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Related Concept Videos

P-N junction01:11

P-N junction

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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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Updated: Apr 8, 2026

Flash Infrared Annealing for Perovskite Solar Cell Processing
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Degradation Mechanisms Associated with Electron-Blocking Layers in Inverted Perovskite Solar Cells.

Xiongzhuo Jiang1,2,3, Jie Zeng1, Kun Sun2,4

  • 1Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|April 7, 2026
PubMed
Summary

The 2PACz electron-blocking layer significantly enhances perovskite solar cell (PSC) efficiency and operational stability. This material choice minimizes perovskite lattice distortion, crucial for long-term performance under thermal cycling.

Keywords:
degradation mechanismelectron‐blocking layerinverted perovskite solar cellsoperando measurementstrain evolution

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Solid-State Physics

Background:

  • Operational stability of perovskite solar cells (PSCs) under thermal cycling is a critical challenge.
  • Electron-blocking layers (EBLs) play a key role in PSC performance and stability.
  • Understanding degradation mechanisms is essential for developing durable PSCs.

Purpose of the Study:

  • Investigate the impact of different EBLs (NiOx, PTAA, 2PACz) on PSC operational stability, particularly under thermal cycling.
  • Determine the degradation mechanisms of PSCs with varying EBLs.
  • Provide insights into rational EBL selection for highly stable PSCs.

Main Methods:

  • Fabrication and performance testing of PSCs with NiOx, PTAA, and 2PACz EBLs.
  • Operando grazing incidence wide-angle X-ray (GIWAXS) measurements to study perovskite structure.
  • Light soaking and solar-thermal cycling tests to assess device stability.
  • Analysis of power conversion efficiency (PCE) and degradation over time.

Main Results:

  • 2PACz-based PSCs achieved the highest PCE (25.74%), outperforming NiOx (23.35%) and PTAA (24.57%) devices.
  • 2PACz devices demonstrated excellent stability under light soaking (>1500 h T90) and thermal cycling.
  • Higher PCE in 2PACz devices is attributed to reduced trap density, prolonged carrier lifetime, and suppressed non-radiative recombination.
  • Operando GIWAXS revealed lower lattice distortion in 2PACz devices during thermal cycling, indicating superior structural stability.

Conclusions:

  • The 2PACz EBL is crucial for achieving high efficiency and exceptional operational stability in PSCs.
  • Interface engineering with appropriate EBLs, like 2PACz, effectively mitigates degradation pathways.
  • This study provides critical experimental evidence for selecting EBL materials to enhance PSC durability.