Custom FTO Conductive Glass Substrates (Fluorine-Doped Tin Oxide)
High Thermal Stability (>500°C) | Tunable Sheet Resistance (7 / 10 / 14 Ohm/sq) | Thicknesses: 1.1mm, 1.6mm, 2.2mm | Custom Sizes, Laser Scribing & Edge Chamfering
1. Product Overview & Key Value
Our Custom FTO Conductive Glass Substrates (Fluorine-Doped Tin Oxide Coated Glass) are the industry standard for high-temperature optoelectronic and electrochemical device fabrication. Fabricated via advanced atmospheric pressure chemical vapor deposition (APCVD), our FTO thin film is chemically bonded to optical float glass, providing unmatched thermal endurance, chemical corrosion resistance, and mechanical abrasion durability.
Unlike ITO glass (which degrades above 300°C–350°C), FTO conductive glass easily withstands continuous high-temperature sintering and annealing up to 500°C–550°C in air without loss of electrical conductivity. Available in standard thicknesses of 1.1mm, 1.6mm, and 2.2mm with sheet resistances of 7 Ohm/sq, 10 Ohm/sq, and 14 Ohm/sq, we offer turnkey custom slicing, precision CNC cutting, laser etching, and custom packaging for academic laboratories and industrial PV pilot lines.
2. Core Advantages & Technical Highlights
Exceptional High-Temperature Stability: Endures continuous thermal processing up to 500°C–550°C without film oxidation, sheet resistance deterioration, or transmittance drop.
Low Sheet Resistance & High Conductivity: Available in calibrated 7 Ohm/sq, 10 Ohm/sq, and 14 Ohm/sq to optimize current collection efficiency and minimize series resistance.
High Optical Transmittance & Light Scattering: Delivers visible light transmittance of >= 80% to 84% (at 550nm) with a natural microscopic textured surface (haze) that enhances optical path length and light trapping for solar cells.
Robust Chemical & Physical Durability: Superior resistance to strong acids, alkali electrolytes, and mechanical scratching compared to other TCO coatings.
Standard & Custom Thickness Selection: Available in 1.1mm (lightweight/lab standard), 1.6mm (balanced), and 2.2mm (heavy-duty/rigid) substrates.
Full Custom Fabrication: CNC precision cutting, safety chamfered edges, ultrasonic cleanroom washing, and custom laser scribing (P1/P2/P3 lines).
3. Technical Specifications Table
| Parameter / Property | Engineering Capability & Specifications |
| Product Name | Custom FTO Conductive Glass / Fluorine-Doped Tin Oxide Glass |
| Standard Thickness Options | 1.1 mm (+/- 0.05 mm) | 1.6 mm (+/- 0.05 mm) | 2.2 mm (+/- 0.08 mm) |
| Available Sheet Resistance | • 7 Ohm/sq (6–8 Ohm/sq: Ultra-low resistance for high-efficiency solar cells)
• 10 Ohm/sq (9–11 Ohm/sq: Balanced conductivity & optical clarity)
• 14 Ohm/sq (13–15 Ohm/sq: High optical transmission standard) |
| Optical Transmittance | >= 80% – 84% (@ 550 nm) / Integrated Visible Transmittance >= 82% |
| Thermal Resistance | Continuous service up to 500°C – 550°C (Air / Inert atmosphere) |
| Substrate Material | High-Purity Float Glass / Passivated Soda-Lime Glass with SiO2 Barrier Layer |
| Haze (Light Scattering) | 5% – 15% (Enhanced photon trapping for photovoltaic absorption) |
| Surface Roughness (RMS / Ra) | RMS ~ 10–25 nm (Micro-pyramidal texture providing strong active-layer mechanical interlocking) |
| Dimensional Limits | Min: 5 mm x 5 mm | Max: 600 mm x 800 mm (Custom sizes per CAD / DXF) |
| Cutting & Sizing Tolerance | +/- 0.05 mm to +/- 0.15 mm (High-precision laser dicing / CNC diamond cutting) |
| Patterning & Scribing | UV / Fiber Laser Scribing (Resolution down to 20 um), Wet Chemical Acid Etching |
| Edge & Corner Quality | Safety Arris Chamfer (45° micro-bevel), CNC Flat Polished Edge, 2.5D C-edge |
| Electrode & Contact Options | Sintered silver paste busbars, conductive copper foil tape, ultrasonic solder leads |
4. FTO Glass vs. ITO Glass: Key Comparison
| Feature / Metric | FTO Glass (SnO2:F) | ITO Glass (In2O3:Sn) |
| Max Working Temperature | 500°C – 550°C (High thermal stability) | 300°C – 350°C (Conductivity drops above 350°C) |
| Surface Morphology | Micro-textured / Pyramidal (Haze helps light trapping) | Ultra-smooth (Ra < 1.5 nm, ideal for OLEDs) |
| Chemical Durability | Extremely high (Resistant to acids, alkalis & plasma) | Moderate (Easily etched by weak acids) |
| Visible Transmittance | 80% – 84% (Slightly diffused) | 84% – 88% (Crystal clear) |
| Primary Applications | Perovskites (with TiO2 sintering), DSSCs, Electrocatalysis | Micro-OLED, QLED, Touch Screens, Transparent Heaters |
| Cost / Raw Materials | Cost-effective (Abundant tin-based compound) | Higher cost (Indium is a rare earth metal) |
5. Typical Applications & Use Cases
Perovskite Solar Cells (PSCs) & Tandem Photovoltaics: Ideal transparent anode substrate for high-temperature mesoporous TiO2 layer annealing (>450°C) without electrical degradation.
