Solar cell diffusion furnaces

Selection considerations

Where diffusion sits in the cell line

A diffusion furnace forms the junction or doped layer that turns a textured wafer into the base of a working cell. Wafers arrive from texturing equipment and go on to the next steps of cell production: selective emitter work on laser doping tools, passivation and contact layers on deposition systems, then printing and firing on metallization equipment. On TOPCon routes, a tube tool such as NAURA's LPCVD system or its tube PECVD system often follows, so the furnace recipe and the downstream deposition recipe should be planned together by one process owner.

Vertical or horizontal: the two NAURA furnaces listed here

Both furnaces in this class come from NAURA. The VERIS vertical diffusion furnace stands its tube upright, loads wafers vertically, takes less floor space and lets technicians service it from floor level. NAURA positions it for boron and phosphorus diffusion plus annealing on high-efficiency lines. The HORIS D12 horizontal furnace is a multi-zone tube family that covers doping, oxide growth and annealing, with several dopant inlets and automatic waste collection.

The practical choice comes down to your building and your staff. A vertical tool changes how wafers travel into the tube, so ask NAURA to show the vertical handling path and the link to your MES. A horizontal tool may fit an existing line layout more easily; ask which hot steps you will actually run on it and how source handling changes between them. If you plan to move between PERC, TOPCon or other routes later, the guide on cell technology compatibility lists what to get confirmed for each route. Gas cabinets, exhaust scrubbing and cooling are a large share of site work for any furnace; the utilities and installation guide helps you list them before the layout is frozen.

Consumables and wafer transport around the tube

Furnace output depends on more than the tube. Boats, paddles and liners wear and get replaced, so price them alongside the machine. Browse process quartz parts, for example the square insert quartz boat from Hongsheng Quartz, and process ceramic parts for high-temperature fixtures. Ask the furnace maker which boat designs it has run, and get the replacement interval written next to the boat drawing.

Plan the transfer of wafers between carriers, boats and the next tool with cell material handling in mind. Breakage at the loading station counts against output just as much as a poor diffusion result does, so include loading and unloading in the trial you run before acceptance. Our notes on factory and site acceptance trials explain dividing that trial between the maker's floor and yours.

Plan the equipment scope

For solar cell diffusion furnaces, begin your enquiry with wafer size, intended diffusion step and batch arrangement. Request a configuration-specific quotation and agree on temperature control, process gases, handling interfaces and the agreed uniformity test. Each listing shows the published values and the questions to confirm.

Read equipment buying guides or prepare a sourcing brief.