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Tin-based perovskite thin film, quality improvement method thereof and tin-based perovskite solar cell

A solar cell and quality improvement technology, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of increasing carrier recombination centers, high light absorption coefficient, low exciton binding energy, etc., to reduce trap state density, light The effect of strong absorption characteristics and simple and convenient process

Active Publication Date: 2021-09-17
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the perovskite material prepared by Sn element has a suitable optical band gap (1.2-1.4eV), high light absorption coefficient, low exciton binding energy and high carrier mobility (10 2 -10 3 cm 2 V -1 the s -1 ) and other excellent optical properties stand out among many environment-friendly lead-free perovskites. For example, Yan and his colleagues previously used solvent engineering methods to prepare tin-based perovskite solar cells with a trans-planar heterojunction structure, which were recorded in public documents Liao W, Zhao D, Yu Y, et al. .Lead-free inverted planar formamidinium tin triiodide perovskite solarcells achieving power conversion efficiency up to 6.22%[J].Advanced Materials,2016,28(42):9333-9340. The styrene sulfonate film (hereinafter referred to as PEDOT:PSS) is used as the hole transport layer. However, due to the rapid crystallization nucleation, there are many holes on the surface of the perovskite film, which leads to an increase in the carrier recombination center. The battery based on this Opening voltage and current are suppressed, and the final efficiency is only 6.22%

Method used

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  • Tin-based perovskite thin film, quality improvement method thereof and tin-based perovskite solar cell
  • Tin-based perovskite thin film, quality improvement method thereof and tin-based perovskite solar cell
  • Tin-based perovskite thin film, quality improvement method thereof and tin-based perovskite solar cell

Examples

Experimental program
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Effect test

Embodiment 1

[0057] PEA based on PEDOT:PSS (20 mg / mL) doped with D-sorbitol 0.1 (FA 0.75 MA 0.25 ) 0.9 SnI 3 Perovskite film and its quality improvement method, the method is as follows:

[0058] Step S1: First, weigh 20 mg of D-sorbitol and dissolve it in 1 mL of PEDOT:PSS aqueous solution, and stir for more than 30 minutes to obtain a mixed solution of PEDOT:PSS / D-sorbitol;

[0059] Step S2: After filtering the PEDOT:PSS / D-sorbitol mixed solution with a 0.45 μm water-based filter head, take 120 μL and spin-coat it on the surface of ITO at a speed of 3500 rpm, and transfer the ITO to a hot stage at 100 ° C after 60 seconds Annealed for 30 minutes to prepare an improved hole transport layer;

[0060] Step S3: Then, weigh 372.52mg of stannous iodide, 24.91mg of phenethylamine iodide, 116.08mg of formamidine hydroiodide, 35.77mg of methylamine hydroiodide, and 15.67mg of stannous fluoride, mix and dissolve in 800 μL DMF and 200μL DMSO in a mixed polar solvent, stirred for more than 12h...

Embodiment 2

[0076] Tin-based perovskite solar cell prepared based on the perovskite film described in Example 1

[0077] The operation steps of Example 2 are the same as those of Comparative Example 2, except that the hole transport layer used in Example 2 is the PEDOT:PSS film doped with D-sorbitol as the hole transport layer in Example 1.

[0078] Figure 5 Structural schematic diagram of the solar cell made for comparative example 2 and embodiment 2;

[0079] Figure 6 (a) and (b) are the comparison of the I-V characteristic curves of the perovskite solar cells prepared in Comparative Example 2 and Example 2 respectively under a standard sunlight intensity, wherein the current efficiency of the perovskite solar cells prepared in Example 2 is obvious Higher than Comparative Example 2;

[0080] Figure 7 (a) and (b) are respectively the efficiency tracking of the unpackaged perovskite solar cells prepared in Example 2 and Example 2 under a nitrogen environment, wherein the PEA prepar...

Embodiment 3

[0084] The operation procedure of embodiment 3 is the same as that of embodiment 1, the only difference is that in step S3, when the perovskite precursor solution is configured, the content of phenethylamine iodide salt, formamidine hydriodide and methylamine hydriodide Change to 49.82mg, 103.18mg, 31.80mg respectively in turn to get PEA 0.2 (FA 0.75 MA 0.25 ) 0.8 SnI 3 Perovskite precursor solution.

[0085] The difference between Comparative Example 3 and Example 3 is only whether PEDOT:PSS is doped with (20 mg / mL) D-sorbitol.

[0086] Figure 8 Among them, the test result (b) is based on the PEDOT:PSS / PEA doped with D-sorbitol 0.2 (FA 0.75 MA 0.25 ) 0.8 SnI 3 The XRD characteristic peaks of the film are significantly enhanced compared with (a), indicating that it is more effective than PEA on pristine PEDOT:PSS 0.2 (FA 0.75 MA 0.25 ) 0.8 SnI 3 The thin film has better crystallinity.

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Abstract

The invention provides a tin-based perovskite thin film, a quality improvement method thereof and a tin-based perovskite solar cell. The method comprises the steps: dissolving a polyhydroxy material in a fixed-volume PEDOT:PSS aqueous solution to prepare a mixed solution of PEDOT:PSS and the polyhydroxy material, then carrying out the spin coating of the mixed solution on an electrode, and carrying out the annealing to form a flat and smooth hole transport layer; preparing the tin-based perovskite thin film on the hole transport layer through a one-step spin-coating method, and then forming a flat and compact perovskite thin film without pinholes after annealing treatment. The tin-based perovskite solar cell prepared on the basis of the method has excellent photoelectric conversion efficiency and good device stability.

Description

technical field [0001] The present invention specifically relates to a tin-based perovskite film and its quality improvement method and a tin-based perovskite solar cell, in particular to a tin-based perovskite film based on a polyhydroxy material doped hole transport layer and its quality The improved method and the tin-based perovskite solar cell belong to the technical field of photoelectric materials and devices. Background technique [0002] With economic development and scientific progress, conventional energy sources are gradually being exhausted, and the pressure on environmental protection caused by this is also increasing day by day. Facing this problem, the development and utilization of renewable energy is imminent. Among renewable energy sources, wind energy, water energy, tidal energy, and geothermal energy are greatly affected by geographical and environmental factors, while solar energy basically does not have these restrictions, and is an ideal green renewa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/48H01L51/42H01L51/46
CPCH10K71/15H10K71/12H10K71/40H10K85/00H10K85/1135H10K85/30H10K30/00Y02P70/50
Inventor 陈淑芬陈俊文赵香青申一凡程阳凤
Owner NANJING UNIV OF POSTS & TELECOMM
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