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| 2. |
- Lindström, H, et al.
(författare)
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Li+ ion insertion in TiO2 (anatase) .1. Chronoamperometry on CVD films and nanoporous films
- 1997
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Ingår i: JOURNAL OF PHYSICAL CHEMISTRY B. - : AMER CHEMICAL SOC. - 1089-5647. ; 101:39, s. 7710-7716
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Electrochemical insertion of lithium in nanoporous and CVD samples of TiO2 (anatase) was studied by chronoamperometry. The currents following cathodic and anodic potential steps were monitored as a function of film thickness, temperature, and electrolyte
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| 3. |
- Rensmo, Håkan
(författare)
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Dye-sensitized nanostructured metal oxide electrodes : Photoelectrochemical, quantum chemical and electron spectroscopic studies
- 1998
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Solar cells based on dye-Sensitized nanostructured electrodes are promising for solar energy conversion. High overall light-to-energy conversion efficiencies have been obtained for systems based on TiO2 (7%) and ZnO (2%). The photocurrent losses in these electrodes have been investigated by photoelectrochemical methods. Both bare and dye-sensitized TiO2 and ZnO electrodes were studied. The measurments showed that the losses in photon to current conversion efficiency were largely dependent on the electrolyte composition and penetration depth of the light. Generally the probability of losing generated charges decreased with increased travelling distancees within the nanostructured film and with the increased concentration of electron scavengers within the electrolyte.Ruthenium polypyridine complexes are presently used as light absorbers in the dye-sensitized solar cell. The electronic structure of these dyes, and of the dyes adsorbed to nanostructured TiO2 surface was investigated by means of semiempirical quantum chemical calculations and photoelectron spectroscopy. The investigation gave insight into the electronic structure involved in the light-to-energy conversion process. To date the most efficient dyes contain bi-isonicotinic acid as attaching ligand to the nanostructured surface. A semiempirical and electron spectroscopic investigation of this ligand attached to the TiO2 rutile (110) surface was performed to investigate the molecular structure at the surface. An adsorption configuration with four equivalent oxygen bridges was proposed.
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| 4. |
- Rensmo, Håkan, et al.
(författare)
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High light-to-energy conversion efficiencies for solar cells based on nanostructured ZnO electrodes
- 1997
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Ingår i: Journal of Physical Chemistry B. - : AMER CHEMICAL SOC. - 1520-6106 .- 1520-5207. ; 101:14, s. 2598-2601
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Photoelectrochemical properties of nanostructured ZnO thin film electrodes have been investigated in the UV and visible regions. For films consisting of 15 nm large undoped crystallites a maximum monochromatic current conversion efficiency of 58% was obtained in the visible using a ruthenium-based dye as a sensitizer. The overall solar energy conversion efficiency for this film was 2%. In comparison, sensitized films consisting of 150 nm large Al-doped crystallites yield a monochromatic current conversion efficiency of 31% and an overall solar energy conversion efficiency of 0.5%. The study also shows that nanostructured ZnO may give high efficiencies in the UV region, approaching unity for the Al-doped films.
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| 5. |
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| 6. |
- Rensmo, Håkan, et al.
(författare)
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The electronic structure of the cis-bis(4,4'-dicarboxy-2,2'-bipyridine)-bis(isothiocyanato) ruthenium(II) complex and its ligand 2,2'-bipyridyl-4,4'-dicarboxylic acid studied with electron spectroscopy
- 1997
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Ingår i: CHEMICAL PHYSICS LETTERS. - : ELSEVIER SCIENCE BV. - 0009-2614. ; 274:1-3, s. 51-57
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The electronic structure of the dye complex cis-bis(4,4'-dicarboxy-2,2'-bipyridine)-bis(isothiocyanato)ruthenium(II) as well as that of its ligand 2,2'-bipyridine-4,4'-dicarboxylic acid has been investigated with electron spectroscopy. Valence level spect
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| 7. |
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