Fabrication And Physical Property Simulation Of Organic Polymer Solar Cell

Recently, in the search field of solar cells, there has been much more interest in the development of low cost material and high efficiency manufacture technique. Based on thin solid films, organic polymer solar cells have been receiving increasing attention due to their potential for large-area, flexible and low-cost. Although significant progress has been made in polymer solar cell research in recent years, the energy conversion efficiency is much lower than solar cells from inorganic semiconductors. And much higher efficiency and better stability of polymer solar cells are necessary if we want to introduce it into commercial application.The method that can improve the efficiency of organic solar cell can be from the choice of organic solar material and the optimization of the devices. Also modeling the influence of the activation layer thickness and the microstructure on the photocurrent and the efficiency of exciton separation, and the influence of serial resistance and parallel resistance on volt-ampere characteristic theoretically is another efficient method to improve the efficiency of polymer solar cell.First, according to the method previously described, we have synthesized N,N′-diphenyl glyoxaline-3,4,9,10-perylene tetracarboxylic acid diacidamide (PV) that exhibites relatively high electron affinity of the large-band-gap materials, large visible extinction coefficients, photostability and chemistry stability and poly(3-dodecylthiophene)(PDT)with highly soluble in toluene and chloroform. Then using polymer-dye composite, we fabricate the following photovoltaic devices ITO/PDT-PV/Al from which we can obtain the excellent photosensitivity and relatively high photovoltaic conversion efficiency with PV to provide significant enhancement in efficiency. Anneal can also improve the photovoltaic efficiency of the polymeric semiconductor devices.Based on the fabrication and testing of the photovoltaic devices, the structure and photocurrent property of organic polymer solar cell based on D-A heterojunction concept are simulated and designed. We use the optical principle and diffusion theory to calculate the profile of photoelectricity field and exciton concentration within the photovoltaic devices. The procedure of optical absorption and exciton diffusion which is the main limit of photovoltaic efficiency, as well as the influence of the separation degree of two composite and the life of exciton on the efficiency of exciton separation are simulated.At the same time we calculate and simulate the influence of limitation the volt-ampere property using the standard replacement circuit and analyse the performance potential of state of the art organic bulk heterojunction photovoltaic devices and give a guideline towards higher device efficiencies.