The control of the Fermi level has been essential to the development of semiconductors and the control of the Fermi level of colloidal quantum dots is also likely to be significant.  The stable occupation of the quantum dot states is first easily identified by strong electrochromic effects.   One consequence is that charged dots, trions, allow easier lasing than biexcitons.    More significantly, controlling the Fermi level allows ohmic conductivity in assemblies of colloidal dots via the quantum states.  The results obtained with charge injection should therefore be used to benchmark current efforts to introduce donors or acceptors.  In this talk, I will review work that led to charged, electrochromic and conducting colloidal dots, and present results on single charge optical microscopy, basic studies of electrical transport, and the recent extension of colloidal dots for mid-infared devices.

Charges in colloidal quantum dots

244th National Meeting (2012)

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