Hierarchial Junction Solar Cells Based on Hyper-Branched Semiconductor Nanocrystals
Final rept. 15 Jul 2006-30 Jun 2009
CALIFORNIA UNIV BERKELEY
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In the first phase, hyperbranched nanocrystals of Cadmium Selenide CdSe were synthesized, isolated, and characterized. During active research on CdSe nanostructure-based solar cells, toxicity and processing complexity issues were encountered. The research was redirected to find non-toxic and abundant materials. It was determined that copper I sulfide and iron disulfide pyrite generated a much broader impact for photovoltaic solar cell applications. First, a simple low temperature solution phase synthesis of copper I sulfide nanocrystals was demonstrated. An all-inorganic bilayered solar cell device based on these nanocrystals and CdS nanorods demonstrated power efficiencies of about 1.6. Second a novel single source precursor approach was established to synthesize pure phase iron disulfide pyrite nanocrystals with high purity through a surfactant-assisted hydrothermal reaction. These nanocrystals represent new groups of well-defined nanoscale structures for high-performance photovoltaic solar cells based on non-toxic and earth abundant materials.
- Solid State Physics