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P-N junction01:11

P-N junction

701
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...
701

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Related Experiment Video

Updated: Sep 20, 2025

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
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Intermolecular Interaction Induced Synergistic Passivation toward Efficient and Stable 1.68 eV Bandgap Perovskite

Zheng Zhang1, Zhixing Yu1, Jiaqi Zhao1

  • 1Province-Ministry Co-construction Collaborative Innovation Center of Hebei Photovoltaic Technology, College of Physics Science and Technology, Hebei University, Baoding, 071002, China.

Small (Weinheim an Der Bergstrasse, Germany)
|May 27, 2025
PubMed
Summary

Researchers developed a new passivation strategy using oleic acid and phenylethylammonium iodide to enhance wide-band-gap perovskite solar cells (PSCs). This method improves efficiency and significantly boosts the environmental stability of these solar devices.

Keywords:
chemical synergistic passivationoleic acidphenylethylammonium iodidewide‐bandgap perovskite solar cells

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Wide-band-gap perovskite solar cells (PSCs) face challenges in performance and stability due to nonradiative recombination and environmental degradation.
  • Addressing these limitations is crucial for advancing PSC technology for practical applications.

Purpose of the Study:

  • To develop a chemical synergistic passivation strategy to improve the efficiency and environmental stability of wide-band-gap PSCs.
  • To investigate the mechanism of passivation using a combined oleic acid (OA) and phenylethylammonium iodide (PEAI) treatment.

Main Methods:

  • A novel passivator, O-PEAI, was synthesized through a neutralization reaction between OA and PEAI, forming amide groups.
  • The passivation effect on perovskite films was analyzed by measuring carrier lifetime and carrier transfer rates.
  • Perovskite solar cells were fabricated and tested for power conversion efficiency and long-term stability under ambient conditions.

Main Results:

  • The O-PEAI treatment significantly increased carrier lifetime from 0.179 to 0.270 µs and enhanced carrier transfer rates sevenfold compared to PEAI alone.
  • The resulting wide-band-gap PSCs achieved a champion power conversion efficiency of 22.46%.
  • Unencapsulated devices maintained 90.4% of their initial efficiency after 1000 hours of storage in 40% relative humidity, demonstrating improved environmental stability.

Conclusions:

  • The chemical synergistic passivation strategy effectively suppresses nonradiative recombination and enhances the stability of wide-band-gap PSCs.
  • The O-PEAI passivator offers a promising route for developing highly efficient and durable perovskite solar cells.
  • This approach contributes to overcoming key challenges in perovskite solar technology.