PbSe Nanocrystal Solids for n- and p-Channel Thin Film Field-Effect Transistors

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Science  07 Oct 2005:
Vol. 310, Issue 5745, pp. 86-89
DOI: 10.1126/science.1116703

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Initially poorly conducting PbSe nanocrystal solids (quantum dot arrays or superlattices) can be chemically “activated” to fabricate n- and p-channel field effect transistors with electron and hole mobilities of 0.9 and 0.2 square centimeters per volt-second, respectively; with current modulations of about 103 to 104; and with current density approaching 3 × 104 amperes per square centimeter. Chemical treatments engineer the interparticle spacing, electronic coupling, and doping while passivating electronic traps. These nanocrystal field-effect transistors allow reversible switching between n- and p-transport, providing options for complementary metal oxide semiconductor circuits and enabling a range of low-cost, large-area electronic, optoelectronic, thermoelectric, and sensing applications.

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