研究目的
Investigating the use of small gold nanoparticles (GNPs) of average size ~ 15 nm on the performance of PbS and PbS/CdS-co-sensitized QDSCs.
研究成果
Gold nanoparticles of size ~ 15 nm have been used to demonstrate the plasmonic enhancement of photocurrent for PbS and PbS/CdS quantum dot-sensitized solar cells. The enhancements in photocurrent and efficiency have been observed for multiple devices and show consistent trend. Further optimization of size and concentration of the GNPs would lead to still higher efficiencies in quantum dot-sensitized solar cells.
研究不足
The size and concentration of GNPs need to be optimized to get the best performance from plasmonic QDSCs. The study suggests that further optimization could lead to higher efficiencies.
1：Experimental Design and Method Selection:
The study involved the fabrication of PbS-sensitized quantum dot solar cells (QDSC) using TiO2 and TiO2–Au plasmonic nanocomposite films by the successive ionic layer adsorption and reaction (SILAR) method. The effect of gold nanoparticles (GNPs) on the performance of QDSCs was investigated.
2：Sample Selection and Data Sources:
Fluorine-doped tin-oxide (FTO)-coated glass slides were used as substrates. Gold nanoparticles of size ~ 15 nm were synthesized and mixed with TiO2 paste for making plasmonic paste.
3：List of Experimental Equipment and Materials:
Instruments used include a Perkin Elmer Lambda 1050 spectrophotometer for UV–visible spectra, Philips system for X-ray diffraction (XRD) measurements, Tecnai G2 20 electron microscope for TEM images, and a 450 W Oriel Class AAA solar simulator and Keithley 2440 source meter for current density versus voltage curves.
4：Experimental Procedures and Operational Workflow:
The TiO2 photoanodes were prepared using a doctor blade method. The films were sensitized with PbS/ZnS or PbS/CdS/ZnS using the SILAR method. The devices were assembled with a CuS counter electrode and an electrolyte consisting of 1 M Na2S, 1 M S, and 0.1 M NaOH in DI water.
5：1 M NaOH in DI water.
Data Analysis Methods:
5. Data Analysis Methods: The photovoltaic parameters of the devices were recorded and analyzed to determine the effect of GNPs on the performance of QDSCs.
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