Ge

1
Ge TiO2 Quantum Dots (QD) Nanocomposites for
Solar Cell ApplicationsIsmat S. Shah, University
of Delaware, DMR 0441619

• A new type of solar cell, called Gratzel cell,
  involves oxide nanoparticles with large band
  gaps.
• Since the bandgap is large, they can only absorb
  the small high energy (UV) part of the solar
  spectrum.
• Gratzel cells use dyes that helps in absorbing
  the visible part of the sun light.
• In our work germanium quantum dots are used. By
  changing the size of the quantum dots, we can
  change the absorption characteristics and make it
  absorb all the way from low energy infrared to
  the high energy near-UV light.
• This will increase the absorption efficiency of
  the solar cells made from this material.

Fourier Transform of the lattice image to obtain
diffraction pattern form the Ge nanodot. Compare
with the diffraction pattern from Ge nanowires
(b).
2
Getting Involved Undergraduate and High School
Student Participation Ismat S. Shah, University
of Delaware, DMR 0441619

• In addition to two graduate students, one high
  school student, and 3 undergraduate students are
  participating in the research associated with
  this project. One undergraduate and one high
  school student are co-authors on one of the
  papers that describes the results of this
  research.

1. Effect of Annealing Temperature on TiO2
Nanoparticle Photoactivity S. Buzby, Hailey
Guerriero, Josh Morris-Levenson, Emre Yassitepe,
S. Ismat Shah To be submitted to JMR. 2. Ge
doping of TiO2 Nanoparticles S. Buzby, Hailey
Guerriero, Y. Miao, S. Ismat Shah Under
preparation.