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Related Concept Videos

P-N junction01:11

P-N junction

591
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...
591

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Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
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Minimizing buried interfacial defects for efficient inverted perovskite solar cells.

Shuo Zhang1, Fangyuan Ye1,2, Xiaoyu Wang3

  • 1Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Shanghai Key Laboratory of Functional Materials Chemistry, Frontiers Science Center for Materiobiology and Dynamic Chemistry, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, China.

Science (New York, N.Y.)
|April 27, 2023
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Summary

Researchers developed a new molecular hole transporter for inverted perovskite solar cells. This material improves perovskite film quality, minimizes defects, and achieves high power conversion efficiency (PCE) and stability.

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Controlling perovskite morphology and defects at the buried perovskite-substrate interface is crucial for high-performance inverted perovskite solar cells.
  • Existing methods face challenges in achieving defect-free interfaces, limiting device efficiency and stability.

Purpose of the Study:

  • To develop a novel amphiphilic molecular hole transporter for improved perovskite film quality and interface control.
  • To enhance the performance and stability of inverted perovskite solar cells through defect minimization at the buried interface.

Main Methods:

  • Synthesized and characterized an amphiphilic molecular hole transporter with a multifunctional cyanovinyl phosphonic acid group.
  • Utilized the transporter as a superwetting underlayer for perovskite deposition.
  • Evaluated perovskite film quality, photoluminescence quantum yield, and Shockley-Read-Hall lifetime.
  • Fabricated and tested inverted perovskite solar cells and minimodules, assessing power conversion efficiency (PCE), open-circuit voltage, fill factor, and operational/damp heat stability.

Main Results:

  • The novel transporter facilitated the formation of high-quality perovskite films with minimized buried interface defects.
  • Achieved a certified power conversion efficiency (PCE) of 25.4% for small-area cells, with an open-circuit voltage of 1.21 V and fill factor of 84.7%.
  • Demonstrated high PCEs of 23.4% for 1 cm² cells and 22.0% for 10 cm² minimodules.
  • Perovskite films exhibited a photoluminescence quantum yield of 17% and a Shockley-Read-Hall lifetime of nearly 7 microseconds.
  • Encapsulated modules showed excellent stability under operational and damp heat testing.

Conclusions:

  • The developed amphiphilic molecular hole transporter effectively controls perovskite morphology and reduces defects at the buried interface.
  • This approach leads to significantly enhanced power conversion efficiency and operational stability in inverted perovskite solar cells and modules.
  • The findings offer a promising strategy for advancing perovskite solar cell technology towards commercial viability.