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Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer
Published on: January 10, 2017
Improving the all-polymer solar cell performance by adding a narrow bandgap polymer as the second donor
Kai Wang1, Sheng Dong2, Xudong Chen3
1Center for Advanced Low-Dimension Materials, State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University Shanghai 201620 China mwang@dhu.edu.cn huangj@dhu.edu.cn.
Researchers developed ternary all-polymer solar cells using two donor polymers (PF2, PM2) and an N2200 acceptor. Optimizing the donor ratio achieved a 6.90% power conversion efficiency (PCE), surpassing binary devices.
Area of Science:
- Materials Science
- Organic Electronics
- Photovoltaics
Background:
- All-polymer solar cells (APSCs) offer flexibility and low-cost manufacturing potential.
- Ternary blends in APSCs can enhance light absorption and charge generation.
- Optimizing donor-acceptor ratios is crucial for device performance.
Purpose of the Study:
- To fabricate and characterize ternary all-polymer solar cells.
- To investigate the effect of complementary absorption from two donor polymers on device performance.
- To demonstrate an effective strategy for improving APSC efficiency.
Main Methods:
- Fabrication of ternary all-polymer solar cells using N2200 acceptor and PF2/PM2 donors.
- Tuning the ratio of donor polymers (PF2:PM2:N2200) to optimize performance.
- Characterization of device performance, including power conversion efficiency (PCE).
Main Results:
- The ternary device with a PF2:PM2:N2200 ratio of 9:1:5 achieved a PCE of 6.90%.
- The optimized ternary device outperformed binary devices composed of individual donors and the acceptor.
- The addition of PM2 enhanced light harvesting in the near-infrared region.
Conclusions:
- Ternary APSCs incorporating a wide bandgap donor (PF2) and a narrow bandgap donor (PM2) with complementary absorption improve overall device performance.
- Careful tuning of the donor polymer ratio is essential for maximizing PCE.
- This approach offers a viable strategy for enhancing the efficiency of all-polymer solar cells.
