Sectors · Solar
How a solar module is made
A solar module is a sheet of silicon cells laminated between glass and a backsheet, framed in aluminum, with a junction box on the back. Each part has its own makers, and the cells have a chain of their own behind them: wafers, polysilicon, metallurgical silicon, quartz.
The rules that decide whether a module earns a tax credit look at who owns each of those makers, not just the brand on the frame. One part from the wrong owner can change the answer for the whole project.
Open the solar mapThe parts, opened up
Drag to turn · click a part
- 1FrameAn extruded aluminum frame holds the laminate rigid and gives the module its mounting edge.30 makers
- 2Cover glassLow-iron tempered glass on the front lets light through and takes the weather.48 makers
- 3EncapsulantPolymer sheets above and below the cells, melted in the laminator, seal them against moisture.69 makers
- 4CellsWafers turned into cells, where light becomes current. The part the rules care most about.88 makers
- 5Ribbon and interconnectTinned copper ribbon strings the cells together and carries the current to the edge.26 makers
- 6BacksheetThe polymer sheet on the back insulates the module and keeps moisture out.39 makers
- 7Junction boxThe box on the back where the strings meet the cables, with bypass diodes inside.78 makers
- 8Assembled moduleGlass, encapsulant, cells, backsheet and frame laminated and framed into the finished module.226 makers
The whole chain, step by step
Ends inModule AssemblyInverters & Power ElectronicsTrackers & RackingInstallation
Switching a variant shows the upstream steps unique to that module technology and hides the ones that don't apply. One shared graph, filtered. Links are shareable.
Raw material: the trail reaches the ground Not traced yet: there is more upstream
Raw Extraction
Quartz & Silica Mining
raw materialHigh-purity quartz and silica sand are extracted from deposits. Quartz feeds the silicon chain; silica sand also feeds glass production.
Silver Mining
raw materialPrimary and by-product silver mining. Silver is essential to solar cell metallization paste (~10% of global silver demand).
Soda Ash Production
not traced yetSoda ash (sodium carbonate) is mined (trona) or synthesized (Solvay process); a key flux in flat-glass manufacturing for solar cover glass.
Intermediate Processing
Metallurgical Silicon
Quartz is reduced with carbon in submerged arc furnaces to produce metallurgical-grade silicon (~98% purity).
Polysilicon Refining
MG-Si is purified to solar-grade polysilicon (>99.9999%) via Siemens process or fluidized bed reactor.
Silver Refining
Mined silver is refined into high-purity silver powder and flake.
Silver Paste & Metallization
Refined silver is formulated into conductive pastes used to screen-print electrodes on solar cells. Critical bottleneck material.
Core Components
Quartz Crucibles
High-purity quartz fused into crucibles used to grow monocrystalline silicon ingots. Consumable per ingot pull.
Ingot Growth & Wafer Cutting
Polysilicon is melted and grown into monocrystalline or multicrystalline ingots, then sliced into thin wafers via diamond wire saws.
Solar Cover Glass
Low-iron, AR-coated patterned cover glass for the front of the module — melted from high-purity silica sand with soda-ash flux.
Encapsulants
not traced yetEVA and POE encapsulant sheets that laminate and insulate the cells between glass and backsheet.
Backsheets
not traced yetPolymer backsheets (Tedlar / PVDF / PET) that protect and electrically insulate the rear of the module.
Aluminum Frames
not traced yetAnodized aluminum frames that give the laminate mechanical rigidity and a mounting edge.
Junction Boxes
not traced yetJunction boxes with bypass diodes and cable terminations; combiner and enclosure variants for module and string wiring.
Ribbon & Interconnect
not traced yetTinned-copper ribbon and interconnect wire that series-connect cells into strings.
Thin-Film Absorber Materials
not traced yetCdTe and CIGS absorber materials for thin-film modules.
Cell Fabrication
Solar Cell Fabrication
Wafers are doped, textured, passivated, and screen-printed into photovoltaic cells.
Module & BOS
Module Assembly
Cells are strung, laminated between glass and backsheet with encapsulant, framed, and fitted with a junction box.
Inverters & Power Electronics
not traced yetConvert DC from the array into grid-quality AC. Strings, centrals, microinverters, hybrid solar+storage inverters, DC optimizers.
Trackers & Racking
not traced yetSingle- or dual-axis trackers and fixed-tilt racking — the steel and aluminum structures mounting modules to the ground or roof.
Installation
Site preparation, mechanical mounting, and electrical interconnection that deliver installed capacity.
MV Transformers
not traced yetMedium-voltage step-up transformers that connect the plant to the grid. Plant-level balance-of-system; feeds installation.
Plant Controls
not traced yetPlant-level controls: power plant controllers (PPC), BMS/EMS, and SCADA that coordinate the array. Feeds installation.