Semiconductor nanocrystalline sensitized solar cell and preparation method thereof

A technology of solar cells and nanocrystals, applied in photosensitive devices, circuits, capacitors, etc., can solve environmental hazards, toxicity and other problems, and achieve the effects of simple preparation process, excellent photovoltaic performance, and excellent photoelectric performance of batteries

Active Publication Date: 2013-04-03
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the semiconductor nanocrystals currently used are cadmium or lead compounds (such as cadmium sulfide, cadmium selenide, lead sulfide, lead selenide, etc.), due to the high toxicity of heavy metal cadmium or lead, it has a huge impact on the environment. hazards, so it is necessary to explore non-toxic semiconducting materials as sensitizers

Method used

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  • Semiconductor nanocrystalline sensitized solar cell and preparation method thereof
  • Semiconductor nanocrystalline sensitized solar cell and preparation method thereof
  • Semiconductor nanocrystalline sensitized solar cell and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0026] Prepare porous tin oxide film, take 5.1g SnO 2 , add an appropriate amount of ethanol and ultrasonically disperse evenly; mix 2.7 g ethyl cellulose and 12.2 g terpineol evenly, add the above SnO 2 / ethanol mixture and placed in a sonicator to disperse evenly. After the resulting mixture was placed in a rotary evaporator to remove ethanol, a uniform, viscous SnO 2 slurry. SnO 2 The slurry was placed in the screen, and after the ink was evenly covered, the film was brushed on the FTO conductive surface, and then it was left to stand for 6 minutes to make it flattened, and then placed in a 125 °C oven for heat treatment for 6 minutes. Using a field emission scanning electron microscope (LEO-1530, Germany) to observe the surface microscopic appearance of the photoanode, as figure 1 shown. The thickness of the film printed with one layer of paste is about 4 μm measured by XP-1 step tester. The FTO glass brushed with a porous film was placed in a muffle furnace and sint...

Embodiment 2

[0032] Prepare SnO with the method identical with embodiment 1 2 Slurry, screen printing 1 layer of slurry, after sintering and cooling, take out the glass and soak it in TiCl-containing 4 solution in a closed container, heated in an oven at 70 °C for 20 min, took out the glass after cooling, rinsed it with deionized water, put it in a muffle furnace and sintered it at 500 °C for 30 min, and the titanium oxide coating on the porous tin oxide film was completed. Coating treatment, the thickness of the titanium oxide layer is 1-2 nm. Utilize the method identical with embodiment 1 to prepare Ag 2 S nanocrystalline sensitized photoanode, the same electrolyte and counter electrode material as in Example 1, the short-circuit current density of the prepared battery is 5.2 mA / cm 2, the open circuit voltage is 448.8 mV, the fill factor is 0.372, and the photoelectric conversion efficiency is 0.87%.

Embodiment 3

[0033] Embodiment 3. prepare SnO with the method identical with embodiment 1 2 Slurry, screen printing 2 layers of slurry, using the same sintering process and titanium oxide coating treatment process as in Example 2, and measuring the thickness of the tin oxide film with an XP-1 step tester to be about 8 μm. Utilize the method identical with embodiment 1 to prepare Ag 2 S nanocrystalline sensitized photoanode, the same electrolyte and counter electrode material as in Example 1, the short-circuit current density of the prepared battery is 8.3 mA / cm 2 , the open circuit voltage is 405.2 mV, the fill factor is 0.363, and the photoelectric conversion efficiency is 1.22%.

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Abstract

The invention belongs to the technical field of green renewable energy and relates to a semiconductor nanocrystalline sensitized solar cell and a preparation method thereof. The semiconductor nanocrystalline sensitized solar cell is characterized in that a photoanode is sensitized with silver sulfide nanocrystalline. The photoanode sensitized with the silver sulfide nanocrystalline is non-toxic, the prepared silver sulfide nanocrystalline solar cell is green, nontoxic, environment-friendly, simple in preparation process and has excellent photovoltaic property. In addition, due to the fact that silver sulfide has appropriate energy gap, excellent cell photoelectric property is achieved.

Description

technical field [0001] The invention belongs to the technical field of green renewable energy, and in particular relates to a semiconductor nanocrystal sensitized solar cell and a preparation method thereof. Background technique [0002] Semiconductor nanocrystal sensitized solar cell is a new type of photovoltaic cell. It uses semiconductor nanocrystal as light-absorbing material. When the size of nanocrystal is smaller than its Bohr radius, it becomes quantum dot. Quantum dots are quasi-zero-dimensional nanomaterials (usually narrow-bandgap semiconductor materials), the movement of electrons in them is restricted in all directions, and have significant quantum confinement effects, which have the following advantages: (1 ) can change the bandgap width by adjusting the particle size of quantum dots, so as to realize the full-spectrum absorption of sunlight; (2) There are many types of inorganic semiconductors to choose from, the cost is low, and the process is simple; (3) Co...

Claims

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Application Information

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IPC IPC(8): H01G9/20H01G9/042
CPCY02E10/549Y02P70/50
Inventor 林红申何萍焦星剑
Owner TSINGHUA UNIV
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