Photovoltaic response

Photovoltaic response parameters for electrodeposited (polycrystalline) CdTe thin film electrodes in sulfide-polysulfide or alkaline sodium telluride PEC have been reported, primarily with no reference to the stability of the cells [100], In view of the instability of CdTe in aqueous solutions, Bhattacharya and Rajeshwar [101] employed two methods for the characterization of their electrodeposited CdTe-based PEC. In the first one, a coating of Pb02 (-100 nm thick) was deposited on the CdTe film surface by electroless deposition, and the coated films... 

Fig. 8. Photovoltaic response of heterojunction shown in in set and absorption edge of a-Si H. [After Fuhs et al. (1974).]...

R.N. Marks, J.J.M. Halls, D.D.C. Bradley, R.H. Friend, A.B. Holmes, The photovoltaic response in poly(p-phenylene vinylene) thin-film devices,./. Phys. Con-dens. Matter 6 (1994) 1379-1394. 

The detailed analysis of the transient photovoltaic responses affords one of the most direct methods of evaluating the individual exchange currents, 1 and ijj, for any reaction. Details will be given in papers presently in preparation. 

A silicon electrode with a small amount of deposited noble metals such as Pt does not behave as a buried junction and the photoelectrode properties are still determined by contact of the electrolyte, not the metal. The photovoltaic response of the Pt-deposited silicon electrode is due to the incomplete coverage of the surface by Pt so that the interface energetics remains dominated by the contact of the semiconductor surface with the electrolyte. The mechanism of the hydrogen reduction processes involves first photoexcitation of electron-hole pairs followed by charging of the small Pt islands with excited electrons. The charged Pt islands react with H2O at a high rate. 

Xu Z, Wu Y, Hu B, Ivanov IN, Geohegan DB (2005) Carbon nanotube effects on electroluminescence and photovoltaic response in conjugated polymers. Appl Phys Lett 87 263118... 

An additional verification of this interpretation has come from the observed threshold value 1.48 eV for a photovoltaic response of the trans-(CH)jt slightly doped with AsF5 (Tani et al., 1980). 

To enhance the photovoltaic response, the pH values (i) of the Chi a and Chi a-free half cells were maintained at 3 and 11, respectively, in another experiment. After the half cells were degassed by the passage... 

Figure 2. Effect of oxygen in the photovoltaic response of the platinized Chi a electrode, (a) Electrolyte purged with argon gas, measurements made under a positive pressure of Ar (b) O, electrolyte saturated with oxygen (c) , oxygen removed by passage of argon gas through the electrolyte solution for 30 min. The ordinate units are given in 10 electrons per incident photon. The efficiency of the liquid junction cell was calculated by dividing the photovoltaic response (electrons sec ) by the incident photoresponse (photons sec ).

The plasma polymerization of TCl JQ and TCNE was carried out at 13.56 MHz from the gas phase and semiconductive polymeric films were obtained [88, 89]. The electrical conductivities of the films obtained ranged fix m 10 " to 10 S cm and the Al/polymer/ITO (indium tin oxide) sandwich cells made from the films showed rectifying behavior and photovoltaic response. Photoconductivity was also observed in the films. Infrared, ultraviolet, and X-ray photoelectron spectroscopy were utilized to characterize the structure, and these results as well as those from electrical measurements confirmed that a conjugated structure with delocalized 7c-electrons has been formed in the films. 

P.A. van Hal, et al, Photoinduced electron transfer and photovoltaic response of a MDMO-PPV Ti02 bulk-heterojunction. Advanced Materials, 2003. 15(2) p. 118. 

The effects of solution processing on the photovoltaic response of PVK films have been investigated [60,61]. The films were formed by spincasting onto glass coated with ITO and poly(3,4-ethylenedioxythiophene)/poly(styrene sulfonate). The latter polymers are depicted in Figure 1.10. 

The exciton photodissociation, charge transport, and the photovoltaic response of PVK/Ti02 nanocomposites for solar-cell applications have been assessed [210]. 

Chung PS, Holloway PH. Effects of solution processing on the photovoltaic response of poly(A-vinyl carbazole) films. J Appl Polym Sci2010 117(l) 479-85. 

Dridi C, Barlier V, Chaabane H, Davenas J, Ben Ouada H. Investigation of exciton photodissociation, charge transport and photovoltaic response of poly(A-vinyl carbazole) f/02 nanocomposites for solar cell applications. Nanotechnology 2008 19(37) 375201. 

Korgel and co-workers have compared the photovoltaic response of absorber layer based on CuInSe2 nanociystals capped with organic ligand (oleylamine) and Inorganic ligands like metal chalcogenide-hydrazinium complexes (MCCs), S , HS and Thin film solar cells were... 

They reported that these copolymers showed broad absorption curves with long-wavelength absorption maximum around 620 nm and optical band of 1.68 and 1.64 eV for both polymers. Both polymers were studied for photovoltaic response in bulk heterojunction solar cells. They observed an overall power conversion efficiency of 3.15 and 2.60% for the cast polymers. Further improvement led up to 4.06 and 3.35% for the devices based on thermally annealed materials. 

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