Symmetric Bifacial Architecture


OUR HYBRID CELL TECHNOLOGY PLATFORM

The symmetric Bifacial HCT cell architecture uses thin amorphous Silicon films to produce a p-i-(Si substrate)-i-n junction. Each of the four amorphous Si films is ultra-thin at ~10nm thick. Both interfaces between the films and to the substrate are atomically abrupt, hence chemically inert, unlike crystalline Si PV with diffused p-n junctions. Moreover, the low process temperatures ensure no c h e m i c a l interactions throughout the cell manufacturing. The role of Si substrate is to provide a light absorbing m a t e r i a l with a stable, stress-free interface for the deposited amorphous film emitters and collectors. The cell current is collected by blanket layers of transparent conducting oxides, and carried out to the outside world through patterned metal interconnects. These cells are packaged in modules made of double glass panels providing extreme ruggedness combined with unsurpassed aesthetics. Installations are clean and fast with clamps and adapters interfacing into standard trackers on the roof tops.

99% YIELD, 22% EFFICIENCY & LO-COST THROUGH LEAN MANUFACTURING

The production process is a lean 5-step sequence with a cycle time of only 6 hrs, yields >99% and up to 6σ SPC. It includes PECVD for a-Si:H stack, both undoped and doped, and a PVD step for TCO films. The films are deposited both on the front and back side of the substrate for bifacial action.

Both of these critical deposition systems use a similar design as has been proven out for TFT LCD displays. But instead of glass, we deposit on Si substrates laid out on trays.


UP TO 23.5% CELL EFFICIENCY

Our cell efficiencies range from 23 – 23.5% for HCT cells utilizing a precision Cu patterning process technology. With fill factors at 0.80 – 0.82 and Voc’s at 740-750 mV, these cells deliver a jaw-dropping Pmax of >5.6W. The modules deliver 400W STC.


MARKET LEADING BIFACIAL MODULES

Our Bifacial panels provide 10-20% energy boost from reflected and diffuse light. With a 3x higher level of reliability than industry certification requirements. And, superior wo r l d – c l a s s aesthetics. The module efficiencies can easily reach 22% in real-world applications. Moreover, the efficiency remains high even at low irradiance seen around dawn and dusk, as well as in haze or fog.