CSEM : researchers raised the one-sun efficiency of a fully industry-compatible silicon heterojunction solar cell to 24.2 %.


CSEM solar cell Neuchâtel

This outstanding result was made possible by the accurate tailoring of the manufacturing process based on the unique know-how of CSEM in thin-film deposition.

Since its creation in 2013, the CSEM PV-center has been developing advanced materials, processes, and concepts to foster the market entrance of silicon heterojunction technology. Recently, its teams realized a two side-contacted silicon heterojunction solar cell with an efficiency as high as 24.2 percent (independently certified by ISFH CalTec, Germany). This is among the highest efficiencies reported for such a device, further demonstrating the high potential of this technology.

Remarkably, this device was entirely fabricated using industry-compatible techniques, such as plasma-enhanced chemical vapor deposition and sputtering for thin-film deposition and screen printing for realizing the electrical contacts at the front of the solar cell.

This achievement was made possible by an in-depth understanding of the physical phenomena currently limiting the transport of the charge carriers within the solar cells, and by a smart combination of thin silicon layers to mitigate these detrimental effects,

explains Laurie-Lou Senaud, the PhD candidate in charge of these developments.

CSEM PV-center teams are now actively working toward achieving even higher efficiencies, by continuously mitigating the loss mechanisms occurring within the solar cells. The gap to the current worldwide record heterojunction device, with 25.1 percent efficiency, is hence expected to be bridged soon.