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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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Flash Infrared Annealing for Perovskite Solar Cell Processing
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Ionic Defect Analysis and Suppression for Highly Efficient and Stable Perovskite Solar Cells and Mini-Modules.

Bonghyun Jo1,2, Jun Zhu3, Gill Sang Han4

  • 1School of Advanced Materials Science & Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea.

ACS Applied Materials & Interfaces
|December 20, 2025
PubMed
Summary

Deep-level traps in perovskite solar cells hinder performance and stability. This study uses temperature-dependent deep-level transient spectroscopy to identify these defects, leading to an additive strategy that improves efficiency and durability.

Keywords:
defect passivationperovskite solar cellstemperature-dependent deep-level transient spectroscopytrap density

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Solid-State Physics

Background:

  • Solution-processed organohalide perovskite solar cells achieve high power-conversion efficiencies (PCE).
  • Lattice point defects in perovskites act as nonradiative recombination centers, creating midgap states and accelerating degradation.
  • While surface passivation and shallow-trap mitigation improved PCE, deep-level traps remain poorly understood.

Purpose of the Study:

  • To comprehensively characterize the defect spectrum in working perovskite solar cells.
  • To understand the role of deep-level traps in device performance and stability.
  • To develop a targeted strategy for mitigating deep traps and enhancing perovskite photovoltaics.

Main Methods:

  • Utilized temperature-dependent deep-level transient spectroscopy (T-DLTS) to analyze the defect landscape.
  • Investigated the impact of identified deep traps on device performance.
  • Developed and applied a novel additive protocol to suppress deep traps.

Main Results:

  • T-DLTS successfully revealed the full spectrum of deep-level defects in perovskite films.
  • The targeted additive protocol effectively suppressed deep traps.
  • Perovskite solar cells achieved 23.36% PCE and modules reached 20.68% PCE.
  • Devices demonstrated enhanced stability under continuous 1-sun illumination.

Conclusions:

  • Deep-level trap management is crucial for scalable and reliable perovskite solar cells.
  • Addressing deep traps significantly improves both the efficiency and durability of perovskite devices.
  • The developed additive protocol offers a promising route for high-performance perovskite photovoltaics.