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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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Planar-Structure Perovskite Solar Cells with Efficiency beyond 21.

Qi Jiang1,2, Zema Chu1, Pengyang Wang1,2

  • 1Key Lab of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, P. R. China.

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Summary

Optimizing lead iodide (PbI2) content in low-temperature perovskite solar cells is key. Moderate PbI2 levels achieve high efficiency and stability without hysteresis, setting new records for planar-structure devices.

Keywords:
hysteresisperovskite solar cellsplanar structuresstability

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Low-temperature solution-processed planar-structure perovskite solar cells are gaining attention.
  • Their power conversion efficiencies (PCEs) lag behind high-temperature mesoporous counterparts.
  • Existing research primarily focuses on perovskite morphology and interface engineering.

Purpose of the Study:

  • To systematically investigate the impact of precise stoichiometry, specifically lead iodide (PbI2) content, on device performance.
  • To understand how PbI2 levels influence efficiency, hysteresis, and stability in planar perovskite solar cells.
  • To identify optimal PbI2 concentrations for high-performing and stable devices.

Main Methods:

  • Fabrication of planar-structure perovskite solar cells using low-temperature solution processing.
  • Systematic variation of lead iodide (PbI2) content within the perovskite layer.
  • Characterization of device performance, including power conversion efficiency (PCE), hysteresis, and operational stability.
  • Certification of device efficiency using established protocols.

Main Results:

  • A moderate residual PbI2 content was found to yield stable, high-efficiency perovskite solar cells without hysteresis.
  • Excessive PbI2 led to significant hysteresis and poor operational stability.
  • Achieved efficiencies of 21.6% (0.0737 cm2) and 20.1% (1 cm2) with moderate residual PbI2.
  • Certified efficiency of 20.9% for small-area devices, a record for planar-structure perovskite solar cells.

Conclusions:

  • Precise control over PbI2 stoichiometry is crucial for optimizing planar-structure perovskite solar cells.
  • Moderate residual PbI2 is beneficial for achieving high efficiency, stability, and reduced hysteresis.
  • These findings highlight the significant potential of planar-structure perovskite solar cells for future applications.