Thin-film solar cell composite back electrode utilizing polymers as substrate and preparation method
A technology for solar cells and back electrodes, which is used in circuits, electrical components, and final product manufacturing, etc., can solve the problems of large surface roughness, high resistivity, and can not meet the requirements of metal back electrodes for thin-film solar cells, and achieves sputtering. The effect of shorter time, lower surface resistance, material usage and energy saving
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[0021] The structural features and process of the present invention will be described in detail with a specific embodiment below in conjunction with the accompanying drawings.
[0022] In this embodiment, a 100nm thick high-resistance residual tensile stress metal Mo film 2, a 500nm thick low resistance residual compressive stress metal Mo film 3, a 25nm thick low-resistance compressive stress metal Mo film 3, and a 25nm thick low-residual compressive stress metal Mo film are sequentially sputtered on a flexible polymer substrate 1 by magnetron sputtering. High-resistance reflective residual compressive stress metal Mo thin film 4.
[0023] The specifications of the magnetron sputtering target used: the target is a circular metal Mo target with a diameter of 3 inches, the purity is greater than 99.95%, and the distance between the surface of the sputtering target and the surface of the substrate is 100mm. The background vacuum of the sputtering vacuum chamber is about 10 -5 P...
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