Short-circuit Current Density Chasing and Breakthroughs in High Efficiency Silicon Heterojunction Solar Cells

Silicon heterojunction (SHJ) solar cell shows high efficiency and open-circuit voltage due to its double sides passivated contacts. However, the hydrogenated amorphous silicon (a-Si:H) layers and transparent conductive oxide (TCO) layers could cause parasitic absorption, leading to lower short-circuit current density (Jsc) compared to other crystalline record cells. This abstract reviews the eminent work which has been done in Forschungszentrum Jülich for chasing up Jsc in high efficiency SHJ solar cells. Three different parts of this work have been presented and discussed, including implementation of nanocrystalline silicon carbide based transparent passivating contact (TPC), front-side TCO-free design and Catalytic doping (Cat-doping) in SHJ solar cells. We have achieved certified efficiency of 23.99% with a Jsc of 40.87 mA/cm2 for TPC solar cells. The front-side TCO-free SHJ solar cells have been demonstrated by effective modulation between the metal contact and a-Si:H layers. Finally, we showed the present status and potential of Cat-doping in SHJ solar cells. The challenges and future research directions for these three methods were also discussed in between. We would like to show more detailed information and better results in the conference.