS-V-1 | Bias Stability | Off | 25 / Ambient | Ambient | OC, MPP, Vrev | Yes |
| ISOS-V-2 | Bias Stability | Off | 65, 85 | Ambient | OC, MPP, Vrev | Yes |
| ISOS-V-3 | Bias Stability | Off | 65, 85 | 85% | OC, MPP, Vrev | No |
| ISOS-V-1I | Bias Stability | Off | 25 / Ambient | Nitrogen | OC, MPP, Vrev | Yes |
| ISOS-V-2I | Bias Stability | Off | 65, 85 | Nitrogen | OC, MPP, Vrev | Yes |
| Thermal Cycling (ISOS-T) | ||||||
| ISOS-T-1 | Thermal Cycling | Off | Cycled:RT to 65, 85 | Ambient | OC | Yes |
| ISOS-T-2 | Thermal Cycling | Off | Cycled:RT to 65, 85 | Ambient | OC | Yes |
| ISOS-T-3 | Thermal Cycling | Off | Cycled:-40 to 85 | <55% | OC | No |
| ISOS-T-1I | Thermal Cycling | Off | Cycled:RT to 65, 85 | Nitrogen | OC | Yes |
| ISOS-T-2I | Thermal Cycling | Off | Cycled:RT to 65, 85 | Nitrogen | OC | Yes |
| ISOS-T-3I | Thermal Cycling | Off | Cycled:-40 to 85 | Nitrogen | OC | No |
| Light Soaking (ISOS-L) | ||||||
| ISOS-L-1 | Light Soaking | Constant | 25 / Ambient | Ambient | MPP or OC | Yes |
| ISOS-L-2 | Light Soaking | Constant | 65, 85 | Ambient | MPP or OC | Yes |
| ISOS-L-3 | Light Soaking | Constant | 65, 85 | 50% | MPP | No |
| ISOS-L-1I | Light Soaking | Constant | 25 / Ambient | Nitrogen | MPP or OC | Yes |
| ISOS-L-2I | Light Soaking | Constant | 65, 85 | Nitrogen | MPP or OC | Yes |
| Outdoor Stability (ISOS-O) | ||||||
| ISOS-O-1 | Outdoor Stability | Outdoor | Ambient Outdoor | Ambient | MPP or OC | No |
| ISOS-O-2 | Outdoor Stability | Outdoor | Ambient Outdoor | Ambient | MPP or OC | (Yes) |
| ISOS-O-3 | Outdoor Stability | Outdoor | Ambient Outdoor | Ambient | MPP | No |
| Light Cycling (ISOS-LC) | ||||||
| ISOS-LC-1 | Light Cycling | Cycled | 25 / Ambient | Ambient | MPP or OC | Yes |
| ISOS-LC-2 | Light Cycling | Cycled | 65, 85 | Ambient | MPP or OC | Yes |
| ISOS-LC-3 | Light Cycling | Cycled | 65, 85 | <50% | MPP | No |
| ISOS-LC-1I | Light Cycling | Cycled | 25 / Ambient | Nitrogen | MPP or OC | Yes |
| ISOS-LC-2I | Light Cycling | Cycled | 65, 85 | Nitrogen | MPP or OC | Yes |
| Solar-Thermal Cycling (ISOS-LT) | ||||||
| ISOS-LT-1 | Solar-Thermal | Cycled | Cycled:RT to 65 | Ambient | MPP or OC | Yes |
| ISOS-LT-2 | Solar-Thermal | Cycled | Cycled:5 to 65 | 50% | MPP or OC | No |
| ISOS-LT-3 | Solar-Thermal | Cycled | Cycled:-25 to 65 | 50% | MPP or OC | No |
| ISOS-LT-1I | Solar-Thermal | Cycled | Cycled:RT to 65 | Nitrogen | MPP or OC | Yes |
| ISOS-LT-2I | Solar-Thermal | Cycled | Cycled:5 to 65 | Nitrogen | MPP or OC | No |
| ISOS-LT-3I | Solar-Thermal | Cycled | Cycled:-25 to 65 | Nitrogen | MPP or OC | No |
Litos Lite supports multiple ISOS protocols including ISOS-D (dark storage), ISOS-V (bias stress), ISOS-T (thermal cycling), ISOS-L (light soaking), ISOS-O (outdoor), ISOS-LC (light cycling), and ISOS-LT (solar-thermal cycling). Note that certain advanced protocols requiring environmental chambers or specific humidity levels may not be compatible without additional equipment.
