Metal selenide counter-electrode for dye-sensitized solar cell and preparation method of metal selenide counter-electrode

Abstract

The invention belongs to the technical field of solar cells, and particularly discloses a metal selenide counter-electrode for a dye-sensitized solar cell and a preparation method of the metal selenide counter-electrode. The preparation method includes preparing metal selenide by the aid of a one-step hydrothermal synthesis method; realizing in-situ growth of the metal selenide on a conducting substrate without any other aftertreatment; and directly applying the metal selenide to the dye-sensitized solar cell so that better energy conversion efficiency can be obtained as compared with a pyrolysis platinum counter-electrode. A process is simple, the prepared non-platinum counter-electrode not only is high in catalytic activity, but also is cheap in price, the cost of the counter-electrode is greatly reduced, furthermore, the comprehensive cost of the dye-sensitized solar cell is reduced, and the metal selenide counter-electrode and the preparation method can be applied to large-scale industrial production of dye-sensitized solar cells.

Description

technical field

[0001] The invention belongs to the technical field of solar cells, and in particular relates to a metal selenide counter electrode applied to a dye-sensitized solar cell and a preparation method thereof. Background technique

[0002] Since Professor M. Grötzel introduced the concept of nanoporosity into dye-sensitized wide bandgap TiO in 1991, 2 In semiconductor research, since dye-sensitized solar cells (DSSCs) with an energy conversion efficiency of 7.1% were obtained (Nature, 1991, 353, 737), DSSCs are characterized by their low cost, relatively simple manufacturing process, high The photoelectric conversion efficiency and other characteristics have quickly attracted widespread attention from the international academic and industrial circles.

[0003] DSSCs mainly consist of dye-sensitized porous semiconductor nanocrystal films, electrolytes, and counter electrodes. The dye molecules are excited by light, electrons are injected into the conduction band ...

Examples

Embodiment 1

[0015] Example 1, 0.1 mmol cobalt chloride hexahydrate (CoCl 2 ·6H 2 (0) and 0.15 mmol selenium powder (purity 99.999%) were added in a 50 mL hydrothermal kettle, then 7.5 mL of hydrazine hydrate solution (content 85wt%) was added, and finally 30 mL of deionized water was added to make the volume of the mixed solution reach about 3 / 4 capacity. After fully stirring evenly, put a piece of thoroughly cleaned FTO conductive glass into the hydrothermal kettle, seal the hydrothermal kettle tightly, and conduct a hydrothermal reaction at 120°C for 12 h. After the reaction, the hydrothermal kettle was naturally cooled to room temperature, and the conductive glass was taken out, rinsed and dried.

[0016] This counter electrode was assembled into DSSCs according to the standard method, with a cell area of ​​0.2304 cm 2 . The current-voltage (I-V) curve of the dye-sensitized solar cell was measured under AM1.5 simulated sunlight ( figure 2 shown in curve 1), to obtain the open cir...

Embodiment 2

[0017] Example 2, 0.2 mmol nickel chloride hexahydrate (NiCl 2 ·6H 2 (0) and 0.24 mmol selenium powder (purity 99.999%) were added in a 50 mL hydrothermal kettle, then 15 mL of hydrazine hydrate solution (content 85wt%) was added, and finally 22.5 mL of deionized water was added to make the volume of the mixed solution reach about 3 / 4 capacity. After fully stirring evenly, put a piece of thoroughly cleaned FTO conductive glass into the hydrothermal kettle, seal the hydrothermal kettle tightly, and conduct a hydrothermal reaction at 140°C for 10 h. After the reaction, the hydrothermal kettle was naturally cooled to room temperature, and the conductive glass was taken out, rinsed and dried.

[0018] This counter electrode was assembled into DSSCs according to the standard method, with a cell area of ​​0.2304 cm 2 . The I-V curve of the dye-sensitized solar cell was measured under AM1.5 simulated sunlight ( figure 2 shown in curve 2), we get V oc is 738 mV, J sc at 15.6...

Embodiment 3

[0019] Example 3, 0.2 mmol CoCl 2 ·6H 2 O and 0.4 mmol selenium powder (purity 99.999%) were added in a 50 mL hydrothermal kettle, then 20 mL of hydrazine hydrate solution (content 85wt%) was added, and finally 17.5 mL of deionized water was added to make the volume of the mixed solution reach about 3 / 4 capacity. After fully stirring evenly, put a piece of thoroughly cleaned FTO conductive glass into the hydrothermal kettle, seal the hydrothermal kettle tightly, and conduct a hydrothermal reaction at 100°C for 24 h. After the reaction, the hydrothermal kettle was naturally cooled to room temperature, and the conductive glass was taken out, rinsed and dried.

