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High-efficiency cadmium selenide-cadmium telluride alloy nanocrystalline solar cell and preparation method thereof

A technology of solar cells and nanocrystals, which is applied in the manufacture of circuits, electrical components, and final products, can solve the problems of low efficiency, low open-circuit voltage, and short-circuit current, and achieve the effects of simple preparation process, prevention of oxidation, and saving of raw materials

Active Publication Date: 2018-04-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its efficiency is lower than 4%, mainly due to the existence of the interface state of the active layer, resulting in low open circuit voltage and short circuit current

Method used

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  • High-efficiency cadmium selenide-cadmium telluride alloy nanocrystalline solar cell and preparation method thereof
  • High-efficiency cadmium selenide-cadmium telluride alloy nanocrystalline solar cell and preparation method thereof
  • High-efficiency cadmium selenide-cadmium telluride alloy nanocrystalline solar cell and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: A high-efficiency cadmium selenium telluride alloy nanocrystalline solar cell and its preparation method

[0034] (1) Cleaning of ITO conductive glass substrate: (the specification is 15mm×15mm, the thickness of ITO is 130nm, and its square resistance is 20 ohms / square, purchased from Zhuhai Kaiwei Electronic Components Co., Ltd.) Ultrasonic treatment in toluene, acetone, semiconductor special detergent, deionized water, and isopropanol for 10 minutes to clean the surface of the ITO substrate, and then put the ITO sheet in a constant temperature oven at 80°C for 2 hours to dry.

[0035] (2) Preparation of ZnO layer:

[0036] ① Prepare ZnO sol: put zinc acetate dihydrate (3.2925g), ethanolamine (0.905mL), and ethylene glycol methyl ether (30m1) into a three-neck bottle and seal it. Keep heating in an oil bath at 80°C for 2 hours. (All of the above are analytically pure drugs, purchased from Guangzhou Qianhui Chemical Glass Co., Ltd.), filtered with a 0.45 μm...

Embodiment 2

[0047] Embodiment 2: Performance measurement of alloy nanocrystalline solar cell

[0048] The determination of the performance parameters of solar cell devices should take sunlight as the test standard. The standard irradiance measured by AM 1.5G in the laboratory is 1000W / m 2 . When using solar simulated light to test the performance of nanocrystalline solar cells, first use standard cells to judge whether the light source meets the irradiance of AM1.5G. Standard silicon solar cells are calibrated, under AM 1.5G standard spectrum, that is, 1000W / m 2 Under the light irradiation of the irradiance, the obtained short-circuit current is 125mA. Once the irradiation intensity is determined, the device can be tested. The solar cell performance test is carried out with the sun simulated light, and the energy conversion efficiency of the solar cell is:

[0049]

[0050] Among them, Pmax is the maximum output power (unit: mW), and Pin is the irradiance (unit: mW / cm 2 ), S is t...

Embodiment 3

[0053] Example 3: Effects of Different TOP-Se Contents in Precursors on the Performance of Nanocrystalline Solar Cells

[0054] The precursors with TOP-Se contents of 0, 10%, 20%, 30%, 40%, 50%, and 60% were selected to prepare CdSe x Te 1-x layer as the photoactive layer, and the device structure is ITO / ZnO / CdSe / CdSe x Te 1-x / MoO x / Au. where CdSe x Te 1-x 400nm thick, CdCl 2 The heat treatment temperature was 350° C., and the time was 15 minutes. Other parameters were implemented as in Example 1. The obtained results are shown in Table 2.

[0055] Table 2

[0056]

[0057]

[0058] It can be seen from Table 2 that when the TOP-Se content is 0, the battery efficiency is 3.07%; when the TOP-Se content is 20%, the battery efficiency is 3.64%, which is better than ITO / ZnO / CdSe / CdTe / MoO x / Au conventional heterojunction solar cells, indicating that the introduction of the alloy layer is beneficial to improve device performance.

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Abstract

The invention discloses a high-efficiency cadmium selenide-cadmium telluride alloy nanocrystalline solar cell and a preparation method thereof. The solar cell is formed by lamination of a glass substrate, a cathode, a cathode interface layer, a window layer, a photoactive layer, a back electrode modification layer, and an anode layer. The cathode is ITO, the cathode interface layer is ZnO, the window layer is CdSe or CdSexTe1-x alloy film, the photoactive layer is formed by lamination of multiple CdSexTe1-x layers and CdTe films, the back electrode modification layer is MoOx, and the anode isAu. The photoactive layer employs CdSexTe1-x alloy nanocrystalline and CdTe nanocrystalline to form a stepped structure. Compared with the traditional hetero-junction solar cell, the solar cell disclosed by the invention has the following advantages: separation, transmission, and collection of photon-generated carriers can be carried out conveniently; the performance of the device is improved obviously; processing is realized by an all-solution method, so that the cost is low and manufacturing becomes simple and convenient; and large-scale production can be realized well.

Description

technical field [0001] The invention belongs to the field of photoelectric devices, and in particular relates to a high-efficiency cadmium selenium telluride alloy nanocrystalline solar cell and a preparation method thereof. Background technique [0002] Energy and the environment are two major problems facing mankind today. With the increase in global energy consumption and unscientific use, non-renewable energy sources such as fossil fuels are increasingly depleted and have a serious impact on the environment. Developing clean energy and improving the structure of energy use has become an urgent task. Solar photovoltaic power generation is an important part of new energy and is considered to be the most promising new energy technology in the world. Solar cells based on the photovoltaic effect have always been a hot spot of scientific research at home and abroad. Compared with traditional crystalline silicon solar cells, nanocrystalline solar cells have become the new fav...

Claims

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Application Information

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IPC IPC(8): H01L31/032H01L31/18
CPCH01L31/0324H01L31/1832Y02P70/50
Inventor 覃东欢李妙姿温诗雅刘笑霖梅相霖吴镔
Owner SOUTH CHINA UNIV OF TECH
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