Nature Energy: 26.81% efficiency! Silicon heterojunction solar cells

• Silicon heterojunction (SHJ) solar cells have achieved high power conversion efficiencies due to their efficient passivation contact structures. These improved contact optoelectronic properties can enable higher device efficiencies, further stimulating the commercial potential of SHJ technology. Recently, Xu Xixiang, Yin Shi of Longji Green Energy Technology Co., Ltd., Gao Pingqi of Sun Yat-sen University and others realized a silicon heterojunction solar cell with an efficiency of up to 26.81% through an electrically optimized nanocrystalline silicon hole contact layer.

• The authors improved the efficiency of back-junction SHJ solar cells through an improved back contact consisting of p-type doped nanocrystalline silicon and a transparent conducting oxide with low sheet resistance. The authors analyze the electrical properties of hole-selective contacts and compare them with p-type doped amorphous silicon contacts.

  
  

  Furthermore, the authors achieved improved charge carrier transport properties and low contact resistivity (<5 mΩ cm2). Finally, by testing on industrial-grade silicon wafers (274 cm2, M6 size), the authors report a range of certified power conversion efficiencies.

  
  
• 
• 
• 
• 

• Hao Lin et.al Silicon heterojunction solar cells with up to 26.81% efficiency achieved by electrically optimized nanocrystalline-silicon hole contact layers Nature Energy 2023

  DOI: 10.1038/s41560-023-01255-2

  https://doi.org/10.1038/s41560-023-01255-2