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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: Feb 20, 2026

Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer
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A Solid-State Intrinsically Stretchable Polymer Solar Cell.

Lu Li1,2, Jiajie Liang2, Huier Gao2

  • 1Research Institute for New Materials Science, Chongqing University of Arts and Sciences , Chongqing 402160, China.

ACS Applied Materials & Interfaces
|October 26, 2017
PubMed
Summary
This summary is machine-generated.

This study presents a stretchable organic solar cell using a PTB7:PC71BM blend that exhibits elastic deformability up to 100% strain. The flexible solar cell maintains performance and increases power generation when stretched.

Keywords:
intrinsicpolymer solar cellssemitransparentsolid statestretchable

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Polymer Science

Background:

  • Organic solar cells (OSCs) rely on bulk heterojunction morphology for performance.
  • Mechanical compliance is crucial for flexible and wearable electronics.
  • Controlling morphology in polymer:fullerene blends impacts both electronic and mechanical properties.

Purpose of the Study:

  • To investigate the elastic deformability of a PTB7:PC71BM:DIO blend for organic solar cells.
  • To understand the morphological changes under strain and their effect on photovoltaic performance.
  • To develop a highly stretchable and efficient organic solar cell.

Main Methods:

  • Fabrication of organic solar cells using a PTB7:PC71BM:DIO blend.
  • Employing stretchable transparent electrodes based on silver nanowires and carbon nanotubes.
  • Characterizing device performance under varying degrees of mechanical strain (up to 100%).
  • Analyzing morphological changes using nanoscale imaging and reorientation studies.

Main Results:

  • The PTB7:PC71BM:DIO blend demonstrated reversible elastic deformability up to 100% strain.
  • Nanocrystalline grains and polymer chains reoriented with strain, accommodating deformation.
  • Power conversion efficiency showed a slight increase up to 30% strain and a global increase in power generation due to expanded active area.
  • Device efficiency decreased after 100 stretching cycles, but initial performance was promising (3.48% to 3.67%).

Conclusions:

  • PTB7:PC71BM:DIO blends exhibit rubbery elasticity and reversible morphological changes, enabling highly stretchable organic solar cells.
  • Mechanical strain can influence photovoltaic performance and power output through morphological adaptation.
  • These findings pave the way for developing robust, flexible, and wearable organic electronic devices.