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Related Concept Videos

P-N junction01:11

P-N junction

590
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...
590

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Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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Laser Derived Electron Transport Layers with Embedded p-n Heterointerfaces Enabling Planar Perovskite Solar Cells

Wenhao Zhao1, Pengfei Guo1,2, Chen Liu1

  • 1State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi'an, 710072, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|May 10, 2023
PubMed
Summary
This summary is machine-generated.

Embedding titanium dioxide (TiO2) electron transport layers (ETLs) in p-n heterointerfaces significantly boosts electron mobility, enhancing perovskite solar cell performance and stability.

Keywords:
electron mobilityelectron transport layersp-n heterointerfacesparticle boundariesperovskite solar cells

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Area of Science:

  • Materials Science
  • Renewable Energy

Background:

  • Metal oxide electron transport layers (ETLs) in perovskite solar cells (PSCs) suffer from low carrier mobility, limiting device efficiency.
  • Titanium dioxide (TiO2) is a common ETL material, but its performance is hindered by carrier loss at particle boundaries.

Purpose of the Study:

  • To enhance the electron mobility of TiO2 ETLs for high-performance planar perovskite photovoltaics.
  • To improve the efficiency and stability of formamidinium lead iodide perovskite solar cells (PSCs).

Main Methods:

  • Embedding TiO2 ETLs in p-n heterointerfaces to address carrier loss at particle boundaries.
  • Utilizing the heterointerface to inhibit rutile phase TiO2 formation and promote high-quality perovskite film growth with fewer defects.

Main Results:

  • Electron mobility of the ETLs was boosted by three orders of magnitude.
  • Achieved a champion power conversion efficiency of 25.05% for planar PSCs, setting a new benchmark for TiO2 ETLs.
  • Demonstrated significantly improved environmental stability, retaining over 80% efficiency after 9000 hours of air storage and over 90% under continuous illumination for 500 hours.

Conclusions:

  • The p-n heterointerface embedding strategy is a universal approach to overcome low carrier mobility in metal oxide ETLs.
  • This method offers a pathway to highly efficient and stable perovskite solar cells.