[19p-E317-1~20] 9.2 Nanoparticles, Nanowires and Nanosheets

▼ [19p-E317-16] Hierarchical Assembly of Colloidal Lead Chalcogenide Nanocrystals for High Carrier Accumulation in Electrical Double Layers Capacitor

〇(D)Ricky Dwi Septianto^1,2, Liming Liu³, Ferry Iskandar⁴, Nobuhiro Matsushita², Yoshihiro Iwasa^1,3, Satria Zulkarnaen Bisri^1,2 (1.RIKEN CEMS, 2.Tokyo Inst. of Tech., 3.The Univ. of Tokyo, 4.Bandung Inst of Tech)

Keywords:Nanocrystal assembly, Charge carrier accumulation, Hierarchical porous structure

The solution-processable semiconductor colloidal nanocrystals (NCs) offers attractive properties beyond their bulk which is attributed to the size-dependent band-gap due to the quantum confinement effect of the electron wave function. Moreover, the finite density of state (discrete energy level) of NCs materials can emerge the formation of quantum capacitance that has a much higher value compared to the bulk capacitance. Here we demonstrate the measurement of the carrier accumulation on the controllable crosslinked assembly of colloidal lead sulfide (PbS) NCs.The morphology of the PbS NCs assembly was controlled by different deposition methods which provide a superlattice to the hierarchical porous structure of the NCs assembly by liquid/air interfacial assembly and dip-coating method, respectively. The carrier accumulation at the interface of ionic-liquid/NCs assembly was evaluated by electrolyte-gated field effect transistor (FET) through the displacement current measurement (DCM) and cyclic voltammetric measurement of electrical double layer (EDL) capacitor structure.