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Toward Current Matching in Tandem Dye-Sensitized Solar Cells
Junfeng Wei1, Zhipeng Shao1, Bin Pan1
1Key Laboratory of Photovoltaic and Energy Conservation Materials, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
Materials (Basel, Switzerland)
|July 8, 2020
Summary
Tandem pn-type dye-sensitized solar cells (pn-DSCs) show potential for higher efficiencies. This study reveals that the short-circuit current density in pn-DSCs is primarily limited by the photoanode
Area of Science:
- Photovoltaic technologies
- Materials science
- Renewable energy
Background:
- Tandem pn-type dye-sensitized solar cells (pn-DSCs) are investigated for their potential to surpass the Shockley-Queisser efficiency limit of single-junction devices.
- Understanding the factors influencing short-circuit current densities (Jsc) in pn-DSCs is crucial for optimizing their performance.
Purpose of the Study:
- To clarify the governing factors of short-circuit current densities (Jsc) in tandem pn-type dye-sensitized solar cells (pn-DSCs).
- To investigate the relationship between the photocurrents of individual photoelectrodes and the overall Jsc of the pn-DSC.
Main Methods:
- Experimental investigation of pn-DSC performance.
- Development and application of a simplified series circuit model for simulation.
Main Results:
- Contrary to common belief, the Jsc of pn-DSCs is determined by the photoanode's Jsc, not the photocathode's.
- A breakdown in the photocathode occurs when its photocurrent exceeds its threshold voltage, causing an abrupt increase in circuit Jsc.
- Optimal pn-DSC photoconversion efficiency requires nearly equivalent photocurrents from both photoelectrodes.
Conclusions:
- The photocurrent generation and transport mechanisms in pn-DSCs are more complex than previously assumed.
- Achieving high efficiency in pn-DSCs necessitates careful matching of the photoanode and photocathode performance.
- Further research should focus on optimizing individual photoelectrode properties to achieve balanced photocurrents for enhanced overall device performance.
