NPaMS_l6

Schockley–Queisser limit describes the efficiency

• of solar cells in general.
• of single pn junctions
• of single pn junctions illuminated by sun
• of pn junctions illuminated by sun with carrier multiplication.

Multijunction cells

• are widely used due to their large efficiency.
• have higher efficiency, since they enhance e relaxation.
• capture high energy photons first.
• fullfills the Schockley–Queisser limit.

The information depth of Auger electron spectroscopy is determined by

• the pressure in the analytical chamber
• the temperature
• The inelastic mean free path of electrons in the sample

XPS determines chemical binding states from

• the formation of organic fragment ions
• peak positions
• temperature increase in the sample

Which method is the most sensitive?

• XPS
• SIMS
• AES

Which method has the smallest information depth?

• XPS
• SIMS
• AES

The kinetic energy of photoelectrons depend on the energy of the X-ray photons

• True
• False

In SIMS the presence of oxygen

• decreases the ion yield
• increases the positive ion yield
• increases the negative ion yield

In Auger electron spectroscopy peak shapes give information about

• the layer thickness
• the pressure in the analytical chamber
• chemical binding states

SIMS can identify organic componds based on

• their organic fragment ions
• the energy of the secondary ions
• the energy of the secondary electrons