31-10-2013 дата публикации
Номер: US20130284249A1
Composite materials useful for devices such as photoelectrochemical solar cells include a substrate, a metal oxide film on the substrate, nanocrystalline quantum dots (NQDs) of lead sulfide, lead selenide, and lead telluride, and linkers that attach the NQDs to the metal oxide film. Suitable linkers preserve the 1s absorption peak of the NQDs. A suitable linker has a general structure A-B-C where A is a chemical group adapted for binding to a MOand C is a chemical group adapted for binding to a NQD and B is a divalent, rigid, or semi-rigid organic spacer moiety. Other linkers that preserve the 1s absorption peak may also be used. 1. An article comprising:a substrate,a metal oxide film on the substrate,quantum dots selected from PbS, PbSe, and PbTe, a linker having the structure A-B-C wherein A is a chemical group suitable for chemical bonding to the metal oxide film, wherein C is a chemical group suitable for chemically bonding to quantum dot, and wherein B is a rigid or semi-rigid spacer group covalently bonded to A and to C,', 'a linker having the structure D-E-G wherein D includes silicon, G is —SH, and E is divalent chemical moiety spacer group covalent bonded to D and to G, and', {'sub': '2', 'a linker selected from (HOOC—CR—CH(COOH)(SH) or a carboxylate salt thereof,'}], 'a linker that chemically attaches the quantum dots to the metal oxide film, the linker being selected fromwherein R is selected from H, alkyl, branched alkyl, cycloalkyl, —F, —Cl, —Br, —I, aryl, substituted aryl, alkenyl, substituted alkynyl, —CN, —OH, —COOH, and COO—.2. The article of claim 1 , wherein the metal oxide comprises a transition metal.3. The article of claim 2 , wherein the metal oxide is a mixed metal oxide.4. The article of claim 1 , wherein the metal oxide comprises a dopant.5. The article of claim 1 , wherein the metal oxide is titanium oxide (TiO) claim 1 , tin oxide (SnO) claim 1 , zinc oxide (ZnO) claim 1 , tungsten oxide (WO) claim 1 , niobium oxide (NbO) claim 1 , ...
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