Carbon-based perovskite solar cell based on multifunctional interface modification layer

An interface modification layer, solar cell technology, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of interface contact and recombination, non-radiative recombination of light absorbing layer, instability, etc., and achieve high power conversion efficiency and good stability. , the effect of high repetition rate

Inactive Publication Date: 2020-01-10
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

The current power conversion efficiency of solar cells (PSC) based on perovskite materials has exceeded 24%. Despite the rapid development, there are still some problems in perovskite solar cells, such as interface contact and recombination problems in the structure, Non-radiative recombination and instability of the light-absorbing layer, etc.

Method used

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  • Carbon-based perovskite solar cell based on multifunctional interface modification layer
  • Carbon-based perovskite solar cell based on multifunctional interface modification layer
  • Carbon-based perovskite solar cell based on multifunctional interface modification layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Preparation of electron transport layer:

[0035] 15wt.% SnO 2 The colloidal dispersion was diluted to 2.67wt.%, and coated on clean ITO conductive glass by spin coating, and a dense layer of SnO was formed after annealing at 150°C for 30min. 2 Thin film (30nm thickness).

[0036] 2) Preparation of alkali metal hydroxide layer:

[0037] Dissolve KOH powder (>99.99%) in deionized water and prepare a 20mM aqueous solution. After stirring for 1-2h, take 60uL and spin-coat the SnO in step 1). 2 On the film, a dense KOH film (5nm thickness) was formed after annealing at 100°C for 10 minutes.

[0038] 3) Preparation of perovskite layer:

[0039] Add cesium bromide and lead iodide into DMSO at a molar ratio of 1:1, stir for 1 h, and prepare a perovskite solution with a molar content of 1.0. After stirring for 12 h at room temperature, a clear and transparent yellow perovskite precursor solution was obtained. In the glove box, take 50uL precursor solution and adopt one...

Embodiment 2

[0047] Example 2 of the present invention is basically the same as Example 1, except that KOH is replaced by NaOH.

[0048] 1) Preparation of electron transport layer:

[0049] 15wt.% SnO 2 The colloidal dispersion was diluted to 2.67wt.%, and coated on a clean FTO conductive glass by spin coating, and a dense layer of SnO was formed after annealing at 150°C for 30 minutes. 2 film.

[0050] 2) Preparation of alkali metal hydroxide layer:

[0051] Dissolve NaOH powder (>99.99%) in deionized water to prepare a 10mM aqueous solution. After stirring for 1-2h, take 60uL and spin-coat the SnO in step 1). 2 On the film, a dense NaOH film was formed after annealing at 100°C for 10 min.

[0052] 3) Preparation of perovskite layer:

[0053] Add cesium bromide and lead iodide into DMSO at a molar ratio of 1:1, stir for 1 h, and prepare a perovskite solution with a molar content of 0.8. After stirring for 12 h at room temperature, a clear and transparent yellow perovskite precursor ...

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Abstract

The invention discloses a carbon-based perovskite solar cell based on a multifunctional interface modification layer, which belongs to the field of photoelectric devices, and particularly relates to alkali metal hydroxide as an interface modification layer between an electron transport layer and a perovskite light absorption layer and used for a perovskite solar cell. The carbon-based perovskite solar cell based on the multifunctional interface modification layer structurally comprises a transparent conductive substrate, an electron transport layer, a perovskite layer and a carbon electrode. Alkali metal hydroxide is modified between the electron transport layer and the perovskite layer mainly by a coating method. The modification layer improves the film forming quality of the perovskite layer by reducing the interfacial tension and the work function of the electron transport layer so as to promote carrier transport between interfaces and weaken non-radiative recombination in the film.The photoelectric conversion efficiency and the open-circuit voltage of the all-inorganic carbon-based perovskite solar cell integrated by the method are remarkably improved, and the stability and the hysteresis effect are remarkably improved.

Description

technical field [0001] The invention belongs to the field of perovskite solar cells, and specifically relates to the use of carbon-based perovskite solar cells as the main body, depositing alkali metal hydroxide between the electron transport layer and the perovskite layer as a multifunctional interface modification layer and its application in photovoltaic power generation Applications. [0002] technical background [0003] With the rapid development of the global economy and the continuous growth of the world population, the global energy demand continues to rise, while the increasingly depleted traditional fossil energy is difficult to meet the needs of human production and life, which in turn seriously hinders the development of the world economy and people's living standards improvement. Finding green and renewable energy to replace traditional fossil energy is a common challenge faced by all human beings. Solar energy is the source of all energy on the earth, and it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/42H01L51/44H01L51/46
CPCH10K30/10H10K30/81H10K2102/00Y02E10/549
Inventor 郑言贞邓飞李席涛吕心顶陈英初陶霞
Owner BEIJING UNIV OF CHEM TECH
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