Conductivity, electronic doping

There exist numerous conjugated macromolecules showing high electronic conductivities after doping. Materials thus prepared are also termed synthetic metals (their significance is documented, for example, by the existence of a journal of the same name). This section presents only a very brief summary of this constantly growing field. Further information can be found in numerous reviews and monographs the most representative ones are listed below. 

Charge transport through an array of semiconductor nanocrystals is strongly affected by the electronic structure of nanocrystal surfaces. It is possible to control the type of conductivity and doping level of quantum dot crystals by adsorbing/desorbing molecular species at the nanocrystal surface. As an... 

The resulting materials have approximately equal ionic and electronic contributions to the total conductivity at doping levels between Ce0.8Pro.202-s and Ce0.75Pr0.25O2-s. The electronic conductivity mechanism in these oxides is believed to be by way of electron hopping between Pr4+ and Pr3+. 

The two-phase nature of all ceramic samples of the electron-doped superconductors probably accounts for their less desirable properties, including low Meissner fractions in many samples, low and nonmetallic conductivity in the normal state, and... 

Polyaromatic sodium lignosulfonate and sulfur lignin resin can be made conducting by doping. The conductivity increases by several decades through doping with electron acceptors and donors as shown in Table IV. 

In conclusion it can be stated that the p- and -type dark conductivity of doped dyes and a number of undoped dyes is the result of differences in the densities of holes and electrons. Thus, in -type dyes we have p n, and in n-... 

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