Copper (Cu) Pellets Overview
We sell these pellets and pieces by unit weight for evaporation use in deposition processes. These approximate materials prices are published to provide budgetary guidelines. Actual prices can vary and may be higher or lower, as determined by availability and market fluctuations. To speak to someone directly about current pricing, please click here .
Copper (Cu) General Information
Copper is one of the most highly utilized elements in the world with evidence of its usage found during ancient times. It is reddish-orange in color with a melting point of 1,083°C, a density of 8.92 g/cc, and a vapor pressure of 10-4 Torr at 1,017°C. Two of the most popular alloys in the world, brass and bronze, contain copper. It is known to be an excellent conductor of heat and electricity and can be found in wire, coins, and electromagnets. The vacuum industry relies heavily on copper material for backing plates which are bonded to sputtering targets. Copper, along with its alloys and compounds, are evaporated under vacuum to form layers in the manufacture of semiconductors, sensors, and circuit devices.
Copper (Cu) Specifications
Material Type | Copper |
Symbol | Cu |
Atomic Weight | 63.546 |
Atomic Number | 29 |
Color/Appearance | Copper, Metallic |
Thermal Conductivity | 400 W/m.K |
Melting Point (°C) | 1,083 |
Coefficient of Thermal Expansion | 16.5 x 10-6/K |
Theoretical Density (g/cc) | 8.92 |
Z Ratio | 0.437 |
E-Beam | Excellent |
Thermal Evaporation Techniques |
Boat: Mo, W Coil: W Basket: W Crucible: Al2O3, Mo, Ta |
E-Beam Crucible Liner Material | Graphite, Molybdenum |
Temp. (°C) for Given Vap. Press. (Torr) |
10-8: 727 10-6: 857 10-4: 1,017 |
Comments | Adhesion poor. Use interlayer (Cr). Evaporates using any source material. |
Suggested QCM Crystal | Alloy Crystal: 750-1002-G10**** |
**** Suggestion based on previous experience but could vary by process. Contact local KJLC Sales Manager for further information
Empirical Determination of Z-Factor
Unfortunately, Z Factor and Shear Modulus are not readily available for many materials. In this case, the Z-Factor can also be determined empirically using the following method:
- Deposit material until Crystal Life is near 50%, or near the end of life, whichever is sooner.
- Place a new substrate adjacent to the used quartz sensor.
- Set QCM Density to the calibrated value; Tooling to 100%
- Zero thickness
- Deposit approximately 1000 to 5000 A of material on the substrate.
- Use a profilometer or interferometer to measure the actual substrate film thickness.
- Adjust the Z Factor of the instrument until the correct thickness reading is shown.
Another alternative is to change crystals frequently and ignore the error. The graph below shows the % Error in Rate/Thickness from using the wrong Z Factor. For a crystal with 90% life, the error is negligible for even large errors in the programmed versus actual Z Factor.
Thermal Evaporation of Copper (Cu)
Copper can be thermally evaporated from a tungsten or molybdenum boat. We would recommend our EVS8B005MO or EVS8B005W if you are using a KJLC© system. A tungsten basket such as EVB43030W or EVB4060W may also be used.
Another option is to use a shielded, tantalum crucible heater with an alumina crucible such as our EVCH1 or EVCH10 with EVC9AO if using a KJLC system. Great care must be taken when installing the heater to prevent the outer shields from becoming warped which can cause a short in the heater, causing the welded joints to fail. The heater should be centered between the contacts and the outer shielding must be clear of the leads. Crucibles should be stored in a cool, dry place and always handled with gloves or forceps.
E-beam Evaporation of Copper (Cu)
Copper is rated as 'excellent' for e-beam evaporation. We recommend using either a graphite or molybdenum crucible liner.
A key process note is to consider the fill volume of the crucible liner. We find that the melt level of a material in the crucible directly affects the success of the crucible liner. Overfilling the crucible will cause the material to spill over and create an electrical short between the liner and the hearth. The outcome is cracking in the crucible liner. This is the most common cause of crucible liner failure. Placing too little material in the liner or evaporating too much material before refilling can be detrimental to the process as well. When the melt level is below 30%, the e-beam is likely to strike the bottom or walls of the crucible which immediately results in breakage. Our recommendation is to fill the crucible between 2/3 and 3/4 full to prevent these difficulties.
Crucible liners should be stored in a cool, dry place and always handled with gloves or forceps.
See highlighted results that match your result in the table below.
