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High open-circuit voltage solid-state dye-sensitized solar cells with organic dye
Peter Chen1, Jun Ho Yum, Filippo De Angelis
1Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, School of Basic Sciences, Swiss Federal Institute of Technology, CH - 1015 Lausanne, Switzerland.
Nano Letters
|May 15, 2009
Summary
Solid-state dye-sensitized solar cells achieved over 1V open-circuit potential using the JK2 organic dye. This high voltage is attributed to a favorable dipolar field effect on the TiO(2) surface, enhancing device performance.
Area of Science:
- Materials Science
- Photovoltaics
- Organic Electronics
Background:
- Solid-state dye-sensitized solar cells (ssDSSCs) are a promising photovoltaic technology.
- Achieving high open-circuit potential (V(oc)) is crucial for efficient solar energy conversion.
- Organic dyes offer tunable properties for optimizing ssDSSCs.
Purpose of the Study:
- To investigate the origin of the high open-circuit potential (V(oc)) in ssDSSCs fabricated with the JK2 organic dye.
- To understand the interfacial interactions between the JK2 dye and the TiO(2) semiconductor surface.
- To compare the interfacial effects of JK2 with traditional heteroleptic ruthenium(II) dyes.
Main Methods:
- Fabrication of ssDSSCs using the novel organic dye JK2.
- Measurement of transient open-circuit potential (V(oc)) decay.
- Density functional theory (DFT) calculations to model dye/semiconductor interactions.
Main Results:
- The JK2 dye enabled ssDSSCs to achieve an open-circuit potential exceeding 1 V.
- Transient V(oc) decay measurements provided insights into charge carrier dynamics.
- DFT calculations revealed a negative conduction band shift at the TiO(2) surface due to JK2's dipolar field.
- This dipole effect contrasts with the opposite effect observed for heteroleptic Ru(II)-dyes.
Conclusions:
- The JK2 organic dye significantly enhances V(oc) in ssDSSCs through a favorable interfacial dipole.
- The observed negative conduction band shift is key to achieving high voltages.
- Understanding these interfacial effects is vital for designing next-generation high-performance organic solar cells.
