what metals are used in solar panels

June 28, 2026

Short answer:
The main metals used in today’s solar panels are aluminum, copper, silver, zinc, and various steel alloys, plus small amounts of specialty metals like indium, gallium, selenium, and tellurium in some panel types.

What Metals Are Used in Solar Panels?

Quick Scoop

If you sliced open a modern rooftop solar panel, you’d mostly find glass and silicon, but the parts that carry electricity and hold everything together are metals. These metals affect efficiency, cost, and how easy panels are to recycle.

Here’s the metal cast behind your clean energy:

Aluminum (frames and mounts)

Steel (support racks and some frames)

Copper (wiring and connections)

Silver (high‑efficiency electrical contacts)

Zinc (coatings, galvanizing, and some cell layers)

Trace or specialty metals: indium, gallium, selenium, tellurium, cadmium, tin, nickel, molybdenum, and lead (mainly in thin‑film or specific technologies)

Core Structure Metals

Aluminum: The Lightweight Workhorse

Forms most panel frames and many roof mounting rails.

Chosen because it’s light, corrosion‑resistant, fairly strong, and easy to recycle.

Sometimes used in certain wiring and grounding components thanks to its conductivity.

Steel: Heavy‑Duty Support

Steel (usually galvanized) is widely used for ground mounts and some large‑scale solar farm racks where maximum strength is needed.

Steel frames can support larger or heavier panels than aluminum alone, which matters in windy or snowy regions.

Zinc: Protection and Performance

Used mainly as a coating to protect steel from rust (galvanization).

Zinc oxide can also appear in certain solar cell designs to boost efficiency.

Electrical Metals Inside the Panel

Copper: The Power Highway

Copper runs through the system as cables, busbars, and internal wiring.

It’s used because it combines excellent conductivity with durability, helping reduce energy loss as electricity leaves the panel.

Silver: Tiny Amount, Big Impact

Silver is used in very thin conductive lines on the front and back of crystalline silicon cells, often called the grid and contacts.

It has the best electrical conductivity of any metal, so even a small amount improves panel efficiency.

The downside: silver is expensive, so there’s an industry‑wide push to reduce silver use or replace it with cheaper metals.

Semiconductor and Specialty Metals

Although silicon is technically a metalloid, it’s the heart of most solar cells. Around it, different panel technologies use small but important amounts of other metals.

Common Specialty Metals (Often in Thin‑Film or Advanced Cells)

Indium and gallium – Used in some high‑efficiency thin‑film cells (like CIGS: copper–indium–gallium–selenide).

Selenium and tellurium – Key ingredients in certain thin‑film technologies such as CdTe (cadmium telluride) and CIGS structures.

Cadmium – Appears in cadmium telluride thin‑film modules; highly regulated due to toxicity.

Molybdenum – Used as an electrode layer to collect current in some thin‑film cells.

Tin and nickel – Used in soldering and coatings.

Lead – Found in some solders and older designs; newer regulations drive reductions and lead‑free alternatives.

These metals are usually present in very small quantities compared to glass, polymers, and aluminum, but they strongly influence performance and environmental discussions.

By Weight: What’s Actually Inside?

Here’s what a typical crystalline silicon panel looks like by weight (not just metals):

html

<table>
  <thead>
    <tr>
      <th>Material</th>
      <th>Approx. share by weight</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Glass</td>
      <td>~76%<sup>[web:8][web:10]</sup></td>
    </tr>
    <tr>
      <td>Plastic polymers (encapsulant, backsheet)</td>
      <td>~10%<sup>[web:8][web:10]</sup></td>
    </tr>
    <tr>
      <td>Aluminum (frame)</td>
      <td>~8%<sup>[web:8][web:10]</sup></td>
    </tr>
    <tr>
      <td>Silicon (cells)</td>
      <td>~5%<sup>[web:8][web:10]</sup></td>
    </tr>
    <tr>
      <td>Copper (wiring, busbars)</td>
      <td>~1%<sup>[web:8][web:10]</sup></td>
    </tr>
    <tr>
      <td>Silver and other metals</td>
      <td>&lt;0.1%<sup>[web:8][web:10]</sup></td>
    </tr>
  </tbody>
</table>

Environmental and “Latest News” Angle

Because solar capacity is booming worldwide in the 2020s, the metals inside panels are now part of bigger conversations about mining, supply chains, and recycling. A few current themes:

Silver reduction: Manufacturers are actively cutting silver content or experimenting with copper‑based pastes to reduce costs and supply risks.

Aluminum and copper recycling: Frames and wiring are relatively easy to recycle, making these metals central to solar circular‑economy plans.

Critical minerals: Indium, gallium, selenium, and tellurium are under scrutiny as “critical” or strategic materials because they’re important for high‑efficiency solar but not widely available.

Toxic metals management: Cadmium and lead use is tightly regulated, with recycling programs designed to keep them out of the environment.

On forums and industry blogs, you’ll frequently see debates about whether future panels will move away from silver and rare elements toward more abundant metals like copper and aluminum, as well as how quickly large‑scale recycling will ramp up.

Mini Story: A Panel’s Metal Journey

Imagine a single rooftop panel on a typical home system: its aluminum frame was once bauxite ore, mined and refined, then extruded into a sturdy rectangle. Inside, thin silver lines painted onto silicon cells collect electrons and funnel them into copper wires that run off your roof to an inverter. Steel rails, protected with zinc, hold the panel in place through storms, while trace metals in the cells quietly boost efficiency by a percent here and there. After 25–30 years of work, that same frame and copper wiring can be stripped and recycled, turning yesterday’s sunshine machine into tomorrow’s metal feedstock.

TL;DR (Bottom Line)

Most of a solar panel’s metal mass is aluminum (frame) and steel (racks), with copper and silver handling the electricity and zinc protecting steel from corrosion. On top of that, small amounts of specialized metals like indium, gallium, selenium, and tellurium appear in certain panel types to push efficiency higher.

Information gathered from public forums or data available on the internet and portrayed here.