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High-Performance Small Molecule/Polymer Ternary Organic Solar Cells Based on a Layer-By-Layer Process.

Weichao Chen1, Zhengkun Du1, Manjun Xiao1

  • 1CAS Key Laboratory of Bio-based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences , Qingdao 266101, China.

ACS Applied Materials & Interfaces
|October 6, 2015
PubMed
Summary

A novel layer-by-layer method enhances ternary blend organic solar cells by incorporating small molecules into polymer active layers. This approach achieves high power conversion efficiency (PCE) through improved light harvesting and balanced charge transport.

Keywords:
crystallinelayer-by-layerpolymerssmall moleculesternary blend solar cells

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Organic solar cells (OSCs) are promising for renewable energy.
  • Ternary blends offer potential for improved performance over binary systems.
  • Fabrication methods are crucial for optimizing OSC efficiency.

Purpose of the Study:

  • To develop a layer-by-layer fabrication method for highly efficient ternary blend organic solar cells.
  • To investigate the effect of incorporating small molecules into polymer-based active layers.
  • To achieve high power conversion efficiency (PCE) without extensive morphology optimization.

Main Methods:

  • Utilized a layer-by-layer (LbL) process for fabricating ternary blend organic solar cells.
  • Incorporated small molecules as a donor material onto a poly(3,4-ethylenedioxy-thiophene):poly(styrenesulfonate) (PEDOT:PSS) layer.
  • Spin-coated a polymer and fullerene derivative mixture on top of the small molecule layer.

Main Results:

  • Achieved a high power conversion efficiency (PCE) of 8.76% without further morphology optimization.
  • Obtained a large short-circuit current density (Jsc) of 17.24 mA cm(-2).
  • Reported a high fill factor (FF) of 0.696.

Conclusions:

  • The layer-by-layer method effectively integrates small molecules in crystalline states within the active layer.
  • The enhanced PCE is attributed to improved light harvesting and more balanced charge transport.
  • This fabrication strategy offers a pathway to highly efficient ternary blend organic solar cells.