Thermal evaporation deposits clean, low-energy thin films by resistively heating a source material until it sublimes or vaporizes inside a high-vacuum chamber, then condensing it onto your substrate. It remains the workhorse PVD technique for laboratory deposition of metal contacts, hole/electron-transport layer dopants, top electrodes for perovskite and OLED stacks, and reference electrodes for battery research where line-of-sight, low-damage growth matters more than conformality.
Single-source systems are sufficient for routine metallization (Au, Ag, Al, Cr, Cu top contacts, lithium for half-cell counter-electrodes). Multi-source configurations open up co-evaporation and sequential layering without breaking vacuum, which is what enables alloy films, graded compositions, doped organics, and multi-layer device stacks. Typical workflows use a quartz crystal microbalance to monitor deposition rate per source, shutters to gate each pocket, and substrate rotation or planetary motion to even out thickness across the holder.
Compared with sputtering, thermal evaporation produces less substrate damage and lower film stress, making it the preferred choice for soft organics, halide perovskites, and thermally fragile interfaces. Compared with e-beam evaporation, it is simpler, cheaper to maintain, and free of x-ray exposure to the substrate, but is limited to materials with manageable vapor pressures at resistive-heater temperatures — refractory metals and most oxides belong on an e-beam or sputter tool instead.
Match the source count to your stack: one source for top contacts and simple metallization; two sources when you need to co-deposit a host and a dopant or alternate two layers without venting; four sources for full device stacks, alloy studies, or workflows that require a dedicated pocket per material to avoid cross-contamination. Sample-stage size sets the practical batch — pick a chamber whose holder comfortably exceeds your largest substrate so edge uniformity stays usable.
If you are building battery top electrodes or simple metal contacts, start with a single- or two-source unit; for organic electronics, perovskite top stacks, or alloy thin-film research, look at four-source tools. For oxide and refractory deposition see Electron Beam Evaporation; for higher-throughput metals and compounds see Sputtering; or browse the broader Vapor-Phase Synthesis family.
