Amorphous silicon thin film deposition for poly-si/sio2 contact cells to minimize parasitic absorption in the near-infrared region

Changhyun Lee, Jiyeon Hyun, Jiyeon Nam, Seok Hyun Jeong, Hoyoung Song, Soohyun Bae, Hyunju Lee, Jaeseung Seol, Donghwan Kim, Yoon Mook Kang, Hae Seok Lee

Research output: Contribution to journalArticlepeer-review


Tunnel oxide passivated contact (TOPCon) solar cells are key emerging devices in the commercial silicon-solar-cell sector. It is essential to have a suitable bottom cell in perovskite/silicon tandem solar cells for commercial use, given that good candidates boost efficiency through increased voltage. This is due to low recombination loss through the use of polysilicon and tunneling oxides. Here, a thin amorphous silicon layer is proposed to reduce parasitic absorption in the near-infrared region (NIR) in TOPCon solar cells, when used as the bottom cell of a tandem solar-cell system. Lifetime measurements and optical microscopy (OM) revealed that modifying both the timing and temperature of the annealing step to crystalize amorphous silicon to polysilicon can improve solar cell performance. For tandem cell applications, absorption in the NIR was compared using a semitransparent perovskite cell as a filter. Taken together, we confirmed the positive results of thin poly-Si, and expect that this will improve the application of perovskite/silicon tandem solar cells.

Original languageEnglish
Article number8199
Issue number24
Publication statusPublished - 2021 Dec 1


  • Amorphous silicon
  • Passivated contact
  • Silicon solar cells
  • Tunnel oxide passivated contact

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Control and Optimization
  • Electrical and Electronic Engineering


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