Enhancing electron diffusion length in narrow-bandgap perovskites for efficient monolithic perovskite tandem solar cells

Zhibin Yang, Zhenhua Yu, Haotong Wei, Xun Xiao, Zhenyi Ni, Bo Chen, Yehao Deng, Severin N. Habisreutinger, Xihan Chen, Kang Wang, Jingjing Zhao, Peter N. Rudd, Joseph J. Berry, Matthew C. Beard and Jinsong Huang ()
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Zhibin Yang: University of North Carolina
Zhenhua Yu: University of North Carolina
Haotong Wei: University of North Carolina
Xun Xiao: University of North Carolina
Zhenyi Ni: University of North Carolina
Bo Chen: University of North Carolina
Yehao Deng: University of North Carolina
Severin N. Habisreutinger: Chemistry & Nanoscience Center, National Renewable Energy Lab
Xihan Chen: Chemistry & Nanoscience Center, National Renewable Energy Lab
Kang Wang: Chemistry & Nanoscience Center, National Renewable Energy Lab
Jingjing Zhao: University of North Carolina
Peter N. Rudd: University of North Carolina
Joseph J. Berry: Chemistry & Nanoscience Center, National Renewable Energy Lab
Matthew C. Beard: Chemistry & Nanoscience Center, National Renewable Energy Lab
Jinsong Huang: University of North Carolina

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract Developing multijunction perovskite solar cells (PSCs) is an attractive route to boost PSC efficiencies to above the single-junction Shockley-Queisser limit. However, commonly used tin-based narrow-bandgap perovskites have shorter carrier diffusion lengths and lower absorption coefficient than lead-based perovskites, limiting the efficiency of perovskite-perovskite tandem solar cells. In this work, we discover that the charge collection efficiency in tin-based PSCs is limited by a short diffusion length of electrons. Adding 0.03 molar percent of cadmium ions into tin-perovskite precursors reduce the background free hole concentration and electron trap density, yielding a long electron diffusion length of 2.72 ± 0.15 µm. It increases the optimized thickness of narrow-bandgap perovskite films to 1000 nm, yielding exceptional stabilized efficiencies of 20.2 and 22.7% for single junction narrow-bandgap PSCs and monolithic perovskite-perovskite tandem cells, respectively. This work provides a promising method to enhance the optoelectronic properties of narrow-bandgap perovskites and unleash the potential of perovskite-perovskite tandem solar cells.

Date: 2019
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DOI: 10.1038/s41467-019-12513-x

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