A kind of translucent organic metal halide perovskite thin film solar cell and its preparation method

A halide perovskite and solar cell technology, applied in the field of solar cells, can solve the problems of low photoelectric conversion efficiency and low surface flatness of perovskite solar cells, and achieve improved photoelectric conversion efficiency, obvious film-forming performance, The effect of grain boundary reduction

Active Publication Date: 2019-01-25
CHANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Purpose of the present invention: to develop a thin film with a thickness of less than 150nm and a high film-forming performance for the problems of low surface flatness, many pinholes, and low photoelectric conversion efficiency of perovskite solar cells caused by the poor preparation process of the perovskite layer film with a thickness of less than 150nm. High-performance translucent perovskite layer thin films to improve the efficiency of perovskite solar cells

Method used

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  • A kind of translucent organic metal halide perovskite thin film solar cell and its preparation method
  • A kind of translucent organic metal halide perovskite thin film solar cell and its preparation method
  • A kind of translucent organic metal halide perovskite thin film solar cell and its preparation method

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Effect test

Embodiment 1

[0033] In comparative example 1 step 4, except PbI 2 and CH 3 NH 3 I joins in the mixed solvent of DMF and DMSO, also adds a certain amount of PVdF-HFP (M W =400000, commercially available), so that its concentration was 5 mg / mL. All the other steps are the same as in Comparative Example 1.

[0034] To the FTO / TiO obtained in embodiment 1 2 / Perovskite structure was characterized by SEM. Its surface SEM figure shows that the perovskite thin film pinhole reduces compared with Comparative Example 1 ( figure 1 b). The I-V curve (under simulated sunlight of AM 1.5G) was tested on the obtained semi-transparent cell, and its efficiency was 8.9% (higher than that of Comparative Example 1).

Embodiment 2

[0036] In Example 1, the concentration of PVdF-HFP in the perovskite precursor solution was adjusted to 12 mg / mL. All the other steps are the same as in Example 1.

[0037] To the FTO / TiO obtained in embodiment 2 2 / Perovskite structure was characterized by SEM. Its surface SEM figure shows that the pinholes of the perovskite film are further reduced than in Example 1, the grain boundaries become blurred, and the grains increase ( figure 1 c), the cross-sectional SEM image shows that the perovskite film has high flatness and a thickness of about 150nm ( figure 2 b). The perovskite thin films obtained in comparative example 1 and the present embodiment were characterized by transient fluorescence, and it was found that the fluorescence lifetime of the perovskite thin films of the present embodiment was higher than that of comparative example 1 ( image 3 ). The I-V curve test (under the simulated sunlight of AM 1.5G) was carried out on the obtained translucent cell, and ...

Embodiment 3

[0039] PbI in the perovskite precursor solution 2 and CH 3 NH 3 The concentration of I was adjusted to 0.25mol / L, and the spin coating conditions of the perovskite precursor solution were changed to: 1000rpm / min for 10s in the first stage, and 7000rpm / min for 55s in the second stage. All the other steps are the same as in Example 2.

[0040] To the FTO / TiO obtained in embodiment 3 2 / The perovskite structure was characterized by SEM, and it was found that the pinholes of the perovskite film were reduced compared with Comparative Example 2, the surface smoothness was good, and the thickness was about 30nm. The I-V curve (under simulated sunlight of AM1.5G) was tested on the obtained semi-transparent cell, and its efficiency was 2.3% (higher than that of Comparative Example 2).

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Abstract

The invention provides a translucent organic metal halide perovskite thin film solar cell and a preparation method thereof. The approach could improve the performance of organometal halide perovskite layers with a thickness below 150 nm, thereby increasing the efficiency of semitransparent perovskite solar cells. By adding poly(vinylidene fluoride-co-hexafluoropropylene) to the organometallic halide perovskite precursor solution, the perovskite precursor and solvent molecules are promoted to form intermediates, and in During the spin coating and annealing process, the transformation of intermediates to perovskite is slowed down, the pinholes of the perovskite layer are reduced, the grain size is increased, the grain boundaries are reduced, the surface is smoother, and the fluorescence lifetime is improved, thus realizing the photoactive layer in the Improved efficiency of semitransparent perovskite solar cells below 150nm. This method is of great significance in the field of solar cells (such as photovoltaic buildings, etc.).

Description

technical field [0001] The invention relates to the field of solar cells, in particular to a translucent organic metal halide perovskite film for improving the efficiency of solar cells and a preparation method thereof. Background technique [0002] Among all kinds of solar cells, organometal halide perovskite cells (hereinafter referred to as perovskite cells) combine low-cost solution processing with excellent photoelectric conversion performance. After just a few years of development, the energy conversion efficiency of laboratory devices has exceeded 22%, which is a type of solar cell with the fastest growing efficiency according to the statistics of the National Renewable Energy Laboratory (NREL), so it is considered to be a very Potential photovoltaic technology. However, perovskite films often suffer from poor surface flatness and more pinholes. The former may cause poor contact between the perovskite film and the charge transport layer, increasing the transfer impe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/42H01L51/46H01L51/48
CPCH10K71/12H10K85/151H10K30/151Y02E10/549Y02B10/10Y02P70/50
Inventor 张帅陆永婷袁宁一丁建宁房香
Owner CHANGZHOU UNIV
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