ISOS Protocol Overview
ISOS protocols are internationally recognized procedures for evaluating the long-term stability of solar cells under real-world conditions. Whether you're running dark storage (ISOS-D), light soaking (ISOS-L), or bias stress (ISOS-V) tests, choosing the right equipment is critical. The table below shows exactly which ISOS protocols can be executed using Fluxim’s Litos Lite — a high-throughput platform designed for parallel JV and stability testing of organic, perovskite, and tandem solar cells.
About the ISOS Protocols
ISOS (International Summit on Organic Photovoltaic Stability) protocols are divided into categories based on the type of stress applied:
- ISOS-D (Dark Storage): Stability in the absence of light at ambient or elevated temperature.
- ISOS-V (Bias Stress): Samples under electrical bias to test charge-induced degradation.
- ISOS-T (Thermal Cycling): Simulates outdoor temperature swings.
- ISOS-L (Light Soaking): Exposure to constant illumination.
- ISOS-O (Outdoor Stability): Real-world exposure conditions.
- ISOS-LC (Light Cycling): Repeated light-dark cycles to stress encapsulation and materials.
- ISOS-LT (Solar-Thermal): Combines light and temperature cycling — the most demanding tests.
Do you want a deeper explanation of each protocol and how they relate to solar cell stability? Read our full guide: ISOS Protocols for Perovskite Stability Testing.
If your lab requires high-throughput, ISOS-compliant testing, get in touch with us today to see how Litos Lite can support your solar cell research.
Sample Heating stage to ensure Homogeneous heat.
The electrical connections to the sample are designed according to the customer requirements.
Manual probes to contact the single pixel and perform quick JV characterizations are also available.
Illumination - Solar Simulator or LED Array
Litos Lite is designed to work with different illumination sources. Fluxim can provide a ready-to-go solution with one of our chosen light sources. We can also integrate other solar simulators into the system (as a custom-made solution).
For efficiency measurements, the result can only be as good as the light source used. We teamed up with Wavelabs to integrate different solar simulators into our PV stability setup.
The Sinus 70 (5x5 cm2, A++AA+) and the Sinus 220 (16x16 cm2, A++A+A+) are state-of-the-art LED solar simulators. They can be controlled directly via the Litos Lite software. The user can easily tune both the light intensity and the spectrum. A PID controller is stabilizing the output of the solar simulator to assure that the aging experiments are not affected by the variation of the illumination.
These LED solar simulators can maintain a constant emission spectrum at a constant level over time by self-adjusting the output with an integrated photodiode and spectrometer. This is a major advantage over standard Xenon lamp simulators when you need to perform a stability analysis: the output of the solar simulator does not degrade during the experiment.
Moreover, the different LEDs can be controlled independently to define light outputs that are specific to selected experiments. The spectrum can be adapted to different standards (AM 1.5G or AM 0) automatically, without using an external filter.
We can also offer a simpler AAA, 16x16 cm2 solar simulator from Wavelabs called the Sinus 230.
The solution solution is an ideal light soaking setup that can provide reliable stability measurements on your perovskite and organic solar cells.
Software for Parallel JV and Stability Measurements
Litos Lite has professional, user-friendly software. This is one of the biggest assets of the instrument.
First, the user chooses their sample layout, sets device area, polarity, voltage, and current safety limits for each pixel, and can assign each pixel a tag (e.g. dead), which can then be used to select/deselect devices to measure. It is possible to save those for future use.
Switch between different sample layouts, construct recipes with multiple steps, and acquire data.
Analyze the results live within the software while stressing the different pixels.
Full control over the Wavelabs SINUS beyond AAA solar simulators. Other simulators can be integrated upon request.
