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Solution-processed organic photovoltaic cells based on a squaraine dye
Guo Chen1, Hisahiro Sasabe, Zhongqiang Wang
1Department of Organic Device Engineering, Graduate School of Science and Engineering, Research Center for Organic Electronics (ROEL), Yamagata University, Yonezawa, Yamagata, Japan.
Physical Chemistry Chemical Physics : PCCP
|October 4, 2012
Summary
This study explores squaraine (SQ) as an electron donor in organic photovoltaic cells. Optimized conditions yielded a 5.1% power conversion efficiency, highlighting SQ
Area of Science:
- Materials Science
- Organic Electronics
- Photovoltaics
Background:
- Organic photovoltaic cells offer a promising alternative to traditional silicon-based solar cells.
- Electron donor materials are crucial components in determining the efficiency of organic photovoltaic devices.
- Squaraine (SQ) derivatives are being investigated for their potential in organic electronics.
Purpose of the Study:
- To systematically investigate 2,4-bis[4-(N,N-diisobutylamino)-2,6-dihydroxyphenyl] squaraine (SQ) as an electron donor in solution-processed photovoltaic cells.
- To understand the factors limiting charge transport and power conversion efficiency.
- To explore the potential of SQ and its analogs for organic photovoltaic applications.
Main Methods:
- Solution processing of photovoltaic cells using SQ as an electron donor.
- Performance characterization under AM1.5G 1 sun illumination at room temperature and elevated temperatures.
- Purity assessment of the synthesized SQ compound.
Main Results:
- Power conversion efficiency (PCE) exceeding 4.0% was achieved at room temperature.
- Efficiency improved to 5.1% at 80 °C, primarily due to enhanced photocurrent extraction.
- Low charge carrier mobilities were identified as a limiting factor in bulk heterojunctions.
- The synthesized SQ compound demonstrated high purity, suitable for direct use in photovoltaic cells.
Conclusions:
- SQ is a viable electron donor for solution-processed organic photovoltaic cells.
- Elevated temperatures can significantly improve device performance by enhancing charge extraction.
- The simple synthesis and high purity of SQ make it an attractive candidate for further development in organic photovoltaics.