[0020] This counter electrode was assembled into DSSCs according to the standard method, with a cell area of ​​0.2304 cm 2 . The I-V curve of the dye-sensitized solar cell was measured under AM1.5 simulated sunlight, and obtained V oc is 722 mV, J sc at 14.74 mA / cm 2 , FF is 0.74, n is 7.88%.

technical field

[0001] The invention belongs to the technical field of solar cells, and in particular relates to a metal selenide counter electrode applied to a dye-sensitized solar cell and a preparation method thereof. Background technique

[0002] Since Professor M. Grötzel introduced the concept of nanoporosity into dye-sensitized wide bandgap TiO in 1991, 2 In semiconductor research, since dye-sensitized solar cells (DSSCs) with an energy conversion efficiency of 7.1% were obtained (Nature, 1991, 353, 737), DSSCs are characterized by their low cost, relatively simple manufacturing process, high The photoelectric conversion efficiency and other characteristics have quickly attracted widespread attention from the international academic and industrial circles.

[0003] DSSCs mainly consist of dye-sensitized porous semiconductor nanocrystal films, electrolytes, and counter electrodes. The dye molecules are excited by light, electrons are injected into the conduction band ...

Examples

Embodiment 1

[0015] Example 1, 0.1 mmol cobalt chloride hexahydrate (CoCl 2 ·6H 2 (0) and 0.15 mmol selenium powder (purity 99.999%) were added in a 50 mL hydrothermal kettle, then 7.5 mL of hydrazine hydrate solution (content 85wt%) was added, and finally 30 mL of deionized water was added to make the volume of the mixed solution reach about 3 / 4 capacity. After fully stirring evenly, put a piece of thoroughly cleaned FTO conductive glass into the hydrothermal kettle, seal the hydrothermal kettle tightly, and conduct a hydrothermal reaction at 120°C for 12 h. After the reaction, the hydrothermal kettle was naturally cooled to room temperature, and the conductive glass was taken out, rinsed and dried.

[0016] This counter electrode was assembled into DSSCs according to the standard method, with a cell area of ​​0.2304 cm 2 . The current-voltage (I-V) curve of the dye-sensitized solar cell was measured under AM1.5 simulated sunlight ( figure 2 shown in curve 1), to obtain the open cir...

Embodiment 2

[0017] Example 2, 0.2 mmol nickel chloride hexahydrate (NiCl 2 ·6H 2 (0) and 0.24 mmol selenium powder (purity 99.999%) were added in a 50 mL hydrothermal kettle, then 15 mL of hydrazine hydrate solution (content 85wt%) was added, and finally 22.5 mL of deionized water was added to make the volume of the mixed solution reach about 3 / 4 capacity. After fully stirring evenly, put a piece of thoroughly cleaned FTO conductive glass into the hydrothermal kettle, seal the hydrothermal kettle tightly, and conduct a hydrothermal reaction at 140°C for 10 h. After the reaction, the hydrothermal kettle was naturally cooled to room temperature, and the conductive glass was taken out, rinsed and dried.

[0018] This counter electrode was assembled into DSSCs according to the standard method, with a cell area of ​​0.2304 cm 2 . The I-V curve of the dye-sensitized solar cell was measured under AM1.5 simulated sunlight ( figure 2 shown in curve 2), we get V oc is 738 mV, J sc at 15.6...

Embodiment 3

[0019] Example 3, 0.2 mmol CoCl 2 ·6H 2 O and 0.4 mmol selenium powder (purity 99.999%) were added in a 50 mL hydrothermal kettle, then 20 mL of hydrazine hydrate solution (content 85wt%) was added, and finally 17.5 mL of deionized water was added to make the volume of the mixed solution reach about 3 / 4 capacity. After fully stirring evenly, put a piece of thoroughly cleaned FTO conductive glass into the hydrothermal kettle, seal the hydrothermal kettle tightly, and conduct a hydrothermal reaction at 100°C for 24 h. After the reaction, the hydrothermal kettle was naturally cooled to room temperature, and the conductive glass was taken out, rinsed and dried.

[0020] This counter electrode was assembled into DSSCs according to the standard method, with a cell area of ​​0.2304 cm 2 . The I-V curve of the dye-sensitized solar cell was measured under AM1.5 simulated sunlight, and obtained V oc is 722 mV, J sc at 14.74 mA / cm 2 , FF is 0.74, n is 7.88%.

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