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Related Concept Videos

P-N junction01:11

P-N junction

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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Beyond Flat: Undulated Perovskite Solar Cells on Microscale Si Pyramids by Solution Processing.

Deniz Turkay1, Kerem Artuk1, Mostafa Othman1

  • 1École Polytechnique Fédérale de Lausanne (EPFL), Institute of Electrical and Micro Engineering (IEM), Photovoltaics and Thin-Film Electronics Laboratory (PV-lab), Rue de la Maladière 71b, 2000 Neuchâtel, Switzerland.

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Researchers developed a new method for creating high-performance perovskite solar cells on microscale silicon pyramids using solution processing. This breakthrough enhances optical properties and efficiency, paving the way for advanced tandem solar devices.

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Microscale pyramids on silicon solar cells typically hinder solution-processed perovskite film formation.
  • Previous methods involved submicron pyramids and flattened surfaces, compromising optical performance.

Purpose of the Study:

  • To enable conformal perovskite film formation on tall microscale silicon pyramids using solution processing.
  • To improve the optical and electronic performance of perovskite-silicon solar cells.

Main Methods:

  • Tailoring perovskite film thickness to match the height profile of over 2 μm-high random silicon pyramids.
  • Spin-coating perovskite films without modifying pyramid facets.
  • Fabricating perovskite solar cells and perovskite-silicon tandem devices.

Main Results:

  • Achieved protrusion-free perovskite films on tall pyramids with electronic performance comparable to flat substrates.
  • Demonstrated proof-of-concept perovskite-silicon tandem devices with 33% efficiency.
  • Showcased enhanced conformality leading to superior optical performance, especially upon encapsulation.

Conclusions:

  • Solution processing of perovskite films is compatible with tall microscale silicon pyramids.
  • The developed method offers a pathway to high-efficiency, cost-effective perovskite-silicon tandem solar cells.
  • Enhanced conformality improves optical performance for outdoor applications.