Solar photovoltaic panels placed in the back

Back Contact (BC) solar modules are photovoltaic panels in which all the electrical contacts — both positive and negative — are located on the rear side of the solar cell. This contrasts with most conventional technologies, where metallic contacts are present on the front, partially shading the light-absorbing surface.

Backsheets play an important role in safeguarding photovoltaic cells from adverse and extreme temperatures. By acting as a protective barrier, they prevent the cells from getting exposed to high-energy photons that could cause thermal stress and potentially damage the cells or lower their efficiency.

The outer layer of a solar panel that serves as the primary defense for solar module components, particularly the solar cells, is known as a solar backsheet. It works by safeguarding solar panels against different and severe environmental conditions, UV radiation, moisture, dust, etc., throughout their lifespan.

The rigidity helps the solar panel to stay upright and prevents vibrations from affecting the overall structure. The layer of the backsheet acts as a protective cover against water and moisture. In photovoltaic modules, moisture accumulation can lead to the corrosion of metal parts.

As the global solar industry races toward higher efficiency and better performance, Back Contact (BC) solar modules are emerging as one of the most promising technologies for the next wave of innovation.

Backsheets act as a preventive mechanism to stop moisture and minimize the possibility of insulation degradation, short-circuiting, and corrosion of electrical connections or components. Backsheets safeguard the electrical components of a solar module by providing insulation and ensuring their longevity.