I have written quite a few posts on this topic before. I believe some of the key questions concerning charge transport in molecular materials are:
- What is the mechanism of charge transport?
- What is the origin of the observed electric field dependent mobility?
- What determines the relative magnitude of electron and hole mobilities?
- How does mobility depend on the intermolecular separation and relative orientation?
- Would thermopower measurements be helpful in determining the charge transport mechanism?
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