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Laminated solar cells have better performance

Newstime:2017-09-06 10:13:47

For solar cells, the design is the same as a two blade razor, and that's the two step, better than a good one. The overlapping of the two solar cells is a good design, the upper layer is a translucent material that converts high-energy photons into electrical energy, while the underlying material converts low-energy photons. This allows more light energy to be converted into electrical energy.

To date, the complex technology required for the process is largely confined to space or dense photovoltaic (CPV) fields. The "stacked cells" are grown on very expensive single crystalline wafers and are therefore not conducive to mass production. The research team of EMPA Laboratory of materials science and technology Swiss Confederation films and photovoltaic laboratory Stephan Buecheler and Ayodhya N. Tiwari led the successful growth of laminated solar cell in polycrystalline thin films, this method has the advantages of low cost, so it is conducive to large-scale application, provides the possibility for large-scale manufacturing of high efficiency solar cell. This method is the secret: researchers at very low temperature (50 DEG C) created this top-level Perovskite Thin film solar cell, the production process of low energy consumption, low cost, very promising. The photoelectric conversion efficiency of the laminated solar cell is up to 20.5%. Empa

The researchers believe that the battery produced by this method is likely to further improve conversion efficiency.

Molecular soccer serves as the basis for this kind of magic crystal

The success of this double layer material benefits from the development of surface translucent solar cells, with efficiencies of 14.2% and penetration of 72%. The material is formed by depositing lead iodide with ammonium iodide in a perovskite crystal. The calcium titanium deposits are grown on the PCBM material layer. Each PCBM molecule contains 61 carbon atoms, and the atoms are interconnected like a soccer ball. Perovskite is through this layer of vapor deposition and spin coating method, so it has a football like structure, and then annealing in the temperature to be neither hot nor cold. ". The calcium titanium layer converts blue and yellow light into electrical energy. In contrast, the red and infrared sections pass through the crystal. So researchers can design a battery that converts this part of light into electricity.

Dual cell benefits: better use of solar energy

Empa researchers used CIGS (copper indium gallium selenide two) batteries as the bottom layer of such stacked batteries, a technology that the lab has been exploring for years. The advantage of this kind of laminated cell is that they can make full use of solar energy. Solar cells can only absorb photons with energy greater than the width of the band. If the photon energy is too low, it will not generate electricity. If the photon energy is higher, then a higher part of the energy will be converted to heat and wasted. The double layer cell can make full use of materials with different band widths so as to effectively convert solar energy into electric energy.

Photoelectric conversion efficiency of over 30% is not a dream

Although the efficiency of single layer polycrystalline solar cells can reach up to 25%, this kind of stacked cell can increase the efficiency to 30%, but there is still a lot of work to do. Ayodhya Tiwari says, "what we are doing now is just the beginning.". We need to overcome a lot of obstacles to reach our goal. In order to achieve this, we need multidisciplinary experiences to carry out many experiments, knowing that we found a translucent high-performance battery." ”Stephan Bücheler say that on the efficiency of solar cells is not only an academic competition show, "when the production of solar energy, only half of the cost will be reflected to the solar module itself, the other half is reflected in the aspect of infrastructure, such as inverter, cable, carrier cells, engineering cost and installation etc.. As solar cells become more efficient and smaller in size, the cost of these facilities is also reduced."

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