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Solar cell

A technology for solar cells and anodes, applied in the field of solar cells, can solve problems such as the reduction of photoelectric conversion efficiency, and achieve the effects of high photoelectric conversion efficiency and difficult reduction of photoelectric conversion efficiency.

Pending Publication Date: 2021-08-13
SEKISUI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, a perovskite solar cell using a photoelectric conversion material having such a perovskite structure has high photoelectric conversion efficiency immediately after manufacture, but if a voltage is applied for a long time, the material of the anode may diffuse to include an organic-inorganic perovskite compound. in the photoelectric conversion layer, thereby reducing the photoelectric conversion efficiency

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0080] An ITO film with a thickness of 300 nm was formed as a cathode on a glass substrate, and after ultrasonic cleaning was performed for 10 minutes each using pure water, acetone, and methanol in this order, it was dried.

[0081] On the surface of the ITO film, a thin-film electron transport layer containing titanium oxide was formed to a thickness of 20 nm by sputtering. Furthermore, a titanium oxide paste containing titanium oxide (a mixture of average particle diameters of 10 nm and 30 nm) was applied by spin coating on the thin film electron transport layer to form a porous electron transport layer with a thickness of 100 nm.

[0082] Next, 550 mg of lead iodide as a metal halide was added and dissolved in a mixed solvent of 1 ml of N,N-dimethylformamide (DMF) and 80 μl of dimethyl sulfoxide to prepare a solution. This was formed into a film by a spin coating method on the above-mentioned porous electron transport layer to form a first film. In addition, methylammoniu...

Embodiment 2～48、 comparative example 6～22

[0088] As shown in Tables 1 to 3, the type and thickness of the anti-diffusion layer and the anode were changed, except that, it was performed in the same manner as in Example 1, and a cathode / electron transport layer / photoelectric conversion layer / hole transport layer / anti-diffusion layer were sequentially stacked. Diffusion layer / anode for solar cells.

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Abstract

The purpose of the present invention is to provide a solar cell which has high photoelectric conversion efficiency, and which is not susceptible to a decrease in the photoelectric conversion efficiency even if a voltage is applied thereto for a long period of time. The present invention is a solar cell which sequentially comprises a negative electrode, a photoelectric conversion layer, a diffusion prevention layer and a positive electrode in this order, and which is characterized in that: the negative electrode is a transparent electrode; the positive electrode contains at least one element that is selected from the group consisting of aluminum, copper, antimony and molybdenum; and the photoelectric conversion layer contains an organic-inorganic perovskite compound that is represented by general formula AMX (wherein A represents an organic base compound and / or an alkali metal; M represents a lead or tin atom; and X represents a halogen atom). This solar cell is also characterized in that: the diffusion prevention layer is composed of molybdenum, tungsten, tantalum, niobium, zirconium, hafnium or an alloy of these metals, while having a thickness of 5-30 nm (inclusive); the diffusion prevention layer is composed of an oxide that contains titanium, gallium, zinc, tin, indium, antimony, molybdenum, tungsten, vanadium, chromium, nickel or lead; the diffusion prevention layer is composed of a nitride that contains titanium, vanadium, chromium, niobium, tantalum, molybdenum, zirconium or hafnium, while having a thickness of 5-50 nm; or the diffusion prevention layer is composed of graphite, while having thickness of 2-50 nm.

Description

technical field [0001] The present invention relates to a solar cell whose photoelectric conversion efficiency is high and whose photoelectric conversion efficiency is not easily lowered even if a voltage is applied for a long period of time. Background technique [0002] Conventionally, a solar cell including a laminate (photoelectric conversion layer) in which an N-type semiconductor layer and a P-type semiconductor layer are arranged between opposing electrodes has been developed. In such a solar cell, photocarriers (electron-hole pairs) are generated by photoexcitation, electrons move in an N-type semiconductor, and holes move in a P-type semiconductor, thereby generating an electric field. [0003] At present, most practical solar cells are inorganic solar cells manufactured using inorganic semiconductors such as silicon. However, inorganic solar cells are not only expensive to manufacture, but also difficult to increase in size, and the range of application is limited...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/44
CPCY02E10/549H10K30/81H10K85/50H10K30/85H10K30/82H10K30/87H10K30/451
Inventor 早川明伸奥村拓郎福田武司
Owner SEKISUI CHEM CO LTD