190. DNA MEDIATED 3D ASSEMBLY OF NANOPARTICLES FOR THIN FILM SOLAR CELL FABRICATION

Department: NanoEngineering
Research Institute Affiliation: Graduate Program in Materials Science and Engineering
Faculty Advisor(s): Jennifer Cha

Primary Student
Name: Hyunwoo Noh
Email: hwnoh@ucsd.edu
Phone: 858-246-0983
Grad Year: 2013

Abstract
Self-assembly is an attractive processing method for nanoengineering as it allows manipulating materials into designed architectures at low cost and high throughput. Among the different modes of self-assembly, the use of DNA is appealing because it enables constructing different crystal structures simply by changing the DNA sequences used. We show here 3-D body-centered-cubic (BCC) superlattices of gold nanoparticles assembled on silicon using two different DNAs conjugated gold nanoparticles and surface adsorbed DNA. By combining surface patterned DNA to capture the nanoparticles and two distinct DNA oligonucleotide sequences designed to drive the particles to order in the confined space, 3-D BCC arrangements of nanoparticles could be obtained. Film thicknesses were controlled from 20nm to 80nm by changing the initial gold nanoparticle concentration. In addition, quantum dot-DNA conjugation was further studied as an alternative for gold nanoparticles. Successful transfer of the initial organic soluble QDs followed by DNA conjugation was verified by both UV Vis absorbance, gel electrophoresis and TEM. These DNA-QDs are being explored as building blocks to fabricate thin film heterojunction based solar cells.

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