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Fulleropyrrolidine interlayers: tailoring electrodes to raise organic solar cell efficiency
Zachariah A Page1, Yao Liu1, Volodimyr V Duzhko2
1Polymer Science and Engineering Department, University of Massachusetts, Amherst, MA 01003, USA.
Science (New York, N.Y.)
|September 20, 2014
Summary
Researchers developed novel buffer layers for organic solar cells, overcoming the challenge of balancing stability and work function. These fulleropyrrolidine layers enable high power conversion efficiencies regardless of cathode material choice.
Area of Science:
- Materials Science
- Organic Electronics
- Photovoltaics
Background:
- Organic solar cells face a critical challenge: the trade-off between cathode work function and oxidative stability.
- Existing methods often compromise either device performance or longevity.
Purpose of the Study:
- To overcome the work function and stability trade-off in organic solar cell design.
- To introduce solution-processable buffer layers that are independent of cathode selection.
Main Methods:
- Incorporation of fulleropyrrolidines with amine (C60-N) or zwitterionic (C60-SB) substituents as buffer layers.
- Fabrication of single-junction polymer solar cells using these buffer layers.
- Characterization of effective work function reduction and power conversion efficiency (PCE).
Main Results:
- A thin layer of C60-N effectively reduced the work function of Ag, Cu, and Au electrodes to 3.65 eV.
- Power conversion efficiencies exceeding 8.5% were achieved for organic photovoltaics using various cathode materials (Al, Ag, Cu, Au).
- High efficiencies were maintained with C60-N and C60-SB buffer layers ranging from 5 to 55 nm, indicating tolerance to thickness variations.
Conclusions:
- Solution-based fulleropyrrolidine buffer layers (C60-N, C60-SB) effectively surmount the cathode work function and stability challenge.
- These buffer layers enable high-efficiency organic solar cells independent of cathode material choice and interlayer thickness.
- This approach offers a versatile strategy for advancing organic photovoltaic device design and performance.
