1/f noise and dye-sensitized solar cells
Jayaweera, P V V; Pitigala, P K D D P; Perera, A G U; Tennakone, K; Jayaweera, P V V; Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30303, USA; Institute of Fundamental Studies, Hantana Rd, Kandy, Sri Lanka; Pitigala, P K D D P; Institute of Fundamental Studies, Hantana Rd, Kandy, Sri Lanka; Perera, A G U; Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30303, USA; Institute of Fundamental Studies, Hantana Rd, Kandy, Sri Lanka; Tennakone, K; Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30303, USA; Institute of Fundamental Studies, Hantana Rd, Kandy, Sri Lanka
Журнал:
Semiconductor Science and Technology
Дата:
2005-08-01
Аннотация:
The adsorbed molecular species, such as H<sub>2</sub>O and I<sub>2</sub>, that produce electron acceptor states on the TiO<sub>2</sub> surface are found to generate 1/f noise in the electric current through nanocrystalline films of TiO<sub>2</sub>. It is suggested that the trapping and detrapping of electrons at the surface states is the cause of this noise. When the TiO<sub>2</sub> film surface is coated with dyes, the passivation of the active surface sites suppresses 1/f noise. Implications of 1/f noise on the functioning of the dye-sensitized solar cell, notably the effect of adsorbed iodine in inducing recombinations, are discussed.
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