TCO AO14 by AGC Solar is solar glass coating designed thin film photovoltaic modules.

AO14 (TCO)

TCO Coated glass for thin film applications (a-Si)

Type

 

TCO coated clear float glass

Coating

Barrier layer

SiO2 based

Conductive coating

SnO2:F based

Deposition

CVD

Applications

 

Front glass for thin film

 

 

photovoltaic modules

(amorphous silicon)

 

AO14 is a clear float glass, coated with Transparent Conductive Oxide (TCO). The right balance between transmission, haze and conductibility of the TCO coating enables for improving the thin film cell efficiency.
Indeed, when rightly deposited, the TCO has the potential

• to lower the reflection at the interface with the absorber;
• to increase the path of light into the absorber;
• to trap the light into the absorber.

Combined with the excellent durability of glass, AO14 is the product of choice for thin film photovoltaic modules (amorphous silicon).
AO14 conforms to EN572 and is fully temperable.

MAIN CHARACTERISTICS

Transmission (%)

79

Average between 400 and 1000nm

Transmission measured with index matching liquid CH2I2 (haze compensation) on 3.2mm (1/8”) glass.

AGC can help evaluating these values according to other standards and/or to the specificities of the final application.

Resistivity (Ohms per square)

14

4-points method

Haze (%)

>10

Hazeguard, illuminant C, 2° (Standard D1003-95)

Specific weight (kg/m²)

8

For 3.2mm (1/8”) glass

Processing conditions

Annealed, toughened or tempered EN12150

 

MECHANICAL CHARACTERISTICS

Mechanical strength (MPa)

40

Annealed

 

70

Toughened

 

120

Tempered, EN12150

Young modulus (GPa)

70

EN572

Poisson ratio

0.2

EN572

Hardness

Moh (scratch hardness)

6

EN572

 

Knoop (identation hardness)

470

Indenter load 500g

Density (kg/m³)

2500

EN572, at 18°C

 

THERMAL CHARACTERISTICS

Hemispherical emissivity

0.84 Uncoated side

Between -18°C and 66°C

 

0.17 Coated side

Between -18°C and 66°C

Expansion coefficient (10-6 1/K)

9

EN572, between 20°C and 300°C

Specific heat (J/kg/K)

720

EN572

Thermal conductivity (W/m/K)

1

EN572

Softening point (°C)

722

Annealing point (°C)

552

Strain point (°C)

500

 

GLASS CHEMICAL COMPOSITION

Silicon dioxide (SiO2, %)

69 to 74

EN572

Sodium oxide (NaO, %)

12 to 16

EN572

Calcium oxide (CaO, %)

5 to 12

EN572

Magnesium oxide (MgO, %)

0 to 6

EN572

Aluminum oxide (Al2O3, %)

0 to 3

EN572

Trace elements (FeO, etc., %)

<1