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


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.

SUBMITTER: Yang Z 

PROVIDER: S-EPMC6776504 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature

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

Yang Zhibin Z   Yu Zhenhua Z   Wei Haotong H   Xiao Xun X   Ni Zhenyi Z   Chen Bo B   Deng Yehao Y   Habisreutinger Severin N SN   Chen Xihan X   Wang Kang K   Zhao Jingjing J   Rudd Peter N PN   Berry Joseph J JJ   Beard Matthew C MC   Huang Jinsong J  

Nature communications 20191003 1


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 diffusio  ...[more]

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