Accession Number:

ADA585157

Title:

Hierarchial Junction Solar Cells Based on Hyper-Branched Semiconductor Nanocrystals

Descriptive Note:

Final rept. 15 Jul 2006-30 Jun 2009

Corporate Author:

CALIFORNIA UNIV BERKELEY

Personal Author(s):

Report Date:

2009-06-30

Pagination or Media Count:

10.0

Abstract:

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.

Subject Categories:

  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE