As part of the inventory of the diatomic flora of Séné-Gambia and the reconstruction of the history of Senegal’s estuaries, a sampling mission was carried out along the Saloum estuary in the upstream parts of its three branches which are the northern branch (the main inlet), the middle branch (the Diomboss) and the southern branch (the Bandiala). The samples were taken using a Russian auger. The bottom of the mud has always been reached, but at very variable depths. A total of six cores were made and the study of diatoms carried out. A total of 150 species of diatoms belonging to 70 genera have been inventoried. The most represented genera are Nitzschia (14 species) and Coscinodiscus (8 species). The microflora is dominated everywhere by Cyclotella striata except at Néma Ba where it admits Nitzschia granulata as co-dominant. Euryhaline species dominate everywhere and confirm the dual marine/freshwater influence, the degree of which has varied over time and space. These results, combined with the lithological data, allow the following conclusions to be drawn: (i) the filling deposit of the Saloum estuary, begun in Nouakchottian, is marked by an abundance of sands and a poverty or absence of diatoms; (ii) at the end of the Nouakchottian transgression, the development of the mangrove allows the deposit, in the upstream part of the main inlet, of peat incompatible with the conservation of diatom valves; elsewhere, the sands diminish in favor of lutites and allow the development of diatoms; (iii) between 3500 and 2500 years B.P., primary paleo-productivity and specific diversity increase everywhere and the Bandiala receives fresh water from the Nema River; (iv) after 2000 years BP, the growing influence of the Nema River leads to an increase in oligohalobic forms along the Bandiala; (v) at the top of the sedimentary series, the agitation of the environment caused the deposit of coarse sediments and the absence of diatoms.

New expressions of back surface recombination of excess minority carriers in the base of silicon solar are expressed dependent of both, the thickness and the diffusion coefficient which is in relationship with the doping rate.