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Layer-by-Layer Processed Ternary Organic Photovoltaics with Efficiency over 18.

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Researchers developed a new method for organic photovoltaics (OPVs) using a layer-by-layer (LbL) process and ternary strategy. This approach creates a vertical phase distribution, significantly boosting device efficiency and charge collection.

Keywords:
bulk-heterojunctionslayer-by-layer assemblymiscibilityternary organic photovoltaicsvertical phase distributions

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Achieving optimal active layer morphology is crucial for efficient charge generation and extraction in organic photovoltaics (OPVs).
  • Existing methods often struggle to precisely control nanoscale morphology for enhanced performance.

Purpose of the Study:

  • To introduce a novel approach combining layer-by-layer (LbL) processing and a ternary strategy to engineer active layer morphology in OPVs.
  • To demonstrate the benefits of vertical phase distribution for improved charge dynamics and device efficiency.

Main Methods:

  • Utilizing a layer-by-layer (LbL) deposition technique.
  • Incorporating an asymmetric electron acceptor (BTP-S2) into a binary host (PM6:BO-4Cl) to form a ternary blend.
  • Analyzing the resulting morphology and device performance.

Main Results:

  • The LbL-type ternary strategy successfully created a vertical phase distribution, with donor enrichment near the anode and acceptor enrichment near the cathode.
  • This morphology suppressed charge recombination and enhanced charge collection compared to binary LbL OPVs.
  • The ternary OPVs achieved a power conversion efficiency of 18.16% (certified 17.8%).

Conclusions:

  • The synergistic combination of LbL processing and ternary strategy offers an effective route to control morphology and enhance OPV performance.
  • Vertical phase distribution is a key factor in reducing recombination and improving charge collection.
  • This method presents a promising pathway for the industrial production of high-efficiency OPVs.