期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 5, 期 15, 页码 2717-2722出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz501336r
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资金
- Israel Strategic Alternative Energy Foundation (I-SAEF)
- Adams Fellowship Program of the Israel Academy of Sciences and Humanities
- Leona M. and Harry B. charitable trust
- Weizmann institute Alternative Energy Research Initiative
- Crown center of Photonics
Significant overpotentials between the sensitizer and both the electron and hole conductors hamper the performance of sensitized solar cells, leading to a reduced photovoltage. We show that by using properly designed type-II quantum dots (QDs) between the sensitizer and the hole conductor in thin absorber cells, it is possible to increase the open circuit voltage (V-oc) by more than 100 mV. This increase is due to the formation of a photoinduced dipole (PID) layer. Photogenerated holes in the type-II QDs are retained in the core for a relatively long time, allowing for the accumulation of a positively charged layer. Negative charges are, in turn, injected and accumulated in the TiO2 anode, creating a dipole moment, which negatively shifts the TiO2 conduction band relative to the electrolyte. We study this phenomenon using a unique TiO2/CdSe/(ZnSe:Te/CdS)/polysulfide system, where the formation of a PID depends on the color of the illumination. The PID concept thus introduces a new design strategy, where the operating parameters of the solar cell can be manipulated separately.
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