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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: Jan 8, 2026

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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Defect Dynamics and Solution-Processed Interconnects in Perovskite-Organic Tandem Solar Cells.

Yingjie Hu1, Qianyi Li1, Kaifeng Jing1

  • 1Department of Electrical and Electronic Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, 999077, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|December 12, 2025
PubMed
Summary
This summary is machine-generated.

Perovskite-organic tandem solar cells achieve over 25% efficiency by addressing defects in wide-bandgap perovskite layers and optimizing interconnecting layers. This breakthrough enhances both performance and stability for next-generation solar technology.

Keywords:
Defectsinterconnecting layersperovskite‐organic tandem solar cellsstabilityvoltage loss

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Semiconductor Physics

Background:

  • Perovskite and organic semiconductors share properties like bandgap tunability and solution processability, making them suitable for perovskite-organic tandem solar cells (POTSCs).
  • Efficiency and stability of POTSCs are currently limited by electrical losses in wide-bandgap (WBG) perovskite layers and interconnecting layers (ICLs).

Purpose of the Study:

  • To identify the cause of open-circuit voltage (VOC) losses in WBG perovskites and mitigate them.
  • To develop improved ICLs for POTSCs to reduce electrical losses and enhance device stability.
  • To achieve high efficiency and operational stability in POTSCs through synergistic strategies.

Main Methods:

  • Investigated mobile defects at the surface regions of WBG perovskites as the cause of VOC losses.
  • Employed a passivation agent with functional chemical groups to heal mobile defects in WBG perovskites.
  • Developed solution-processed graphene oxide (GO) layers as ICLs for tandem solar cells.

Main Results:

  • Passivation of mobile defects enhanced VOC to 1.35 V for WBG perovskite solar cells (bandgap 1.81 eV).
  • Solution-processed GO ICLs reduced electrical losses and improved the operational stability of POTSCs.
  • Synergistic integration of defect passivation and optimized ICLs enabled POTSCs to exceed 25% efficiency.

Conclusions:

  • Effective passivation of WBG perovskite surface defects is crucial for improving VOC.
  • Graphene oxide ICLs offer a viable solution for reducing losses and enhancing stability in POTSCs.
  • The developed strategies pave the way for highly efficient and stable perovskite-organic tandem solar cells.