CsPbX -ITO (X = Cl, Br, I) Nano-Heterojunctions: Voltage Tuned Positive to Negative Photoresponse.

All-Inorganic perovskite CsPbX (X = Cl, Br, I) quantum dots (QDs) have attracted tremendous attention in the past few years for their appealing performance in optoelectronic applications. Major properties of CsPbX QDs include the positive photoconductivity (PPC) and the defect tolerance of the in-band trap states. Here it is reported that when hybridizing CsPbX QDs with indium tin oxide (ITO) nanocrystals to form CsPbX -ITO nano-heterojunctions (NHJs), a voltage tuned photoresponse-from PPC to negative photoconductivity (NPC) transform-is achieved in lateral drain-source structured ITO/CsPbX -ITO-NHJs/ITO devices.

Crystal structure of ethyl-ene-dioxy-tetra-thia-fulvalene-4,5-bis-(thiol-benzoic acid) 0.25-hydrate.

In the title compound (systematic name: 4,4'-{[2-(5,6-di-hydro-[1,3]di-thiolo[4,5-][1,4]dioxin-2-yl-idene)-1,3-di-thiole-4,5-di-yl]bis-(sulfanedi-yl)}di-benzoic acid 0.25-hydrate), CHOS·0.25HO, the tetra-thia-fulvalene (TTF) core adopts a boat conformation, where the central SC=CS plane makes dihedral angles of 31.