Carrier Transport in PbS Nanocrystal Conducting Polymer Composites

Details Carrier Transport in PbS Nanocrystal Conducting Polymer Composites Carrier Transport in PbS Nanocrystal Conducting Polymer Composites

2004-12-13

arxiv.org/abs/cond-mat/0412307v1

Physics

Condensed Matter

Materials Science

7 pages, 5 figures

Scientific paper

10.1063/1.2140885

In this paper we report the first measurements of carrier mobilities in an inorganic nanocrystal: conducting polymer composite. The composite material in question (lead sulphide nanocrystals in the conducting polymer MEH-PPV was made using a new single-pot, surfactant-free synthesis. Mobilties were measured using time of flight (ToF) and steady-state techniques. We have found that the inclusion of PbS nanocrystals in MEH-PPV both balances and markedly increases the hole and electron mobilities - the hole mobility is increased by a factor of ~105 and the electron mobility increased by ~107 under an applied bias of 5kVcm-1. These results explain why dramatic improvements in electrical conductivity and photovoltaic performance are seen in devices fabricated from these composites.

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