Cell cross-section

All UNI-SOLAR® products are based on a sophisticated multi-layer amorphous silicon thin-film solar cell developed originally by Energy Conversion Devices, Inc. This spectrum-splitting cell, shown schematically above, is constructed of separate p-i-n type, amorphous semiconductor solar sub-cells, each with a different spectral response characteristic.

This allows the cell to convert the different visible and near infrared wavelengths of sunlight with optimal efficiency. The United Solar spectrum-splitting multijunction design now holds all the world’s records for amorphous silicon solar cell efficiency, including the highest stable efficiency measured by the National Renewable Energy Laboratory (NREL) for a small-area amorphous silicon solar cell — 13 percent.

Solar cell factory

The United Solar thin-film cells are manufactured in a unique continuous roll-to-roll deposition process. Each of the nine thin-film semiconductor layers that comprise the cell is sequentially deposited in separate, dynamically-isolated, plasma enhanced chemical vapor deposition (PECVD) chambers as the stainless steel substrate progresses through the machine. The company’s manufacturing plant has a production capacity of twenty five million watts of solar cells.

The thin-film materials, cell designs, and manufacturing processes used by United Solar Systems Corp. are protected by more than 160 issued U.S. patents.

Leasing Solar cells

Leasing option for cells only: Deposit required of £10.00/cell and £4/week for the first week then £2 per week after that. This leasing fee covers normal handling and wear and tear of flexible PV cells. The recipient is responsible for any breakage and loss at the replacement value as the shop price. If you decide to buy any cells at the end of leasing period then the leasing charge is subtracted from the normal buying price. All leased PV cells must be returned to Schools & Homes Energy Education Project. Applies to single and double cells.