Organic Photovoltaic Cells (Polymers) With global demand for electricity constantly increasing, the only way to address the problem is to harness energy from renewable sources. An exciting new technology that may be useful in addressing this problem is organic photovoltaic cells. Organic solar cells can be colored, flexible and transparent. What is interesting to note is that they can generate electricity even under cloudy skies. With the development of these cells, sooner or later we will be able to harness solar energy everywhere, in cars, on buildings and even on windows.1) Preparation methodsThe two most common production methods are vacuum evaporation and of developing the solution. Because polymers decompose under immense heat and their molar mass is too large for evaporation, most polymer-based photovoltaic elements are low-temperature processed solutions. Printing methods are used to deposit conjugated semiconducting polymers. Examples of such methods used for the production of polymer solar cells are doctoring, screen printing, spin coating and inkjet printing. Donor-acceptor mixtures are produced by dissolving the donor and acceptor modules in a mixture of solvents. Mixtures are deposited using one of the methods (spin coating, doctoring, screen printing or inkjet printing). Occasionally, a soluble monomer is cast as a thin film subsequently using a postdeposition polymerization reaction. Soluble precursor polymers can also be converted into the final product with a post-deposition conversion reaction. The advantage here is that the resulting conjugated polymer films are insoluble. Figure 1 – Schematic structure of the bulk polymer solar cell device. The active layer is sandwiched between two contacts (an idiotin oxide... in the center of the paper... accessed March 28, 2014B) Organic solar cells based on conjugated polymersLink-http://pubs .acs.org /doi/pdf/10.1021/cr050149zAccessed date – 27 March 2014C) Seventh framework program – “ Briefing n. 12 – Energy Organic Photovaltaics March 2011”Link-http://www.nanopinion.eu/sites/default/files/observatorynano_briefing_no.12_organic_photovoltaics.pdfAccess date: 28 March 2014D) The Bridge – “Organic semiconductors for low-cost solar cells by Chiatzun Goh and Michael D. McGehee” Link –https://www.nae.edu/Publications/Bridge/Cutting-EdgeResearchinEngineering/OrganicSemiconductorsforLow-CostSolarCells.aspxDate accessed – 26 March 2014E) CSIRO – “CSIRO Corporate Website” Link - http://www.csiro.au/Organisation-Structure/Flagships/Future-Manufacturing-Flagship/Flexible-Electronics/Organic-photovoltaics.aspxDate accessed: 28 March 2014