Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Achievement of long-term stability is one of the most challenging issues that hinder organic solar cells from commercial applications. Understanding the degradation mechanism in organic solar cells is of great importance, so that the stability and lifetime could be improved. In this study, the photo-degradation mechanism of P3HT:PCBM bulk-heterojunction solar cells is investigated by using the AMPS-1D (Analysis of Microelectronic and photonic Structures) computer program. An effective medium model with exponential tail states, Gaussian mid-gap states and P-doped active layer is used to simulate the J-V characteristics of the photovoltaic devices. By using the proposed model the experimental J-V characteristics of both fresh and degraded devices could be nicely reproduced. For both fresh and degraded devices, the energy level diagrams at thermodynamic equilibrium and open circuit conditions, the electric field, the charges lifetime, the total recombination rate is calculated as a function of position in the active layer. The simulation results show that prolonged light illumination causes an increase in the density of the mid-gap states, an increase of the p-doping concentration, a slight increase in back contact barrier height, which finally result in lower charge carriers mobility, higher total recombination rate and insufficient charge collection.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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