tio 2 Doped material and its preparation method and application

A technology of doping material and perovskite, applied in the field of solar cells, can solve problems such as hindering the improvement of cell efficiency, inability to absorb near-infrared light, and large energy loss of incident light, so as to improve cell conversion efficiency, expand the spectral response range, The effect of even size distribution

Active Publication Date: 2020-11-24
HENAN UNIVERSITY
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Problems solved by technology

One is the recombination of photogenerated electrons and holes at the interface between the electron transport layer and the perovskite active layer; the other is that perovskite solar cells can only absorb a small part of the solar spectrum and cannot absorb near-infrared light, and the energy loss of incident light is very large. Large, which hinders the further improvement of battery efficiency

Method used

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  • tio <sub>2</sub> Doped material and its preparation method and application
  • tio <sub>2</sub> Doped material and its preparation method and application
  • tio <sub>2</sub> Doped material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1. TiO 2 Preparation of doped materials

[0045] (1) Preparation of solution A: 0.5 ml of tetrabutyl titanate and 0.15 ml of acetylacetone were mixed and stirred for 1 hour, and then 7 ml of isopropanol was added.

[0046] (2) Preparation of solution B: Add 0.03ml of nitric acid and 0.07ml of deionized water into 2.7ml of isopropanol, mix and stir for 1 hour.

[0047] (3) Add solution B dropwise to solution A, and magnetically stir for 7 hours to obtain light yellow TiO 2 Precursor solution C.

[0048] (4) Er(NO 3 ) 3 ·5H 2 O, Yb(NO 3 ) 3 ·5H 2 O and LiNO 3 Add solution C to obtain mixed solution D, so that the molar ratios of Er, Yb, Li and Ti in the mixed solution are 0.5:100, 10:100, and 20:100, respectively. Stir magnetically for 2h to dissolve completely.

[0049] (5) Remove the solvent and dry the solution D at 100° C. for 12 hours. Then anneal at 500°C for 30 minutes (can be selected between 30 and 90 minutes) to obtain TiO 2 doped material. ...

Embodiment 2

[0052] Embodiment 2. Preparation of perovskite solar cells

[0053] (1) Cleaning the conductive glass (FTO): put the conductive glass in acetone, isopropanol and ethanol in sequence, ultrasonically clean it for 30 minutes each, and then irradiate it with UV for 20 minutes.

[0054] (2) Add 350 μl of isopropyl titanate to 5 ml of absolute ethanol, then add a small amount of HCl (concentration: 0.013M), mix and stir for 2 hours to obtain a dense layer precursor solution. Then the precursor solution was spin-coated on the FTO at a speed of 2000 rpm, and annealed at 500° C. for 30-60 min to obtain a conductive glass with a dense layer.

[0055] (3) TiO 2 The slurry (Dyesol 30NR-D) was diluted with absolute ethanol (1:6, mass ratio), and the diluted TiO 2 The slurry is spin-coated on the dense layer at a speed of 4000 rpm, and annealed at 450° C. for 30 minutes (30 to 60 minutes can be selected) to obtain a conductive glass with a mesoporous layer.

[0056] (4) The above prepare...

Embodiment 3-5

[0066] Example 3-5. TiO 2 Preparation of doped materials

[0067] Prepare TiO by the same method as in Example 1 2 The difference of the doping material is that in step (4), the molar ratios of Er, Yb, Li and Ti are respectively 0.5:10:X:100, wherein X is 0, 15, 20 or 25 respectively.

[0068] In step (5), when X is 0, 15, 20 or 25, the solution D is desolvated and dried for 12 hours at 80° C., 90° C., and 120° C. respectively. Then anneal at 450°C, 480°C, and 550°C for 40, 60, and 120 minutes to obtain TiO 2 doped material.

[0069] For the TiO prepared above 2 Doping material, and the TiO prepared in embodiment 1 2 The doped material was analyzed and the results were as follows Figure 5 as shown, Figure 5 are different Li + Doping concentration TiO 2 The up-conversion luminescence diagram of the doped material (Er:Yb:Li:Ti=0.5:10:x:100, x=0,15,20,25), the excitation light source is a 980nm laser. Thanks to Li + The addition of TiO 2 The up-conversion luminescen...

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Abstract

The present invention relates to a kind of TiO 2 Doping material and its preparation method and application, said TiO 2 The general chemical formula of the dopant material is Er X Yb Y Li Z Ti H o 2 , where: the range of X is: 0.001≦X≦0.005, the range of Y is: 0.05≦Y≦0.1, the range of Z is: 0.1≦Z≦0.2, H means 1‑0.75X‑0.75Y‑0.25Z; TiO prepared by invention 2 The doped material has dual functions, which can be used as an interface modification layer to reduce the recombination of photogenerated charges at the interface between the electron transport layer and the perovskite active layer; at the same time, it has the function of upconversion luminescence, converting near-infrared light into perovskite absorbable Visible light expands the spectral response range of perovskite cells, thereby improving cell conversion efficiency; the prepared TiO 2 The doping material is applied to perovskite solar cells, and the size distribution of the prepared nanoparticles is uniform, and there will be no problem of particle aggregation.

Description

technical field [0001] The present invention relates to a kind of TiO 2 The doping material and its preparation method and application belong to the technical field of solar cells. Background technique [0002] Perovskite solar cells have attracted much attention due to their advantages of high efficiency, low cost, and simple preparation methods. In just a few years, the efficiency of perovskite cells has increased from 3.8% to the current 22.1% (J.Am.Chem.Soc., 2009, 131:6050; Science, 2016, 353:58; Science, 2015, 350 :944; Science, 2017, 356:1376). However, in order to further improve the conversion efficiency of perovskite solar cells, there are some key issues affecting the efficiency improvement that need to be resolved. One is the recombination of photogenerated electrons and holes at the interface between the electron transport layer and the perovskite active layer; the other is that perovskite solar cells can only absorb a small part of the solar spectrum and can...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/42H01L51/46H01L51/48
CPCH10K30/151H10K2102/101Y02E10/549
Inventor 张振龙石文佳毛艳丽
Owner HENAN UNIVERSITY
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