Method for regulating and controlling appearance of lead-free perovskite solar cell and solar cell device prepared by the same

A solar cell and lead-free perovskite technology, applied in the field of solar cells, can solve the problems of limitation and high extinction coefficient, and achieve the effect of reducing density defects, less pinhole structure, and improving photoelectric conversion efficiency

Active Publication Date: 2019-02-22
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the perovskite materials used in perovskite solar cells are mainly lead iodide methylamine (CH 3 NH 3 PB 3 ), its energy level band gap is about 1.5eV, and its extinction coefficient is high. A perovskite film with a thickness of several hundred nanometers can fully absorb sunlight below 800nm, and has good

Method used

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  • Method for regulating and controlling appearance of lead-free perovskite solar cell and solar cell device prepared by the same
  • Method for regulating and controlling appearance of lead-free perovskite solar cell and solar cell device prepared by the same
  • Method for regulating and controlling appearance of lead-free perovskite solar cell and solar cell device prepared by the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment one: in tin iodide (SnI 2 ) and formamidine iodine (FAI) to add 0wt% citric acid (CA) additive to control the morphology of lead-free perovskite solar cell devices.

[0024] Step 1: The glass substrate engraved with the ITO electrode is ultrasonically cleaned in deionized water, acetone, and ethanol for 14 minutes each, and then thoroughly cleaned and placed in an ozone plasma processor to clean the surface for 5 minutes;

[0025] Step 2: Preparation of the hole transport layer: Spin-coat the PEDOT:PSS solution on the ITO glass at a speed of 4000 rpm, and then anneal at 130° C. for 20 min.

[0026] Step 3: the preparation of precursor solution: tin iodide (SnI 2 ) and formamidine iodine (FAI) were dissolved in a mixed solvent of dimethylamide (DMF) and dimethyl sulfoxide (DMSO) at a volume ratio of 8:2, and the final molar concentration of the precursor solution was 1.0mol / L , and stirred at room temperature for 2h;

[0027] Step 4: Spin-coat the lead-free...

Embodiment 2

[0030] Embodiment two: in tin iodide (SnI 2 ) and formamidine iodine (FAI) to add 5wt% citric acid (CA) additives to control the morphology of lead-free perovskite solar cell devices.

[0031] The difference from the preparation steps disclosed in Example 1 lies in Step 3, and all other steps and methods are exactly the same as in Example 1.

[0032] Step 3 of this embodiment: tin iodide (SnI) with a molar ratio of 1:1 2 ) and formamidine iodine (FAI) and 5wt% citric acid (CA) additives were dissolved in a mixed solvent of dimethylamide (DMF) and dimethyl sulfoxide (DMSO) at a volume ratio of 8:2, the precursor The final molar concentration of the solution was 1.0mol / L, and stirred at room temperature for 2h.

Embodiment 3

[0033] Embodiment three: in tin iodide (SnI 2 ) and formamidine iodine (FAI) to add 10wt% citric acid (CA) additives to control the morphology of lead-free perovskite solar cell devices.

[0034] The difference from the preparation steps in Example 1 is Step 3, and all other steps and methods are exactly the same as in Example 1.

[0035] Step 3 of this embodiment: tin iodide (SnI) with a molar ratio of 1:1 2) and formamidine iodine (FAI) and 10wt% citric acid (CA) additives were dissolved in a mixed solvent of dimethylamide (DMF) and dimethyl sulfoxide (DMSO) at a volume ratio of 8:2, the precursor The final molarity of the solution was 1.0mol / L, and stirred at room temperature for 2h.

[0036] Embodiment one, the solar cell device prepared in embodiment two and embodiment three carry out the test of photoelectric efficiency, compare the photoelectric conversion efficiency of three kinds of perovskite solar cells, the result is as follows figure 2 shown, from figure 2 I...

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Abstract

The invention discloses a method for regulating and controlling an appearance of a lead-free perovskite solar cell and a solar cell device prepared by the same. When a lead-free perovskite film is prepared, firstly a substrate is spin-coated with a precursor liquid at a rotation speed of 3000-4000 rpm, and annealing is performed at 70-100 DEG C for 10 min; and the precursor liquid is prepared by firstly dissolving tin iodide (SnI2) and formazan iodide (FAI) in a molar ratio of 1:1 and citric acid (CA) additives in different mass ratios in a mixed solvent of DMF and DMSO, and then performing stirring at the room temperature for 2 h. The method regulates and control the appearance of the lead-free perovskite film by changing the mass ratio of the citric acid (CA) additives in the precursor solution; compared with the conventional technology, the obtained lead-free perovskite has a more uniform appearance, and pinhole structures on the film surface is few, the film forming quality is improved, and the density defect is reduced. The photoelectric conversion efficiency of the solar cell device prepared by the method is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to a method for regulating and controlling the morphology of a lead-free perovskite solar cell and a solar cell device prepared. Background technique [0002] In recent years, solid-state organic-inorganic hybrid perovskite cells based on ABX3 as light-absorbing layer and hole-transporting layer have achieved rapid development. This perovskite solar cell has high power conversion efficiency (PCE), low-cost fabrication Excellent performance such as technology has attracted in-depth research by scholars at home and abroad. The energy conversion efficiency of perovskite solar cells has also jumped from the initial 3.8% to 22%, which is close to the energy conversion efficiency of commercial silicon-based solar cells. [0003] For devices with perovskite thin films as active layers, the unit cell growth and surface morphology of perovskite thin films have a great impact ...

Claims

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Application Information

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IPC IPC(8): H01L51/42H01L51/44H01L51/48
CPCH10K71/00H10K30/10H10K30/80Y02E10/549
Inventor 曾文进李志闵永刚崔岱麒唐亚楠邓云恺
Owner NANJING UNIV OF POSTS & TELECOMM
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