💡Thermal Evaporator V1 Build (WIP)
Last updated
Last updated
After purchasing and receiving all parts outlined in the Evaporator Bill of Materials, follow the step-by-step process to assemble the vacuum chamber.
(i) Wrap an O-ring around each plate to ensure the chamber has a tight vacuum seal.
(ii) Screw in each plate with 8 bolts into the frame as shown in the following image.
Note: Plan where you want each plate to be (i.e. top, bottom, side) depending on your setup
Each opening must be covered and sealed for the vacuum to exist. Therefore, each opening needs a feedthrough in it or a blank flange to cover it. Ensure that each part has the correct dimension to properly fit in its corresponding port.
(i) Pair up the feedthrough/flange with its matching O-ring and clamp.
(ii) Layer the parts in the following order. Starting from the bottom closest to the plate place the O-ring, flange/feedthrough, and clamp. Then attach all necessary screws tightly. Repeat this process for all openings.
(i) Screw in the hinge into two adjacent plates where you want the door to be.
(ii) Attach knobs on opposite side of hinge to open and close the door securely.
(iii) Attach feet to the bottom of the chamber to minimize vibration.
Connect the turbo pump (Hi-Cube 80) to the KF-40 plate using the corresponding KF-40 flange and O-ring. Since the turbo pump has a lip that makes it difficult to tighten the screws, we recommend using hex shaped 10-32 x 5/8" screws and tightening with a wrench.
The Pfeiffer MPT 200 Gauge has a KF-25 connection port. To optimize the 6 plates we chose, an adapter from KF-25 to KF-16 is needed to connect the pressure gauge to the vacuum chamber. Attach using a KF-16 flange to the plate and a KF-25 clamp to connect the adapter to the pressure gauge.
Heating the vacuum chamber is necessary for two reasons. First, high temperatures of approximately 1200˚C are needed to evaporate the aluminum and perform the thermal evaporation process. Second, heating the chamber allows it to bakeout, meaning that the water trapped inside evaporates allowing the vacuum to achieve a lower pressure.
Our setup consists of two parts: the crucible and the substrate heater.
The crucible is comprised of the following parts:
After assembling these parts together, connect the copper power feedthroughs to either end of the tungsten filament using an inline barrel connector.
Ceramic beads can be used to safely insulate the metal and prevent electrical misconnections.
Next, connect a power supply to the external end of the power feedthroughs to heat up the crucible.
Finally, attach the thermal breakout board and arduino to the thermocouple to read the temperature values.
