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Related Concept Videos

P-N junction01:11

P-N junction

1.5K
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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Biasing of P-N Junction01:16

Biasing of P-N Junction

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The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

1.2K
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
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Related Experiment Video

Updated: Mar 6, 2026

Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer
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Single-Junction Binary-Blend Nonfullerene Polymer Solar Cells with 12.1% Efficiency.

Fuwen Zhao1,2, Shuixing Dai1,3, Yang Wu4

  • 1Department of Materials Science and Engineering, College of Engineering, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University, Beijing, 100871, China.

Advanced Materials (Deerfield Beach, Fla.)
|March 16, 2017
PubMed
Summary

A novel fluorinated nonfullerene acceptor, ITIC-Th1, enhances organic solar cell performance. This material boosts power conversion efficiency to 12.1% due to improved light harvesting and electron mobility.

Keywords:
fluorinationfused-ring electron acceptorsnonfullerenepolymer solar cells

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Nonfullerene acceptors are crucial for advancing organic solar cells (OSCs).
  • Fluorination is a strategy to tune electronic properties and intermolecular interactions of organic semiconductors.
  • Optimizing molecular design is key to enhancing OSC performance and stability.

Purpose of the Study:

  • To design and synthesize a new fluorinated nonfullerene acceptor, ITIC-Th1.
  • To investigate the effects of fluorine incorporation on the electronic and optical properties of the acceptor.
  • To evaluate the performance of OSCs utilizing ITIC-Th1 in conjunction with a polymer donor.

Main Methods:

  • Chemical synthesis of the fluorinated nonfullerene acceptor ITIC-Th1.
  • Spectroscopic and electrochemical characterization to determine optical bandgap and energy levels.
  • Fabrication and testing of single-junction binary-blend OSCs using ITIC-Th1 and a polymer donor (FTAZ).

Main Results:

  • Fluorinated ITIC-Th1 exhibited redshifted absorption, a smaller optical bandgap, and enhanced electron mobility compared to its nonfluorinated counterpart.
  • OSCs based on FTAZ:ITIC-Th1 achieved a power conversion efficiency (PCE) of 12.1%, surpassing nonfluorinated ITIC-Th (8.88%) and conventional fullerene acceptors (e.g., PC71BM, 5.22%).
  • The optimized OSCs demonstrated superior efficiency and stability.

Conclusions:

  • Fluorine incorporation in nonfullerene acceptors effectively modulates molecular interactions and energy levels, leading to improved OSC performance.
  • ITIC-Th1 represents a highly efficient electron acceptor for next-generation organic solar cells.
  • The achieved PCE of 12.1% sets a new benchmark for single-junction binary-blend OSCs.