Ordering Table
Material | Description | Size | Quantity | Purity | Part Number | Price | In Stock | Add To Cart | |
---|---|---|---|---|---|---|---|---|---|
Material | Description | Size | Quantity | Purity | Part Number | Price | In Stock | Add To Cart | |
Copper |
COPPER PELLETS, |
1/4" Dia. x 1/2" Length | 1 lb. | 99.99% | EVMCU40QXH | $73.00 | |||
Copper |
COPPER PELLETS, |
1/4" Dia. x 1/2" Length | 1 lb. | 99.999% | EVMCU50QXH | P.O.R. | |||
Copper |
COPPER PELLETS, |
1/4" Dia. x 1/4" Length | 1 lb. | 99.99% | EVMCU40QXQ | $118.00 | |||
Copper |
COPPER PELLETS, |
1/4" Dia. x 1/4" Length | 25 g | 99.99% | EVMCU40QXQA | $40.00 | |||
Copper |
COPPER PELLETS, |
1/4" Dia. x 1/4" Length | 50 g | 99.99% | EVMCU40QXQB | $44.00 | |||
Copper |
COPPER PELLETS, |
1/4" Dia. x 1/4" Length | 100 g | 99.99% | EVMCU40QXQD | $55.00 | |||
Copper |
COPPER PELLETS, |
1/4" Dia. x 1/4" Length | 250 g | 99.99% | EVMCU40QXQJ | $88.00 | |||
Copper |
COPPER PELLETS, |
1/4" Dia. x 1/4" Length | 1 kg | 99.99% | EVMCU40QXQKG | P.O.R. | |||
Copper |
COPPER PELLETS, |
1/4" Dia. x 1/4" Length | 500 g | 99.99% | EVMCU40QXQT | P.O.R. | |||
Copper |
COPPER PELLETS, |
1/4" Dia. x 1/4" Length | 1 lb. | 99.999% | EVMCU50QXQ | $315.00 | |||
Copper |
COPPER PELLETS, |
1/4" Dia. x 1/4" Length | 25 g | 99.999% | EVMCU50QXQA | $44.00 | |||
Copper |
COPPER PELLETS, |
1/4" Dia. x 1/4" Length | 50 g | 99.999% | EVMCU50QXQB | $69.00 | |||
Copper |
COPPER PELLETS, |
1/4" Dia. x 1/4" Length | 100 g | 99.999% | EVMCU50QXQD | $96.00 | |||
Copper |
COPPER PELLETS, |
1/4" Dia. x 1/4" Length | 250 g | 99.999% | EVMCU50QXQJ | $205.00 | |||
Copper |
COPPER PELLETS, |
1/4" Dia. x 1/4" Length | 1 kg | 99.999% | EVMCU50QXQKG | P.O.R. | |||
Copper |
COPPER PELLETS, |
1/8" Dia. x 1/4" Length | 1 lb. | 99.99% | EVMCU40EXQ | $167.00 | |||
Copper |
COPPER PELLETS, |
1/8" Dia. x 1/4" Length | 1 kg | 99.99% | EVMCU40EXQKG | $409.00 | |||
Copper |
COPPER PELLETS, |
1/8" Dia. x 1/8" Length | 1 lb. | 99.99% | EVMCU40EXE | $344.00 | |||
Copper |
COPPER PELLETS, |
1/8" Dia. x 1/8" Length | 25 g | 99.99% | EVMCU40EXEA | $41.00 | |||
Copper |
COPPER PELLETS, |
1/8" Dia. x 1/8" Length | 50 g | 99.99% | EVMCU40EXEB | $60.00 | |||
Copper |
COPPER PELLETS, |
1/8" Dia. x 1/8" Length | 100 g | 99.99% | EVMCU40EXED | $98.00 | |||
Copper |
COPPER PELLETS, |
1/8" Dia. x 1/8" Length | 250 g | 99.99% | EVMCU40EXEJ | $233.00 | |||
Copper |
COPPER PELLETS, |
1/8" Dia. x 1/8" Length | 1 kg | 99.99% | EVMCU40EXEKG | P.O.R. | |||
Copper |
COPPER PELLETS, |
1/8" Dia. x 1/8" Length | 500 g | 99.99% | EVMCU40EXET | P.O.R. | |||
Copper |
COPPER PELLETS, |
1/8" Dia. x 1/8" Length | 1 lb. | 99.999% | EVMCU50EXE | $693.00 | |||
Copper |
COPPER PELLETS, |
1/8" Dia. x 1/8" Length | 25 g | 99.999% | EVMCU50EXEA | $62.00 | |||
Copper |
COPPER PELLETS, |
1/8" Dia. x 1/8" Length | 50 g | 99.999% | EVMCU50EXEB | $112.00 | |||
Copper |
COPPER PELLETS, |
1/8" Dia. x 1/8" Length | 100 g | 99.999% | EVMCU50EXED | $210.00 | |||
Copper |
COPPER PELLETS, |
1/8" Dia. x 1/8" Length | 250 g | 99.999% | EVMCU50EXEJ | $498.00 | |||
Copper |
COPPER PELLETS, |
1/8" Dia. x 1/8" Length | 1 kg | 99.999% | EVMCU50EXEKG | P.O.R. |