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Interface modification method of organic metal halide perovskite solar cell

A halide perovskite and solar cell technology, applied in the field of solar cells, can solve problems such as poor stability and low photoelectric conversion efficiency of devices, and achieve strong hydrophobicity and chemical stability, improved stability, and high cell efficiency Effect

Pending Publication Date: 2019-04-26
CHANGZHOU UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems of low photoelectric conversion efficiency and poor stability of devices caused by defects at the interface of perovskite solar cells, the present invention develops a method for modifying perovskite grain interface and perovskite / hole transport by using phthalocyanine molecules The method of layer interface, thereby improving the photoelectric conversion efficiency and stability of the device

Method used

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  • Interface modification method of organic metal halide perovskite solar cell
  • Interface modification method of organic metal halide perovskite solar cell
  • Interface modification method of organic metal halide perovskite solar cell

Examples

Experimental program
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Embodiment 1

[0040] First, 0.25 mg of 2,9,16,23-tetra-tert-butyl-29H,31H-phthalocyanine (AR, commercially available) was weighed and added to 1 ml of anisole, and stirred for 8 h until it was completely dissolved. Next, 85 μl of anisole in which phthalocyanine was dissolved was added dropwise in Step 5 of Comparative Example 1.

[0041] The FTO / TiO that embodiment 1 step 6 prepares 2 / Perovskite film was characterized by SEM, and the surface SEM image is as follows image 3 shown. image 3 It shows that the perovskite film is still composed of perovskite grains, but the gaps between the grains are mostly covered by phthalocyanine, which can make it difficult for water vapor to invade the perovskite film, thereby improving the stability of the battery. The I-V curve test (under the simulated sunlight of AM 1.5G) was performed on the prepared battery, and the efficiency was 19.8%. Under unpackaged conditions, the battery was stored in an atmospheric environment with a humidity of 50%, an...

Embodiment 2

[0043] First, 0.1 mg of 2,9,16,23-tetra-tert-butyl-29H,31H-phthalocyanine (AR, commercially available) was weighed and added to 1 ml of anisole, and stirred for 8 h until it was completely dissolved. Next, 110 μl of anisole in which phthalocyanine was dissolved was added dropwise in Step 5 of Comparative Example 1.

[0044] The I-V curve (under the simulated sunlight of AM 1.5G) was tested on the prepared battery, and the efficiency was 18.5%. Under the unpackaged condition, the battery was stored in an atmospheric environment with 50% humidity, and the efficiency dropped to more than 70% of the original efficiency (13.0%) after 1 week.

Embodiment 3

[0046] First, weigh 1mg of 1,4,8,11,15,18,22,25-octabutoxy-29H,31H-phthalocyanine (AR, commercially available) and add it to 1ml of anisole, stir for 8h until it is completely dissolve. Next, 100 μl of anisole in which phthalocyanine was dissolved was added dropwise in Step 5 of Comparative Example 1.

[0047] The I-V curve test (under the simulated sunlight of AM 1.5G) was performed on the prepared battery, and the efficiency was 18.2%. Under unpackaged conditions, the battery was stored in an atmospheric environment with 50% humidity, and the efficiency dropped to more than 80% of the original efficiency (14.7%) after 1 week.

[0048] Compared with Comparative Example 2, the initial efficiency of the battery modified by phthalocyanine is also higher, and the efficiency decay is slower, indicating that the interface modification effect of phthalocyanine is better than that of C 60 .

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Abstract

The invention belongs to the field of solar cells, in particular relates to an interface modification method of an organic metal halide perovskite solar cell, and provides a method for modifying a perovskite crystal grain interface and a perovskite / hole transport layer interface in the organic metal halide perovskite solar cell. Phthalocyanine is added to an anti-solvent for preparing a battery, and the phthalocyanine molecules are attached to a perovskite crystal grain interface and a perovskite / hole transport layer interface through weak interaction between the phthalocyanine molecules and aperovskite precursor cation. Compared with a perovskite solar cell without phthalocyanine interface modification, the stability of the modified perovskite solar cell under atmospheric environment andillumination is greatly improved, and the corresponding cell efficiency is higher. The method has important significance for the industrialization of the perovskite solar cell in the future. The method can improve the stability of the organic metal halide perovskite layer under atmospheric environment and illumination, and improve the efficiency of the perovskite solar cell.

Description

technical field [0001] The invention belongs to the field of solar cells, in particular to an interface modification method for organic metal halide perovskite solar cells. Background technique [0002] Among all kinds of solar cells, organometal halide perovskite solar cells (hereinafter referred to as perovskite cells) have both low-cost solution processing and excellent photoelectric conversion performance. After 6-7 years of development, the energy conversion efficiency of laboratory devices has exceeded 23%, which is the fastest growing type of solar cell according to the statistics of the National Renewable Energy Laboratory (NREL), so it is considered to be a very Potential photovoltaic technology. However, the efficiency of perovskite solar cells is far from the Schockley-Queisser limit, which may be related to the recombination caused by defects at the interface of perovskite solar cells. In addition, the most commonly used hole transport materials for perovskite ...

Claims

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Application Information

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IPC IPC(8): H01L51/48H01L51/42
CPCH10K71/12H10K71/15H10K71/311H10K30/30Y02E10/549
Inventor 张帅胡志蕾姜禾史超袁宁一丁建宁
Owner CHANGZHOU UNIV
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