Efficiency charge collection

Short-Circuit Current. Key parameters for efficient charge collection by plastic solar cells are the hole and electron mobilities of the interpenetrating networks and the lifetime of the carriers within this network. While the lifetime of the carriers in the bulk heterojunction blends has already been discussed as a peculiarity of the interpenetrating network, the mobility of the individual components is a true material parameter. The interplay between network quality and mobility and their impact on the short-circuit current will be discussed by means of a simple model in this section. 

To summarise these few experimental results, it can be stated that electronic transport in many nanostructured polycrystalline materials appears to be rather poor, particularly when the transport path involves grain boundaries. Yet in many cases the transport conditions can be improved by operating these films under majority-carrier transport conditions and exploiting trap filling under high-injection conditions. Efficient charge collection can then often be achieved. In absorber layers, where both carrier types are necessarily present, these conditions cannot usually be implemented. 

Ravirajan P., Bradley D. D. C., Nelson J., Haque S. A., Durrant J. R., Smit H. J. P. and Kroon J. M. (2005b), Efficient charge collection in hybrid polymer/TiOa solar cells using poly(ethylenedioxythiophene) polystyrene sulphonate as hole collector , App/. Phys. Lett. 86, 143101-1-143101-4. 

Efficient charge collection in hybrid polymer/Ti02 solar cells using poly(ethylenedioxythiophene)/polystyrene sulphonate as hole collector. Appl Phys Lett 86 143101... 

K. Takanezawa, et al. Efficient charge collection with ZnO nanorod array in hybrid photovoltaic devices. The Journal of Physical Chemistry C, 2007. 111(19) p. 7218-7223. 

While maximizing the charge diffusion length should enable much thicker devices to be fabricated, which still exhibit extremely efficient charge collection efficiency, there is another basic issue with the solid-state DSSC which may well prove to impose the most significant... 

Martinson ABF, Goes M r S, Fabregat-Santiago F, Bisquert J, Pellin MJ, Hupp JT (2009) Electron transport in dye-sensitized solar cells based on ZnO nanotubes evidence for highly efficient charge collection and exceptionally rapid dynamicsj". J Phys Chem A 113 4015 21... 

The spectrum for 7 tr < Riec is shown in Fig. 16b, c. It corresponds to a long diffusion length Ln>L and indicates efficient charge collection in a DSC at moderate forward bias [16]. The opposite case, for strong recombination, requires Rti > Rice, and is shown in Fig. 16e. The intermediate spectrum for Rti Rice is... 

Physical form Thin disk of Si typically 10-30 mm diameter with depletion layer formed beneath an insulating barrier on the surface Single crystal Si disk typically 10 mm diameter, 4 mm thick. Li diffused into Si to compensate delects and impurities to ensure efficient charge collection High purity single crystal Ge cylinder typically 20 mm diameter, 80 mm long... 

Ravirajan P, Bradley DDC, Nelson J, Hague SA, Dunant JR, Smit HJP, Kroon JM (2005) Efficient charge collection in hybrid polymer/Ti02 solar cells using poly(ethylenedioxythiophene)/polystytene sulphonate as hole coUecton Appl Phys Lett 86 143101. doi 10.1063/1.1890468... 

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