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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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High Performance Inverted RbCsFAPbI3 Perovskite Solar Cells Based on Interface Engineering and Defects Passivation.

Tahir Imran1, Hasan Raza1, Liaquat Aziz1

  • 1Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan, 430074, China.

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Summary

This study enhances formamidine lead iodide perovskite solar cells using a NiOₓ/PTAA hole transporting layer and additives. The optimized cells achieve 22.78% efficiency and maintain performance for 500 hours.

Keywords:
additive engineeringbi-layer hole transport layersdefect passivationformamidinium-cesium perovskiteinverted perovskite solar cells

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Lead halide perovskites solar cells (PSCs) offer high efficiency and low cost.
  • Methylammonium (MA)-free and bromide (Br)-free formamidine perovskites are crucial for thermal stability and desired optical properties.
  • The hole transporting layer (HTL) significantly impacts inverted p-i-n PSC performance.

Purpose of the Study:

  • To optimize charge carrier dynamics and defect chemistry in MA-free, Br-free perovskite absorbers.
  • To enhance the efficiency and stability of formamidine lead iodide perovskite solar cells.
  • To investigate the role of a NiOₓ/PTAA bi-layer HTL with additive and passivation engineering.

Main Methods:

  • Employed a NiOₓ/PTAA bi-layer hole transporting layer.
  • Utilized guanidinium hydrochloride (GuHCl) additive engineering.
  • Applied phenylethylammonium iodide (PEAI) passivation strategy.
  • Fabricated MA-free, Br-free RbCsFAPbI₃-based perovskite solar cells.

Main Results:

  • Achieved a power conversion efficiency of 22.78%.
  • Demonstrated enhanced charge carrier dynamics and tuned defect chemistry.
  • The device retained 95% of its initial performance after 500 hours of continuous 1-sun equivalent LED illumination at 45 °C.

Conclusions:

  • The NiOₓ/PTAA bi-layer HTL, combined with GuHCl additive and PEAI passivation, effectively optimizes MA-free, Br-free perovskite solar cells.
  • The developed strategies lead to high efficiency and improved operational stability.
  • This work contributes to the advancement of stable and efficient perovskite solar cell technology.