Homo and lumo organic chemistry series#

The contributions to the HOMO and LUMO energy levels were investigated when alternating the linker moiety. The following parts of this thesis regard this development strategy. Alternating the donor, linker or acceptor moieties independently, would give us the tool to tune the HOMO and LUMO energy levels of the chromophores. This chromophore consists of a triphenylamine moiety as an electron donor, a conjugated linker with a thiophene moiety and cyanoacrylic acid as an electron acceptor and anchoring group. The development of efficient organic chromophores for dye sensitized solar cells starts off with one new organic chromophore, D5. The chromophores are divided into three components donor, linker and acceptor. This thesis deals with development and synthesis of organic chromophores for dye sensitized solar cells. , D3, LindstedtsvГ¤gen 5, Stockholm, 13:00Дў009 (English) Doctoral thesis, comprehensive summary (Other academic) Abstract Trita-CHE-Report, ISSN 1654-1081 2007:86 KeywordsOrganic Chromophores, Dye Sensitized Solar Cells A top overall efficiency of 7.1 % was achieved. The fourth part describes the contributions from different donor groups to the HOMO and LUMO energy levels and has so far been the most successful in terms of reaching high efficiencies in the solar cell. The poor electronic coupling of the acceptor group to the semiconductor surface proved to be a problem for the overall efficiency of the solar cell, however. The HOMO and LUMO energy level tuning was once again successfully shifted. The third part describes the investigation of an alternative acceptor group, rhodanine-3-acetic acid, in combination with different linker lengths. Unexpected effects of the solar cell performances when increasing the linker length were revealed, however. By varying the linker the HOMO and LUMO energy levels was indeed shifted. The second part describes the contributions to the HOMO and LUMO energy levels when alternating the linker moiety. During this work a strategy to obtain an efficient sensitizer was developed. The chromophore consists of a triphenylamine moiety as an electron donor, a conjugated linker with a thiophene moiety and cyanoacrylic acid as an electron acceptor and anchoring group. The first part of the thesis describes the development of an efficient organic chromophore for dye sensitized solar cells. This thesis is divided into four parts with organic chromophores for dye sensitized solar cells as the common feature and an introduction with general concepts of the dye sensitized solar cells. High-efficiency, coumarin dyes, tio2, acid, performance, derivatives, design, light National CategoryД¬hemical Sciences Identifiers URN: urn:nbn:se:kth:diva-7882 DOI: 10.1021/jo701592x ISI: 000251313600017 PubMedID: 17979286 Scopus ID: 2-s2.0-36849079856 OAI: oai::kth-7882 DiVA, id: diva2:13041Дў007 (English) Licentiate thesis, comprehensive summary (Other scientific) Abstract Place, publisher, year, edition, pages2007. These results show that energetic tuning of the chromophores was successful and fulfilled the thermodynamic criteria for dye-sensitized solar cells, electrical losses depending on the size and orientation of the chromophores were observed. This is supported by spectral and electrochemical experiments and TDDFT calculations. HOMO and LUMO energy level tuning is achieved by varying the conjugation between the triphenylamine donor and the cyanoacetic acid acceptor.

Homo and lumo organic chemistry series#

9550-9556 Article in journal (Refereed) Published Abstract ДЄ series of organic chromophores have been synthesized in order to approach optimal energy level composition in the TiO2-dye-iodide/triiodide system in the dye-sensitized solar cells.

Show others and affiliations 2007 (English) In: Journal of Organic Chemistry, ISSN 0022-3263, E-ISSN 1520-6904, no 72, p.