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Flexible cadmium telluride solar cells with graphene intercalation layer
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A technology of solar cells and insertion layers, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of device performance degradation stability, unsatisfactory effect, and thickness affecting battery electrical connection.
Active Publication Date: 2017-03-08
SICHUAN UNIV
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Problems solved by technology
For the former, due to the high resistivity, its thickness greatly affects the electrical connection of the battery; for the latter, the high resistivity of MoOx and the rapid diffusion of Cu often cause the degradation of device performance and stability problems
There are also ZnTe or Au / Pd as the insertion layer, but the effect is not ideal, and the rectification effect can still be observed, which may be related to the subsequent high-temperature deposition or treatment process of the insertion layer
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Embodiment 1
[0021] I. First, deposit graphene (Gr) by CVD method, put Ni foil (M1) into the vacuum chamber, and evacuate to about 2×10 4 Pa, the substrate temperature is 900 0 C~1000 0 C, introduce argon gas mixed with 5% methane, the gas flow rate is 50 sccm, hydrogen gas is 500 sccm, the deposition time is about 50-120 s, and 2000 sccm argon gas and 500 sccm hydrogen gas are introduced during the cooling process.
[0022] II. Next, deposit about 1 nm of Bi(D) and about 50 nm of Te(B) by evaporation.
[0023] III~IV. Subsequently, as attached figure 2 As shown by the solid line in process III, cadmium telluride (A) is prepared by evaporation method with a thickness of about 5000 nm, and the substrate temperature is 350 0 C, followed by evaporation of 400 nm CdCl 2 , then annealed in air at 440 0 c.
[0024] V~VI. The deposition of cadmium sulfide (W) adopts the chemical water bath method, and the drugs used are all analytical reagents, prepared with secondary deionized water, and ...
Embodiment 2
[0027] I. Deposit graphene (Gr) by VD method, put Ni foil (M1) into the vacuum chamber, and evacuate to about 2×10 4 Pa, the substrate temperature is 900 0 C~1000 0 C, introduce argon gas mixed with 5% methane, the gas flow rate is 50 sccm, hydrogen gas is 500 sccm, the deposition time is about 50-120 s, and 2000 sccm argon gas and 500 sccm hydrogen gas are introduced during the cooling process.
[0028] II. Next, deposit about 1 nm of Sb (D) and about 50 nm of Te (B) by evaporation.
[0029] III~IV. Subsequently, as attached figure 2 As shown by the dotted line in process III, Cd(A) was prepared by near-space sublimation method with a thickness of about 6 000 nm and a deposition temperature of about 570 0 C, followed by evaporation of 400 nm CdCl 2 , then annealed in air at 440 0 c.
[0030] V~VI. Deposition of cadmium sulfide (W) The sputtering method deposits about 50 nm, in which the purity of the CdS target is 99.99%, and the background vacuum is ~10 -4 Pa, the w...
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Abstract
The invention discloses a flexible cadmiumtelluridesolar cell with a grapheneinsertion layer. With nickel foil as a substrate and graphene as the insertion layer, the nickel foil and the graphene are arranged on the substrate; and a doped layer and a barrier layer are fabricated behind the insertion layer to form a back contact layer of the flexible cadmiumtelluridesolar cell. Meanwhile, a ZnO-based transparent conductive composite thin film is adopted by a front contact layer; and a copper-free structural design and a copper-free technological treatment process are adopted by the solar cell, so that the photoelectric conversion efficiency of the flexible solar cell can be greatly improved; the long-term stability of a device is improved; and the structural design of the device and the selection of the back contact layer are well compatible to the technological process. In addition, due to the self-support characteristics of the graphene insertion layer, the graphene can be stripped from the metal substrate as an independent transparent cell, and can also be transplanted to a bottom cell to fabricate an efficient laminated cell.
Description
technical field [0001] The invention belongs to the field of new energy materials and devices. Background technique [0002] For more than ten years, many countries in the world are actively developing thin-film solar cells: amorphous silicon solar cells, copperindium (gallium) selenium solar cells, and cadmiumtelluride solar cells. Compared with crystalline silicon solar cells, it has potential advantages in production and other aspects. Usually the functional layer of thin-film solar cells is only a few microns thick, but glass substrates with a thickness of 1-4 mm are often used. In this way, about 98% of the weight of the entire battery is concentrated on the substrate. If other light-weight substrates are used instead of glass, devices with high specific power (the ratio of output power to device weight) can be obtained. [0003] In terms of space exploration, the most basic requirement for space power is high specific power, which is conducive to the low-cost launc...
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