Once the user starts the measurement, a dedicated window with a live view appears, where the progress of the measurement can be tracked. Simultaneously, the results are channeled to the main GUI, where data can be analyzed.
In this window, various parameters such as PCE, Jsc, Voc, FF, and hysteresis are automatically extracted for JV curves. Parameters are also extracted for techniques such as MPP tracking, constant voltage, and constant current. Alongside, the readings from all sensors are saved including temperature, light intensity, and light spectrum (for certain supported solar simulators).
In the results section the data can be plotted in various ways: logarithmic axes, per pixel area, or absolute or absolute/relative time. It is possible to plot devices side-by-side and compare them.
Once the user is ready, they can export the data to CSV format for plotting or further analysis. Naturally, the data can also be saved and loaded.
Finally, in the hardware manager, the user can take direct control of the hardware and read all sensors. For example, one can turn on/off the heater or solar simulator, as well as set the intensity of backlight illumination.
Download the Litos Lite Brochure
Once this is complete, the user can choose from one of the default measurement recipes, or design their own. Here, it is possible to program JV measurements, perform Maximum Power Point tracking, keep devices at constant current or voltage, change illumination, and control sample temperature. It is also possible to loop measurements or wait for specific conditions to be fulfilled (e.g. time elapsed or temperature reached). Finally, the user can sweep parameters such as light intensity, temperature, or scan speed (e.g. measure a series of JV curves at different temperatures). Even multi-dimensional sweeps are possible.
Frequently Asked Questions (FAQs)
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Litos Lite is designed for high-throughput JV and stability testing of perovskite, organic, and tandem solar cells. It supports ISOS protocols and enables researchers to stress and measure multiple devices in parallel.
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Litos Lite supports up to 56 devices for standard solar cells, 16 for tandem cells, 8 for high-current samples, or 4 mini-modules.
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Yes. Litos Lite supports ISOS-D, ISOS-V, ISOS-T, ISOS-L, ISOS-O, ISOS-LC, and ISOS-LT protocols. The table on this page outlines exact compatibility.
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Yes. The sample holder is glovebox-compatible, allowing researchers to load samples in an inert atmosphere before measurements.
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Yes. Each channel can independently track the Maximum Power Point (MPP) or be held at a constant voltage or current.
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Yes. Litos Lite includes a dedicated tandem sample holder and supports parallel measurement of up to 16 tandem cells.
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Litos Lite is compatible with external illumination sources, including Wavelabs Sinus 70/230 Solar Simulators or custom LED arrays.
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Yes. Litos Lite comes with Fluxim’s proprietary software for configuring stress/measurement routines, data acquisition, and visualization.
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You can contact us here to request a quote or arrange a virtual demo tailored to your research needs.
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Use an ISOS-compliant platform such as Litos Lite. Keep devices at Maximum Power Point, control temperature (25 °C – 85 °C), and flush the sample holder with dry nitrogen to prevent encapsulation-related degradation.
Litos Lite Video Tutorials and Demonstrations
Explore video tutorials, webinars, and shorts showcasing how to perform JV, MPP, ISOS stability tests, and more using Litos Lite.
Litos Lite Tutorials: Light JV & MPP Tracking
Learn how to perform parallel JV sweeps and MPP tracking on up to 56 devices with Litos Lite.
Perovskite-Silicon Tandem Solar Cells
Explore how tandem cells are pushing efficiency to 34.85%. Includes simulation insights using Setfos from Fluxim.
Stability Analysis Webinar
Learn how to apply ISOS protocols and evaluate solar cell stability. Includes best practices and examples using Litos Lite.
Advanced Upscaling of Perovskite Solar Cells
Explore simulation strategies to tackle module design challenges. Learn how Laoss helps optimize performance in large-area devices.
Temperature-Dependent JV Measurements
Dr. Antonio explains how to run temperature-controlled solar cell experiments with Litos Lite from 25°C to 85°C.
The Perovskite Solar Cell Race
Why stability is the key challenge—and how Litos Lite solves it. Explore parallel MPP tracking and environmental control features.