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Related Concept Videos

P-N junction01:11

P-N junction

953
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...
953

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Ambient Method for the Production of an Ionically Gated Carbon Nanotube Common Cathode in Tandem Organic Solar Cells
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A Low-Temperature Solution-Processed CuSCN/Polymer Hole Transporting Layer Enables High Efficiency for Organic Solar

Jiale Dong1, Jian Guo1, Xiaoliang Wang1

  • 1Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China.

ACS Applied Materials & Interfaces
|September 18, 2020
PubMed
Summary

A new bilayer hole transporting layer (HTL) of copper(I) thiocyanate (CuSCN) and poly[(9,9-dioctylfluorenyl-2,7-diyl)-alt-(4,4

Keywords:
TFBcopper(I) thiocyanatehigh efficiencyhole transporting layersorganic solar cells

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Hole transporting layers (HTLs) are crucial for efficient charge extraction and transport in organic solar cells (OSCs).
  • Optimizing the interface between the HTL and light absorber is key to improving OSC performance.
  • Existing HTLs face challenges in balancing charge extraction, transport, and minimizing recombination losses.

Purpose of the Study:

  • To develop and evaluate a novel bilayer HTL comprising copper(I) thiocyanate (CuSCN) and poly[(9,9-dioctylfluorenyl-2,7-diyl)-alt-(4,4'-(N-(4-butylphenyl)))] (TFB).
  • To investigate the impact of the CuSCN/TFB HTL on charge extraction, interfacial properties, and photovoltaic performance in OSCs.
  • To demonstrate the potential of this new HTL for achieving high-efficiency organic solar cells.

Main Methods:

  • Fabrication of a bilayer HTL using soluble CuSCN and TFB.
  • Integration of the CuSCN/TFB HTL into organic solar cells utilizing nonfullerene (PM6:Y6) and fullerene (PTB7-Th:PC71BM) active layers.
  • Characterization of device performance, including efficiency, charge extraction, recombination, and exciton dissociation.

Main Results:

  • The CuSCN/TFB HTL demonstrated excellent charge extraction capabilities in both nonfullerene and fullerene-based OSCs.
  • Introduction of TFB effectively tuned the work function and improved interfacial contact, enhancing hole extraction.
  • Devices with CuSCN/TFB exhibited reduced recombination losses, higher exciton dissociation, and larger domain sizes, leading to a champion efficiency of 15.10%.

Conclusions:

  • The bilayer CuSCN/TFB HTL significantly enhances photovoltaic performance in OSCs compared to a pristine CuSCN HTL.
  • The improved performance is attributed to better interfacial engineering, efficient charge extraction, and reduced charge recombination.
  • CuSCN/TFB presents a promising and effective hole transporting layer for the development of high-efficiency organic solar cells.