Preparation method and application of improved tin-based perovskite thin film

An improved perovskite technology, which is applied in the field of preparation of improved tin-based perovskite thin films, can solve problems such as excessively fast crystallization of tin-based perovskite, low performance of solar cells, and non-dense thin films, and achieve excellent crystallization Sexuality and vertical orientation, suppression of surface defects, good repeatability

Pending Publication Date: 2022-01-28
SHANGHAI TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem solved by the present invention is: in the existing tin-based perovskite thin film preparation method, the tin-based perovskite crystallizes too fast, resulting in the prepared thin film being not dense, poor in morphology and low in performance of the corresponding solar cell, etc. question

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  • Preparation method and application of improved tin-based perovskite thin film
  • Preparation method and application of improved tin-based perovskite thin film
  • Preparation method and application of improved tin-based perovskite thin film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of an improved tin-based perovskite film and solar cell:

[0034] Step 1: Cut the ITO conductive glass into square pieces with a side length of 2.5cm, and ultrasonically in 2% (volume ratio) Triton X-100 ultrapure aqueous solution, absolute ethanol, ultrapure water, and absolute ethanol Wash for 30 minutes each. After purging with nitrogen, it was cleaned with UV-ozone for 20 minutes. The PEDOT:PSS solution was dropped on the above-mentioned ITO conductive glass, spin-coated at 5000rpm for 45s, and annealed at 135°C for 20 minutes to obtain an ITO substrate containing a hole transport layer.

[0035] Step 2: 298mg (0.80mmol) stannous iodide, 117mg (0.68mmol) formamidine hydroiodide, 30mg (0.12mmol) phenethylamine hydroiodide and 52mg (0.40mmol) 1,3-dimethyl The imidazolidine-2-thione was dissolved in a mixed solvent composed of 800 μL N,N-dimethylformamide and 200 μL dimethyl sulfoxide to obtain a perovskite precursor solution containing cyclic thione.

...

Embodiment 2

[0042] Preparation of an improved tin-based perovskite film:

[0043] Step 1: Same as in Example 1 above.

[0044]Step 2: 298mg (0.80mmol) stannous iodide, 117mg (0.68mmol) formamidine hydroiodide, 30mg (0.12mmol) phenethylamine hydroiodide, 47mg (0.36mmol) 1,3-dimethyl A mixture consisting of imidazolidine-2-thione and 5 mg (0.04 mmol) 1,3-dimethylimidazoline-2-thione dissolved in 900 μL N,N-dimethylformamide and 100 μL dimethyl sulfoxide solvent to obtain a perovskite precursor solution containing cyclic thioketones.

[0045] Step 3: Add the precursor solution prepared in step 2 onto the ITO substrate obtained in step 1 under nitrogen atmosphere. First spin coating at 1000rpm for 10s, then spin coating at 5000rpm for 34s, during which 600μL of toluene was injected to form a light brown transparent film layer, as figure 1 as shown in c. After the spin coating, it was annealed at 80° C. for 10 min to obtain a perovskite film containing 1,3-dimethylimidazoline-2-thione.

...

Embodiment 1

[0048] Preparation of a tin-based perovskite thin film and solar cell:

[0049] Step 1: Same as in Example 1 above.

[0050] Step 2: Dissolve 298mg (0.80mmol) stannous iodide, 117mg (0.68mmol) formamidine hydriodide, 30mg (0.12mmol) phenethylamine hydriodide in 800μL N,N-dimethylformamide and 200 μL dimethyl sulfoxide to obtain a perovskite precursor solution without thione compounds.

[0051] Step 3: Add the precursor solution prepared in step 2 onto the ITO substrate obtained in step 1 under nitrogen atmosphere. First spin coating at 1000rpm for 10s, then spin coating at 5000rpm for 30s, injecting 600μL of toluene during this period to form a dark brown, rough and whitish film, as figure 1 as shown in a. After the spin coating, it was annealed at 70° C. for 10 min to obtain a tin-based perovskite film without thioketone compound.

[0052] The scanning electron microscope results of the tin-based perovskite thin film prepared above are as follows: figure 2 As shown in a...

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Abstract

The invention discloses a preparation method and application of an improved tin-based perovskite thin film. The preparation method comprises the following steps: preparing a hole transport layer on cleaned conductive glass; preparing a precursor solution containing a cyclic thioketone compound and a tin-based perovskite material; spin-coating the precursor solution, generating a perovskite thin film in one step by using an anti-solvent, and carrying out annealing to obtain the tin-based perovskite thin film. The cyclic thioketone compound is introduced into the coating precursor solution and can effectively coordinate with tin ions, so that the crystallization rate of a tin-based perovskite material is greatly slowed down, and the smooth and compact tin-based perovskite thin film with passivated surface defects is obtained; according to the tin-based perovskite solar cell prepared from the thin film, the photoelectric conversion performance, the stability and the process repeatability of the tin-based perovskite solar cell are remarkably improved, and the maximum photoelectric conversion efficiency exceeds 12%.

Description

technical field [0001] The invention relates to a method for preparing an improved tin-based perovskite film and its application, in particular to a method for preparing a tin-based perovskite film improved by using a cyclic thione compound and a solar cell, belonging to optoelectronic materials and devices technology field. Background technique [0002] Halide perovskite is a large class of new semiconductor materials with excellent photoelectric conversion performance. Among them, the preparation technology of lead-containing perovskite solar cells is becoming more and more mature, and the photoelectric conversion efficiency in the laboratory has exceeded 25%. However, the severe biological and environmental toxicity of lead limits the large-scale promotion of lead-containing perovskite solar cells, and tin, which is in the same main group as lead and is biofriendly, is the most suitable substitute element for lead in perovskite materials. However, under the current techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/00H01L51/42H01L51/44H01L51/46
CPCH10K71/12H10K71/40H10K85/654H10K30/00H10K30/88Y02E10/549
Inventor 米启兮朱子豪
Owner SHANGHAI TECH UNIV
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