[15p-F206-1~14] 22.1 Joint Session M

▲ [15p-F206-4] Colloidal Quantum Dot Arrays for Thermoelectric Devices

〇Satria Zulkarnaen Bisri¹, Daiki Shin², Sunao Shimizu¹, Maria Ibanez^3,4, Maksym Kovalenko^3,4, Yoshihiro Iwasa^1,2 (1.RIKEN CEMS, 2.Univ. Tokyo, 3.ETH Zurich, 4.EMPA)

Keywords:colloidal quantum dots, electric double layer gating, decoupling of electronic and thermal transport

Nanomaterials is one of the most promising building blocks that may overcome the challenges to develop high performance thermoelectric materials. . Lead chalcogenide colloidal quantum dots, either PbS and PbTe QDs are among the most prospective materials sought for this direction, because of its natural abundance and its known superb thermoelectric properties in its bulk form, respectively. In this presentation, we show the importance of charge-density control on PbS and PbTe CQD assemblies by field-induced doping utilizing electric-double-layer (EDL) gating to access the discrete energy levels of the quantum confinement effect of these materials. The preservation of the discrete energy levels, indicated by the sharp electronic density of states, despite the large scale array of the assembly might enable us to expect the observation of high Seebeck coefficient when we access them.