[Ali* et al., 5(8): August, 2016] ISSN: 2277-9655 IC™ Value: 3.00 Impact Factor: 4.116 http: // www.ijesrt.com © International Journal of Engineering Sciences & Research Technology [119] IJESRT INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY THE RELATIONSHIP BETWEEN ATOMIC NUMBER & EFFICIENCY AT DYE SOLAR CELLS Sakina Ibrahim Ali*, Mubarak Dirar Abdallah, Sawsan Ahmed Elhouri Ahmed, Rawia Abdalgani, Amel Abdalla A, Abdalsakhi. S. M. H * Sudan University of Science & Technology-College of Science-Department of Physics-Khartoum- Sudan International University of Africa- College of Science-Department of Physics & Sudan University of Science &Technology-College of Science-Department of Physics- Khartoum-Sudan University of Bahri- College of Applied & Industrial Sciences-Department of Physics- Khartoum - Sudan Sudan University of Science & Technology-College of Science-Department of Physics-Khartoum-Sudan Sudan University of Science & Technology-College of Science-Department of Physics-Khartoum-Sudan Al Neenlen University – Faculty of Science and Technology Department of Physics ABSTRACT In this work the effect of changing the anode of polymer solar cell on their performance was experimentally investigated .The cells were fabricated from ITO which act as a cathode beside MEH PPV ,Ecrchrom Black T and Rohadamin B dyer . The anodes which c are AL, GL ,AU with atomic number 13 , 47 and 79 were used . It was found that the efficiency of the solar cell of AL, GL ,AU electrode for Ecrchrom dye are 1.66, 1.59 , and 1.58 Respectively the efficiency for Rohadamin , Ecrchrom Black T dye are 1.49, 1.48 and 1.46 respectively these results shows clearly that the efficiency increases as the atomic number decreases this conforms with the fact that energy gap increase with the atomic number. KEYWORDS: Ecrchrom Black T, Rohadamin B, thin film, solar cell, photovoltaic property, optical property. INTRODUCTION Human need energy so as to make life easier now a day petroleum fuels are the most wide spread energy which cause type[ 1] recently it was discovered that petroleum fuel cause air pollution which cause severe biological hazards' [2, 3] this forces scientists to search cheap free pollution energy forms [4,5] the most popular alternative that satisfies these needs is the solar energy [6] solar energy can be converted into many energy forms but the most preferable energy conversion is the electric energy conversion .[7] this is done by solar cells which converts solar radiation energy into electric energy [8,9]solar cells fabricated form silicone are the more commercially available solar cell types .Despite the fact that silicone solar cells are stable and live for a long time .but they suffer from some drawbacks first of all these cells are expensive and needs complex fabrication techniques. This encourages scientists to search for a new generation of cells.The direct conversion of light into electricity is done by solar cells. The usage of solar energy for heat has a long history but the origin of devices which produce electricity is much more recent. It is closely linked to modern solid-state electronics. Indeed, the first usable solar cell was invented at Bell Laboratories, the birthplace of the transistor - in the early 1950’s. The first solar cells found a ready application in supplying electrical power to satellites. Terrestrial systems soon followed, these were what we would now call remote industrial or professional applications, providing small amounts of power in inaccessible and remote locations, needing little or no maintenance or attention. Examples of such applications include signal or monitoring equipment, or telecommunication and corrosion protection systems. Since then, numerous photovoltaic systems have been installed to provide electricity to the large number of people on our planet that do not have (nor, in the foreseeable future, are likely to have) access to mains electricity. The most popular wide spreaded cell [10] .Its characterized by long life time , chemical stability