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Related Concept Videos

P-N junction01:11

P-N junction

736
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...
736
Modeling of Diode Forward Characteristics01:19

Modeling of Diode Forward Characteristics

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Understanding the behavior of diodes when forward-biased is a fundamental aspect of electronic circuit design and analysis. This analysis primarily utilizes two models: the exponential diode model and the constant-voltage-drop model. The exponential model comes into play when the source voltage exceeds 0.5 volts, pushing the diode current to rise exponentially above the saturation current. This relationship is graphically depicted in the current-voltage (I-V) curve, illustrating the diode's...
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Modeling of Diode Reverse Characteristics01:14

Modeling of Diode Reverse Characteristics

410
In electronic circuits, reverse-biased diode configurations are critical for regulating voltage levels. Zener diodes exploit the reverse breakdown phenomenon and exhibit a controlled breakdown at a specific Zener voltage (VZ). They are designed to maintain a constant voltage across their terminals and are commonly used for voltage regulation in circuits.
When a reverse voltage applied to a Zener diode exceeds its breakdown voltage, the diode enters the breakdown region. At this point, the...
410

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Nonalloy Model-Based Ternary Organic Solar Cells.

Yongfeng Ni1,2, Xuan Liu2, Yang Liu2

  • 1School of Chemical and Materials Science, University of Science and Technology of China, Jinzhai Road 96, Hefei 230026, P. R. China.

ACS Applied Materials & Interfaces
|March 1, 2022
PubMed
Summary

A novel nonalloy model for ternary organic solar cells (OSCs) improves efficiency and stability. This approach uses a third component with moderate miscibility, enhancing morphology and doping tolerance for high-performance devices.

Keywords:
doping tolerancemiscibilitynonalloy modelorganic photovoltaicsternary organic solar cells

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Ternary blending in organic solar cells (OSCs) using an alloy-like model is effective for high efficiency.
  • However, excellent miscibility of the third component can negatively impact the active layer, especially at high doping ratios.

Purpose of the Study:

  • To introduce a new nonalloy model for ternary OSCs.
  • To investigate the effect of moderate miscibility of the third component on active layer morphology and device performance.

Main Methods:

  • Developed a nonalloy model for ternary OSCs using the PM6:Y6 system.
  • Synthesized a Y6 analogue, BTP-MCA, as the third component.
  • Investigated the morphological stability and performance of the ternary blend.

Main Results:

  • The nonalloy model maintained excellent initial morphology and enhanced morphological stability.
  • Ternary OSCs achieved a power conversion efficiency of 17.0% with a high open-circuit voltage of 0.87 V.
  • Devices demonstrated high doping tolerance (maintaining high efficiency at 50% doping) and improved stability.

Conclusions:

  • The nonalloy model offers a promising alternative to the conventional alloy-like model for fabricating efficient and stable ternary OSCs.
  • Moderate miscibility of the third component, distributing at domain interspaces, is key to success.
  • This strategy enhances morphological stability and doping tolerance in organic solar cells.