Effects of oxygen in solid-state dye-sensitized solar cells
(English)Manuscript (preprint) (Other academic)
The effects of oxygen on a solid-state dye-sensitized solar cell (sDSC) based on the molecular hole transporting material 2,2’,7,7’,-tetrakis(N,N-di-p-methoxyphenyl-amine)-9,9’,-spirofluorene (spiro-OMeTAD) were studied in detail. Using electrical resistivity measurements in conjunction with time-of-flight and UV-VIS absorption techniques it was demonstrated that chemical oxidation of the hole transport material depends on storage conditions, including O2 pressure and time. This oxidation leads to doping and a lower total serial resistance in the device and improved solar cell characteristics. By using a small light modulation set-up together with a pressure controlled vacuum chamber, it was found that the solar cell electron recombination lifetime is dependent on the partial pressure of oxygen, reducing recombination with increasing pressures.
Research subject Physical Chemistry
IdentifiersURN: urn:nbn:se:uu:diva-166496OAI: oai:DiVA.org:uu-166496DiVA: diva2:476658