Trina Solar says its State Key Laboratory (SKL) of PV Science and Technology (PVST) has achieved 25.04% total-area efficiency for a large-area (243.18 cm2) n-type mono-crystalline silicon (c-Si) Interdigitated Back Contact (IBC) solar cell, with open-circuit voltage up to 715.6 mV. The result was independently certified by Japan Electric Safety and Environmental Technology Laboratory (JET) and is now the leader in that efficiency category.
IBC solar cell explained
The IBC solar cell is the most complicated but with the highest cell efficiency for mass production c-Si solar cell today. The record-breaking n-type mono-crystalline silicon solar cell was fabricated on a large-sized industrial phosphorous-doped Cz Silicon substrate with a low-cost industrial IBC process, featuring conventional tube doping technologies and fully screen-printed metallization.
The 6-inch solar cell reached a total-area efficiency of 25.04% as independently measured by JET in Japan. The IBC solar cell has a total measured area of 243.18cm2 and was measured without any aperture. The champion cell presents the following characteristics: an open-circuit voltage Vocof 715.6 mV, a short-circuit current density Jsc of 42.27 mA/cm2 and a fill factor FF of 82.81%. It has been demonstrated to be the first single-junction c-Si solar cell developed in China to attain an efficiency above 25%, and also has been demonstrated to be the highest efficiency c-Si single junction solar cell based on a 6-inch large-area c-Si substrate.
— Solar Builder magazine