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Synthesis and Application of a Class of Modified Materials-Triphenylamine Derivatives in Perovskite Solar Cells
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A solar cell and modified material technology, which is applied in the field of perovskite layer modified materials, can solve the problems of perovskite solar cell theoretical research needs to be strengthened, poor battery stability, efficiency attenuation, etc.
Active Publication Date: 2018-06-26
NANJING TECH UNIV
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[0004] Although the development status of perovskite solar cells is good, there are still several key factors restricting the development of perovskite solar cells: 1) the stability of the cells is poor, and the efficiency decays seriously in the atmosphere; 2) the absorber layer contains soluble heavy metal Pb, which is easy to Pollution to the environment; 3) Theoretical research on perovskite solar cells needs to be strengthened
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[0019] Synthesis of modification materials:
[0020] 1. The preparation method of triphenylamine derivative hydroiodate, the general reaction formula is as follows:
[0024] In a 50ml two-necked flask, add 30ml of water, 4-bromophenol (2.00g, 5.78mmol), sodiumhydroxide (0.96g, 24.0mmol), 1,2-dibromoethane (5.0ml, 34.6mmol), and reflux Reaction for 17h. After the reaction, it was extracted three times with dichloromethane, the organic phases were combined, and an appropriate amount of anhydrous MgSO was added 4 , Let stand for half an hour. Filter to remove MgSO 4 , Rotary evaporation to remove dichloromethane, chromatographic column separation and purification (petroleumether is the eluent) to obtain a white solid with a yield of 65%. 1 H NMR(300MHz; CDCl 3 ): δ 3.63 (t, 2H), 4.26 (t, 2H), 6.80 (d, 2H), 7.39 (d, 2H).
[0038] Preparation and characterization of solar cells:
[0039] (1) Use a mixture of dilute hydrochloric acid and zincpowder to etch the ITO substrate cut into 1.5cm x 1.5cm, wipe it with a cotton ball after etching, rinse with water, sonicate deionized water for 15 minutes, and clean the surface with acetone. Blow dry with nitrogen and irradiate in UV-ozone for 20 minutes.
[0040] (2) ITO / PEDOT with modified layer devices: PSS / perovskite / modified materials / PCBM / C 60 / BCP / Al preparation:
[0041] First, PEDOT: PSS was spin-coated on the treated ITO substrate, annealed at 120°C for 30 minutes; then 1M lead iodide (PbI 2 ) The solution is spin-coated on the ITO / PEDOT: PSS, and then a layer of methyl ammoniumiodide is spin-coated immediately, and then annealed at 100°C for about 5 minutes; then the modified material is spin-coated; then the prepared PCBM Spin-coated the dichlorobenzene solution on the perovskite, and place it at room temperature for more than 10 minutes; finally, t...
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Abstract
This patent mainly designs and synthesizes a class of triphenylamine derivatives, which are used as modification materials to modify the interface of the perovskite / electrontransport layer in the inverted structure. The specific method is to increase the stability of the perovskite layer by spin-coating a layer of modified materials on the perovskite film, using the interaction of the amine groups in the molecular structure, I-ions and the inorganic Pd2+ in the perovskite layer, and using the molecular The benzene ring and alkyl chain components in the structure improve interfacial compatibility, reduce surface defects, and introduce dipole moments to regulate interface energy levels, improve carrier injection efficiency, and finally realize high-performance solar cells. Note: n = 1-16.
Description
Technical field [0001] The invention relates to the design and synthesis of the chemical structure of a triphenylamine derivative and its application as a perovskite layer modification material in a perovskite solar cell. Background technique [0002] Currently, energy and environmental problems are becoming more and more serious, and it is urgent to replace traditional energy with clean renewable energy. Reasonable use of solar energy is an effective means to solve this problem. An effective way to convert solar energy into electrical energy is to prepare solar cells based on the photovoltaic effect. [0003] Solar cells include first-generation crystalline silicon solar cells (85% market share), second-generation thin-film solar cells, and third-generation solar cells based on solution preparation processes. The efficiency of third-generation solar cells has not surpassed that of silicon-based cells, but in recent years, a new type of solar cell using perovskites as photoactive...
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