Abstract
Carbon quantum dots (CQDs) and their composites with the conducting polymer PEDOT: PSS were obtained by the hydrothermal method from glucose, and their electrical properties were investigated in the temperature range 77-280 K. CQDs have a globular structure with globule sizes of ~ 50 nm. The dependences of the resistivity on temperature, (T), have been obtained for the films of CQDs, PEDOT:PSS-CQDs and PEDOT: PSS, which have a weak activation character. It was found that the values of the CQD films are several orders of magnitude higher than the values of the PEDOT: PSS films. It has been shown that with an increase in the content of CQDs in the PEDOT:PSS-CQDs composites, the (T) dependences exhibit a transition from high activation energies (~ 17-18 meV), characteristic of pure PEDOT: PSS, to lower values (~ 10 meV) observed in CQD films. The mechanism of transport of charge carriers in the investigated materials is considered.
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