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Related Concept Videos

P-N junction01:11

P-N junction

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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Related Experiment Video

Updated: Dec 28, 2025

Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation

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On-device lead sequestration for perovskite solar cells.

Xun Li1, Fei Zhang2, Haiying He1,3

  • 1Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL, USA.

Nature
|February 21, 2020
PubMed
Summary

Perovskite solar cells can be made safer with a novel chemical coating that absorbs over 96% of lead leakage after damage. This innovation addresses environmental concerns for widespread adoption of this photovoltaic technology.

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Area of Science:

  • Materials Science
  • Environmental Science
  • Renewable Energy

Background:

  • Perovskite solar cells offer high efficiency and low cost but face commercialization hurdles.
  • Lead toxicity and leaching from perovskite devices are significant, unexplored environmental and health risks.
  • Lead leakage is a particular concern for building-integrated photovoltaics.

Purpose of the Study:

  • To develop a chemical method for on-device lead sequestration in perovskite solar cells.
  • To mitigate environmental and public health risks associated with lead leakage from damaged perovskite solar cells.

Main Methods:

  • A lead-absorbing coating was applied to both the front and back of the perovskite solar cell device stack.
  • A transparent molecular film with phosphonic acid groups was used on the glass side to bind lead.
  • A polymer film with lead-chelating agents was applied to the back electrode side.

Main Results:

  • The developed coating effectively sequesters over 96% of lead leakage following severe device damage.
  • The lead-absorbing films swell and absorb water, retaining structural integrity instead of dissolving.
  • This approach facilitates easy collection of lead after device damage.

Conclusions:

  • This chemical approach significantly reduces lead leakage from damaged perovskite solar cells.
  • The on-device sequestration method enhances the environmental and public health safety profile of perovskite photovoltaics.
  • The findings support the commercialization of perovskite solar cells, particularly for building-integrated applications.