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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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Related Experiment Video

Updated: Dec 20, 2025

Flash Infrared Annealing for Perovskite Solar Cell Processing
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Stretchable Perovskite Solar Cells with Recoverable Performance.

Xiangchuan Meng1,2, Zhi Xing1, Xiaotian Hu1,2

  • 1College of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang, 330031, China.

Angewandte Chemie (International Ed. in English)
|May 31, 2020
PubMed
Summary

Flexible perovskite solar cells (PSCs) achieve 19.15% efficiency using a self-healing polyurethane (s-PU) scaffold. This material enhances crystal quality and repairs grain boundaries, enabling stable, stretchable photovoltaic devices.

Keywords:
dynamic covalent polyurethanesgrain boundariesperovskitesself-healing functionstretchability

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Nanotechnology

Background:

  • Perovskite solar cells (PSCs) offer potential for flexible, lightweight, and low-cost photovoltaic applications.
  • Challenges include poor crystallinity and grain boundary defects in perovskites on stretchable substrates, leading to performance degradation.
  • These defects compromise both optoelectronic and mechanical stability.

Purpose of the Study:

  • To improve the performance and stability of stretchable perovskite solar cells.
  • To address the limitations of crystal fragility and grain boundary defects in perovskite films on flexible substrates.
  • To introduce a self-healing mechanism for enhanced mechanical and optoelectronic properties.

Main Methods:

  • Incorporation of a self-healing polyurethane (s-PU) with dynamic oxime-carbamate bonds as a scaffold into perovskite films.
  • Simultaneous enhancement of perovskite crystallinity and passivation of grain boundary defects.
  • Fabrication and testing of stretchable PSCs utilizing the s-PU scaffold.

Main Results:

  • Stretchable PSCs with s-PU achieved a stabilized efficiency of 19.15% with negligible hysteresis.
  • Devices maintained over 90% of initial efficiency after 3000 hours in air due to a self-encapsulating structure.
  • The self-healing s-PU scaffold enabled devices to recover 88% of original efficiency after 1000 cycles at 20% stretch.

Conclusions:

  • The s-PU scaffold effectively enhances perovskite crystallinity and passivates grain boundary defects, significantly improving performance and stability.
  • The self-healing capability of the s-PU is crucial for maintaining device efficiency under mechanical stress and cycling.
  • This strategy offers a promising pathway for the development of robust and reliable flexible and stretchable electronics.