Dye-Sensitized Solar Cells (DSSCs): Standard working and counter electrode substrate supporting high-temperature paste sintering and volatile triiodide electrolyte contact.
Photoelectrochemical (PEC) Water Splitting & Electrocatalysis: Working electrodes for oxygen evolution reactions (OER), hydrogen evolution reactions (HER), and CO2 electroreduction.
Electrochromic Smart Windows & Displays: Durable transparent electrode layer for multi-layer metal oxide film deposition (WO3 / NiO).
Photocatalysis & Environmental Testing: Transparent conductive platform for photocatalytic degradation studies under UV-Visible illumination.
De-icing & High-Temperature Heaters: Industrial transparent heating elements operating in high-heat or chemically aggressive environments.
6. Frequently Asked Questions (FAQ)
Q1: Why should I choose FTO glass instead of ITO glass for solar cells and electrocatalysis? A: If your device fabrication involves high-temperature annealing (such as sintering compact or mesoporous TiO2 at 450°C–500°C), FTO glass is required. ITO glass degrades rapidly above 300°C–350°C, losing both its conductivity and transparency. Furthermore, FTO offers superior chemical stability in acidic/alkaline electrolytes during electrocatalysis experiments.
Q2: What is the practical difference between 7 Ohm, 10 Ohm, and 14 Ohm sheet resistance?
A:
7 Ohm/sq: Thickest FTO coating, offering lowest series resistance ($R_s$) and highest current collection—ideal for larger-area solar cells and high-current electrochemical devices.
10 Ohm/sq: The optimal all-round balance between electrical conductivity and optical transparency for laboratory research.
14 Ohm/sq: Thinnest FTO film offering the highest visible light transmittance (>= 83%–84%), suited for devices where optical transmission takes priority over high current handling.
Q3: Which thickness should I select: 1.1mm, 1.6mm, or 2.2mm?
A:
1.1mm: The universal standard for university laboratory spin-coating, fitting standard test fixtures and minimizing device weight and thickness.
1.6mm: Excellent compromise offering enhanced mechanical rigidity without adding excessive thickness.
2.2mm: Heavy-duty substrate providing maximum flatness, structural strength, and resistance to thermal-shock cracking during rapid heating/cooling cycles.
Q4: Can FTO glass be cut or patterned into custom sizes? A: Yes. We provide pre-cut standard laboratory formats (e.g., 15x15mm, 20x20mm, 25x25mm, 50x50mm, 75x25mm slides) as well as full custom CNC/laser cutting according to your CAD drawings. We also offer precision laser scribing to create isolated electrode tracks and sub-cell patterns.
Q5: How do I identify the conductive side of FTO glass?
A: Touch the two probes of a digital multimeter (set to resistance/continuity mode) onto the glass surface about 1 cm apart. The side showing a low resistance reading (e.g., 7–20 Ohms) is the FTO coated conductive side; the non-coated bare glass side will show an open circuit (“OL”).
Q6: What is the recommended cleaning protocol for FTO glass before thin-film coating?
A:
Ultrasonic cleaning in mild detergent / Deionized (DI) water (15 min).
Ultrasonic cleaning in Acetone (15 min) to remove organic residues.
Ultrasonic cleaning in Isopropanol (IPA) or Ethanol (15 min).
Rinse with DI water and blow-dry with high-purity Nitrogen ($N_2$) gas.
(Optional) UV-Ozone or air plasma treatment for 10–15 min prior to active layer deposition.
7. Cleanroom Packaging & Export Protection
Class 1000 Cleanroom Processing: Ultrasonically cleaned with deionized water and packaged in dust-free cleanroom environments.
Wafer / Substrate Slot Boxes: Small-format laboratory chips are packed in dust-proof slotted substrate cassettes or individual vacuum carrier boxes to eliminate surface friction and edge chipping.
Interleaving & Vacuum Barrier: Large plates are interleaved with optical-grade paper/film, vacuum sealed in moisture-proof foil bags, and packed with high-density EPE foam.
Drop-Tested Crates: Shipped in reinforced heavy-duty export cartons and wooden crates for 100% damage-free global delivery.
Need a Custom FTO Glass Solution for Your Research or Production?
Upload your CAD drawing or specify your dimensions, thickness (1.1mm / 1.6mm / 2.2mm), and target sheet resistance (7 / 10 / 14 Ohm/sq). Our materials engineers will review your request and provide a detailed quote within 24 hours.
[ Request a Custom Quote / Free Sample ] [ Download Technical Datasheet ]
