P V V Jayaweera et al 2005 Semicond. Sci. Technol. 20 L40 doi:10.1088/0268-1242/20/8/L04
P V V Jayaweera1,2, P K D D P Pitigala2, A G U Perera1,2 and K Tennakone1,2
Show affiliationsThe adsorbed molecular species, such as H2O and I2, that produce electron acceptor states on the TiO2 surface are found to generate 1/f noise in the electric current through nanocrystalline films of TiO2. It is suggested that the trapping and detrapping of electrons at the surface states is the cause of this noise. When the TiO2 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.
72.70.+m Noise processes and phenomena
73.20.At Surface states, band structure, electron density of states
73.20.Hb Impurity and defect levels; energy states of adsorbed species
Issue 8 (August 2005)
Received 18 May 2005, in final form 28 June 2005
Published 18 July 2005
P V V Jayaweera et al 2005 Semicond. Sci. Technol. 20 L40
F P Bowden and D Tabor 1966 Br. J. Appl. Phys. 17 1521
G Contopoulos et al 1999 J. Phys. A: Math. Gen. 32 5213
A B Walker et al 2002 J. Phys.: Condens. Matter 14 9825
I P Lokhtin and A M Snigirev 2007 J. Phys. G: Nucl. Part. Phys. 34 S999
Alka B Garg et al 2002 J. Phys.: Condens. Matter 14 8795
Ioannis Ioannou et al 2003 J. Phys. D: Appl. Phys. 36 3176
Jens Eberhard 2004 J. Phys. A: Math. Gen. 37 9587
Norman Dombey and Fuad M Saradzhev 2000 J. Phys. A: Math. Gen. 33 4491
Giovanni Montani et al 2003 Class. Quantum Grav. 20 4195