Question
Two answers required. Energy conduction in organic photovoltaics occurs via dissociation of bound states of these two particles at donor-acceptor interfaces. For 10 points each:
[10m] Name these two types of particles that form hydrogen-like bound states called excitons. These two types of particles are respectively introduced by N-type and P-type doping.
ANSWER: electrons AND holes [accept electron holes for holes]
[10h] Excitons with large Bohr radii, typically found in semiconductors, are co-named for this physicist and Mott. A set of orthogonal functions named for this physicist are Fourier transforms of Bloch states, and are analogous to localized orbitals for crystals.
ANSWER: Gregory Wannier [accept Wannier-Mott orbital or Wannier functions]
[10e] Exciton spectral lines are typically thin, and have energy below the namesake “gap” between these regions. Electrons may occupy the “valence” or “conduction” examples of these regions.
ANSWER: bands [or energy bands; accept valence band or conduction band; accept band gap]
<JZ, Physics>
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