A perovskite solar cell doped with potassium thiocyanate and a preparation method thereof

A technology of solar cells and potassium thiocyanate, applied in circuits, photovoltaic power generation, electrical components, etc., can solve problems such as many defects, large hysteresis effect of batteries, and poor crystal quality

Inactive Publication Date: 2019-01-18
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because organometallic halide perovskite materials are sensitive to the preparation environment, there are problems of poor crystal quality, many defects, and phase instability, which affects the highlighting of the advantages of perovskite materials and limits the efficiency and stability of perovskite batteries. Therefore, the key to preparing high-efficiency and stable perovskite batteries is to prepare high-quality perovskite films and suppress the hysteresis effect.

Method used

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  • A perovskite solar cell doped with potassium thiocyanate and a preparation method thereof
  • A perovskite solar cell doped with potassium thiocyanate and a preparation method thereof
  • A perovskite solar cell doped with potassium thiocyanate and a preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Step 1. Clean FTO conductive glass: choose FTO conductive glass with a square resistance of 14Ω, a light transmittance of 90%, and a thickness of 2.2mm as the base material, and use detergent solution, deionized water, ethanol, acetone, and isopropyl in sequence Alcohol was cleaned in an ultrasonic machine for 30 minutes, and then treated with an ultraviolet ozone cleaner for 15 minutes to obtain FTO conductive glass with a clean surface.

[0043] Step 2. Preparation of TiO 2 Precursor liquid and preparation of TiO 2 Dense layer: Dilute 369 microliters of isopropyl titanate solution into 2.53 milliliters of isopropanol, then dilute 35 microliters of hydrochloric acid solution (2M concentration) into 2.53 milliliters of isopropanol, and finally dilute the two The two solutions were mixed and stirred for a long time to obtain TiO 2 Precursor fluid; the prepared TiO 2 The precursor liquid was spin-coated on the FTO under the parameter of "3000 rpm for 30 seconds", and h...

Embodiment 2

[0052] Step 1, cleaning the FTO conductive glass: same as Step 1 in Example 1.

[0053] Step 2. Preparation of TiO 2 Precursor liquid and preparation of TiO 2 Dense layer: same as Step 2 in Example 1.

[0054] Step 3. Preparation of TiO 2 Mesoporous layer: same as Step 3 in Example 1.

[0055] Step 4, preparing potassium thiocyanate solution: same as step 4 in Example 1.

[0056] Step five, preparation of potassium thiocyanate-doped perovskite precursor fluid: lead iodide (PbI 2 ), methylamine iodide (MAI) and dimethyl sulfoxide (DMSO) were dissolved in dimethylformamide (DMF) solution at a molar ratio of 1:1:1, so that their concentration was 1.4mol / ml, and then The solution was stirred at 40 °C for 1 hour to obtain a clear and transparent yellow perovskite precursor liquid. 14 microliters of the prepared potassium thiocyanate solution was added to 1 ml of the perovskite precursor solution to obtain a 1% (molar ratio) potassium thiocyanate-doped perovskite precursor sol...

Embodiment 3

[0062] Step 1, cleaning the FTO conductive glass: same as Step 1 in Example 1.

[0063] Step 2. Preparation of TiO 2 Precursor liquid and preparation of TiO 2 Dense layer: same as Step 2 in Example 1.

[0064] Step 3. Preparation of TiO 2 Mesoporous layer: same as Step 3 in Example 1.

[0065] Step 4, preparing potassium thiocyanate solution: same as step 4 in Example 1.

[0066] Step five, preparation of potassium thiocyanate-doped perovskite precursor fluid: lead iodide (PbI 2 ), methylamine iodide (MAI) and dimethyl sulfoxide (DMSO) were dissolved in dimethylformamide (DMF) solution at a molar ratio of 1:1:1, so that their concentration was 1.4mol / ml, and then The solution was stirred at 40 °C for 1 hour to obtain a clear and transparent yellow perovskite precursor liquid. 28 microliters of the prepared potassium thiocyanate solution was added to 1 ml of the perovskite precursor solution to obtain a 2% (molar ratio) potassium thiocyanate-doped perovskite precursor sol...

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Abstract

The invention relates to the perovskite solar cell field, which provides a perovskite solar cell doped with potassium thiocyanate and a preparation method thereof. A perovskite battery is composed ofFTO conductive glass, an electron transport layer, a perovskite light absorbing layer, a hole transport layer and a metal electrode from bottom to top. The invention aims at solving the problems of poor crystallinity of perovskite and large lag of perovskite battery. potassium thiocyanate is doped in the perovskite light absorbing layer, which can change the crystallization kinetics of perovskite,promote the grain growth, passivate the internal defect state, stabilize the phase structure of perovskite, restrain the ion migration, thus effectively improve the crystallization quality of perovskite, improve the photoelectric efficiency and stability of perovskite battery, and eliminate the hysteresis effect.

Description

technical field [0001] The invention relates to the field of perovskite solar cells, in particular to a perovskite solar cell doped with potassium thiocyanate and a preparation method thereof. Background technique [0002] At present, in the field of solar cells, perovskite solar cells have become a hot research topic due to their high photoelectric conversion efficiency and low preparation cost. Organometal halide perovskite materials, as light-absorbing layers in perovskite cells, have the advantages of high light absorption coefficient, long carrier diffusion distance, ambipolar charge transport properties, and low exciton binding energy. However, because organometallic halide perovskite materials are sensitive to the preparation environment, there are problems of poor crystal quality, many defects, and phase instability, which affects the highlighting of the advantages of perovskite materials and limits the efficiency and stability of perovskite batteries. Therefore, pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/46H01L51/42H01L51/48
CPCH10K71/12H10K30/30H10K2102/00Y02E10/549
Inventor 闫小琴张汝晓李明华席家豪王贯勇
Owner UNIV OF SCI & TECH BEIJING
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