TAILIEUCHUNG - Solar Cells New Aspects and Solutions Part 3

Tham khảo tài liệu 'solar cells new aspects and solutions part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Flexible Photovoltaic Textiles for Smart Applications 61 8. Some facts about the photovoltaic textiles To achieve a highly efficient photovoltaic device solar radiation needs to be efficiently absorbed. In case of solar cell the absorption of light causes electron hole pairs which are split into free carriers at the interface between the donor and the acceptor material. Active areas for photovoltaic fibres are generally found between 4 and 10mm2. The power conversion efficiency of the MDMO-PPV PCBM based photovoltaic fibre was higher than the P3HT PCBM based photovoltaic fibres Due to circular cross-sectional shape of photovoltaic fibres the light is absorbed at different angles Generally the photoactive layer thickness remain approximately between 280-350nm. A thick film can absorb more light compared to a thin film. By the increase of film thickness the electrical field and the number of charge carriers decrease and consequently a decrease in the external quantum efficiency of the devices is observed. Although the film thickness is restricted in presence of low-charge carrier. The optimum thickness is required to provide both maximum light absorption and maximum charge collection at the same fraction of moment. Optimization of thickness of various layers of photovoltaic fibres provides the possibility to increase the power conversion efficiency of polymer-based solar cells. The thickness of the layers for optimal photovoltaic fibre can be controlled by solution concentration and dipping time. Photovoltaic fibre based organic solar cells can be curled and crimped without losing any photovoltaic performance from their structure. Low power conversion efficiency of photovoltaic textiles is the real challenge in this field and can be improved by significant improvement in existing photovoltaic material and techniques. In case of organic solar cells the optical band gap is very critical and it must be as narrow as possible because the polymers with narrow band gap are

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