Electroluminescence/Photoluminescence

CellSpot EL/PL

EL and/or PL on small to medium areas within a dark enclosure

The CellSpot system allows the user to image defects and non-uniformities in solar cells and minimodules without room light artifacts. 

CellSpot EL/PL
  • Full-Frame sensor camera for wide field of view and high resolution, modified for sensitivity to IR wavelengths. Includes power and data cables
  • Programmable EL/PL power supply, controlled by system software 
  • Switch box to switch between EL & PL 
  • Banana to alligator clip cables for EL 
  • BrightSource PL LED Lamp(s): 
  • One lamp is standard (green or red) 
  • Enclosure can fit up to four lamps 
  • Lamps include a heatsink, cooling fan, and thermal safety switch 
  • Dark Enclosure with baseplate and mounting posts for camera, lamps 
  • Interface box with managed USB hub for robust device control 
  • IMPEL software on a Windows laptop 
  • No-charge software upgrades and usage assistance for two years 
  • Training includes manual and videos, plus a no-charge online training session 
  • OPTIONAL: Si cell EL Probing Station (chuck), customizable 
  • OPTIONAL: Sinking power supply for quantitative mapping 
  • OPTIONAL: Multi-position, software actuated Filter Wheel

Camera: 

  • Resolution: 24.3 MP 
  • Lens: 35 mm
  • Filters: Customizable longpass and bandpass wavelengths available 

Standard Power Supply:

  • Input Voltage Range: 100-120V AC 60 Hz or 220-240V AC 50 Hz 
  • Output: Up to 3A or 5A, 60V DC 
  • PL Lamps: 
  • 100W green or red LED 
  • Variable intensity up to 1/3 Sun each 

Enclosure: 

  • Exterior: 51 cm x 43 cm x 63 cm 
  • Maximum image area: 50 cm x 33 cm 
  • Optional EL Probing Station: 
  • 16 bus bars maximum  230 x 230 mm maximum cell size 

Laptop Computer: 

  • Processor: AMD Ryzen 5 8645HS 
  • Storage: 512 GB 
  • Screen Size: 16 in. 

Total System Weight: 

  • Standard Configuration: 36 kg 
  • Fully Optioned: 57 kg

Non Destructive Imaging

BrightSpot integrates hardware components (specialized camera, EL/PL power supply, PL Lamps, and optional filter wheel) with its IMPEL software for device control as well as image capture and processing. Recipes make it easy to replicate camera and power supply parameters as well as image contrast enhancement and cropping.

Features

1-6 Photoluminescence Light Sources

1-6 Photoluminescence Light Sources

Power Supply for Light Sources or EL biasing​

Power Supply for Light Sources or EL biasing​

EL-PL Camera with Filters​

EL-PL Camera with Filters​

LEDs Filtered To Remove IR “Noise”

EL chuck for cells with up to 16 busbars

Full-area LED illumination – No safety risks from lasers or damage to cells

Laptop with IMPEL software

Laptop with IMPEL software

EL chuck for cells with up to 16 busbars​

EL chuck for cells with up to 16 busbars​

Switch box between forward/reverse bias

Switch box between forward/reverse bias

Configurations capable of reaching 1 Sun intensity​

PL for Samples up to
40cm x 30cm​​

Bigger Than Our Box? Let’s Customize.

See our Custom EL/PL Solutions for any shape/size/orientation application

After diffusion

After selective emitter

After rear passivation

After front passivation

Finished PERC cell

Finished IBC cell

Need a Custom Solution?

Whether you’re testing next-gen tandem cells, working in a space-rated clean room, or need custom optics for your line, we can help. BrightSpot has built custom EL, PL, and UVF systems for some of the most demanding PV applications on Earth—and in orbit.

Contact us and discuss your needs with one of our experts.

Custom Solution

PL Applications

Uses safe green or red LED light sources and a high resolution PL camera within a lightproof enclosure, to obtain contactless images of partially and fully processed cells and minimodules; Non-contact PL imaging can even be applied to partially processed cells, while comparing EL to PL images allows the user to differentiate between series-resistance and bulk/surface quality effects.

Partially Processed Cell

Fully Processed
Cell

EL Applications ​

Inject current via clipping to wires, probing pads, chuck busbar probing, or multiplexed probing of arrays of thin-film cells

Inactive Cracked Segments

Reverse bias EL shunt map

Chuck EL PERC

CdTe

CIGS

perovskites

SunFlex Solar is developing a new architecture for solar cell interconnections, and BrightSpot's EL/PL system has been central to our R&D efforts. The automated image processing, recipe creation, focus assists and live-view features make this tool extremely efficient for batch processing and trustworthy for process monitoring over time.

Kate Fisher

Co-Founder SunFlex Solar

SunFlex Logo

Download Product Brochure

Download the product brochure to get all the info and specs

IMPEL Software

Control

IMPEL is the unified control platform for BrightSpot imaging systems, enabling seamless coordination of camera, light sources, and power supply. From a single interface, users can adjust exposure settings, trigger PL or EL sequences, and automate capture workflows across multiple system components.

Enhancement

Built-in image processing tools help users sharpen contrast, highlight defects, and visualize subtle variations in cell or panel performance. With support for custom filters and multispectral imaging, IMPEL ensures every captured frame delivers actionable insights, whether in R&D or field diagnostics.

Report

IMPEL simplifies documentation by generating detailed reports with embedded images, metadata, and measurement context. Export results for internal QA, client acceptance, or long-term traceability – standardized and ready to share.

IMPEL Software
IMPEL Software Preview

Publications

Here you’ll find white papers, case studies, and expert commentary designed to provide practical takeaways for professionals and decision-makers

Customized Defect Imaging Solutions for Perovskite and Tandem Cell/Panel Architectures

UV Fluorescence Imaging Of Defects And Bill Of Materials Variations In Bifacial Solar Panels

EUPVSEC – Bilbao, Spain – Sep 22, 2025

Ultraviolet Fluorescence Imaging for Photovoltaic Module Metrology: Best Practices and Survey of Features Observed in Fielded Modules

IEEE Journal of Photovoltaics ( Volume: 15, Issue: 3, May 2025)

Low-Cost Daytime Electroluminescence Imaging

NREL PV Reliability Workshop – Lakewood, CO USA – Mar 6, 2025

UV Fluorescence Imaging for Solar Panel Product Development and Durability Testing

NREL PV Reliability Workshop – Lakewood, CO USA – Feb 28, 2024

Unveiling the Unseen: Harnessing UV Fluorescence for Comprehensive Rooftop PV System Assessment and Successful Insurance Claims Process

NREL PV Reliability Workshop – Lakewood, CO USA – Feb 28, 2024

Detection and Impact of Cracks Hidden Near Interconnect Wires in Silicon Solar Cells

50th IEEE PVSC, Jun 12 2023