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Solution-processable graphene oxide as an efficient hole transport layer in polymer solar cells
Shao-Sian Li1, Kun-Hua Tu, Chih-Cheng Lin
1Department of Materials Science and Engineering, National Taiwan University, Taipei 106, Taiwan.
ACS Nano
|May 21, 2010
Summary
Graphene oxide thin films improve organic photovoltaics (OPVs) by acting as an effective hole transport and electron blocking layer. This enhances device efficiency, offering a promising alternative to PEDOT:PSS.
Area of Science:
- Materials Science
- Nanoscience
- Organic Electronics
Background:
- Organic photovoltaics (OPVs) rely on efficient charge transport layers.
- PEDOT:PSS is a common but sometimes problematic hole transport layer.
- Graphene oxide (GO) is a novel material with potential electronic applications.
Purpose of the Study:
- To investigate the use of graphene oxide (GO) thin films as a hole transport and electron blocking layer in OPVs.
- To evaluate the impact of GO on charge recombination and device efficiency.
- To compare GO's performance against conventional materials like PEDOT:PSS.
Main Methods:
- Fabrication of OPVs incorporating GO thin films.
- Deposition of GO from neutral solutions between active and electrode layers.
- Characterization of device performance, including efficiency and leakage currents.
Main Results:
- GO incorporation significantly reduced electron-hole recombination and leakage currents.
- OPV efficiencies increased dramatically with GO, reaching levels comparable to PEDOT:PSS devices.
- GO demonstrated effective hole transport and electron blocking capabilities.
Conclusions:
- Graphene oxide is a viable and effective hole transport and electron blocking layer for OPVs.
- GO offers a simple, solution-processable alternative to PEDOT:PSS.
- This finding has implications for improving OPV and organic light-emitting diode (OLED) device performance.
