PHILADELPHIA –- For centuries, engineers have bent and torn metals to test their strength and ductility. Now, materials scientists at the University of Pennsylvania School of Engineering and Applied ...
When indented by a probe in darkness, wafers of some semiconductors are putty-like. When illuminated by light whose wavelength matches the band gap, they become hard, as electrons and holes freed by ...
Colloidal quantum dots (CQDs) are semiconducting crystals. They exist on a nanometer scale (ca. 2–12 nm) and are coated with ligand/surfactant molecules to avoid agglomeration. Due to their size, CQDs ...
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