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Related Concept Videos

P-N junction01:11

P-N junction

416
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...
416
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

252
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
252

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Updated: May 15, 2025

Developing High Performance GaP/Si Heterojunction Solar Cells
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Buried Interfacial Passivation in NiOx-Based Inverted Semi-Transparent Perovskite Solar Cells.

Bhavna Sharma1, Mohammad Adil Afroz1, Tejasvini Sharma1

  • 1Department of Physics, Indian Institute of Technology Roorkee, Roorkee, Haridwar, Uttarakhand, 247667, India.

Small (Weinheim an Der Bergstrasse, Germany)
|April 10, 2025
PubMed
Summary

Fluorinated benzoic acids enhance semi-transparent perovskite solar cells (STPSCs) by improving the nickel oxide interface, reducing energy loss, and boosting stability for building-integrated photovoltaics.

Keywords:
average visible transmittancebuilding integrated photovoltaicsburied interfacedefect passivationinverted semitransparent perovskite solar cells

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Nanotechnology

Background:

  • Semi-transparent perovskite solar cells (STPSCs) are promising for Building Integrated Photovoltaics (BIPVs).
  • Inverted STPSCs with nickel oxide (NiOx) offer stability and transparency but suffer from poor NiOx/perovskite interfaces, causing recombination and degradation.
  • Effective interfacial engineering is crucial for advancing STPSC performance and longevity.

Purpose of the Study:

  • To investigate the impact of fluorinated benzoic acids on the NiOx/perovskite interface in STPSCs.
  • To explore how fluorine substitution on benzoic acid affects interfacial properties and device performance.
  • To enhance the efficiency and stability of STPSCs for BIPV applications.

Main Methods:

  • Synthesis and characterization of NiOx layers treated with varying fluorinated benzoic acids (4-fluorobenzoic acid, 3,4-di-fluorobenzoic acid, 3,4,5-tri-fluorobenzoic acid).
  • Fabrication and testing of inverted STPSCs incorporating the modified NiOx layers.
  • Performance evaluation including power conversion efficiency (PCE) and average visible transmittance (AVT).
  • Long-term stability testing under controlled humidity conditions.

Main Results:

  • Fluorinated benzoic acids effectively passivated the NiOx/perovskite interface by removing hydroxyl groups and mitigating defect states.
  • STPSCs modified with 4-fluorobenzoic acid achieved a champion PCE of 15.12% with an AVT of approximately 30%.
  • The modified unencapsulated devices retained 90% of their initial PCE after 1500 hours of storage in 30-35% humidity, indicating superior stability.

Conclusions:

  • Interfacial passivation using fluorinated benzoic acids is a viable strategy to reduce non-radiative recombination and enhance the stability of STPSCs.
  • The degree of fluorine substitution influences the effectiveness of interfacial modification.
  • This approach holds significant potential for developing high-performance, durable STPSCs for BIPV applications like facades, windows, and skylights.