Bridged triphenylamine-based polymer solar battery

A technology of solar cells and polymers, which is applied in the field of polymer solar cells, can solve problems such as absorption spectrum mismatch, efficiency not exceeding 5%, low short-circuit current density, etc., achieve low preparation cost, improve photoelectric conversion efficiency, Effect of Improving Carrier Mobility

Inactive Publication Date: 2013-07-31
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] As an important structural unit in branched polymers, triphenylamine has many advantages and is widely used in the field of optoelectronic materials. Polymer solar cells based on branched triphenylamine have been studied (J.Am.Chem.Soc.2009,131 ,13886–13887, Macromolecules2010,43,5262-5268), but its efficiency failed to exceed 5%
The reason is that the triphenylamine molecule itself twists the benzene ring by about 30° due to the repulsion of the adjacent hydrogen, and its planarity is poor, which makes the HUMO of the polymer higher, which does not match the molecular energy level of the general acceptor material PCBM, resulting in an open circuit Voltage V oc low, and the absorption spectrum does not match the solar spectrum, resulting in a short-circuit current density J sc In addition, the low hole transport rate affects the fill factor FF, which leads to the low photoelectric conversion efficiency of polymer solar cells PSC.

Method used

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  • Bridged triphenylamine-based polymer solar battery
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  • Bridged triphenylamine-based polymer solar battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Synthesis of small molecules

[0029] Synthesis of compound 1

[0030] Add 15.0mL of methyl o-iodobenzoate, 4.50mL of methyl anthranilate, 11.0g of potassium carbonate, 0.45g of activated copper powder, and 0.65g of cuprous iodide into 40mL of diphenyl ether as a solvent. React in an oil bath at 190°C for 48 hours. The solvent diphenyl ether was distilled off under reduced pressure, and then separated and purified by column chromatography. The eluent was dichloromethane:ethyl acetate=15:1. A pale yellow solid was obtained with a yield of 9.82 g and a yield of 67.2%. 1 H-NMR (300MHz, CDCl 3 , δ, ppm) 7.59 (m, 3H), 7.34 (m, 3H), 7.08 (m, 6H), 3.37 (s, 9H).

[0031] Synthesis of compound 2

[0032] Under an argon atmosphere, add 3.00g of magnesium chips to 50mL of anhydrous ether, drop 17.0g of methyl iodide at 0°C, add a small grain of iodine to initiate, and reflux for 1 hour. 4.19 g of compound 1 was dissolved in 50 mL of toluene, slowly dropped into the above...

Embodiment 2

[0053]Wash the ITO glass with deionized water / acetone and then ultrasonically shake it, spin-coat the aqueous solution of PEDOT and PSS on the surface of the ITO glass, spin and centrifuge at 500r / min for 2 minutes, and dry to obtain a composite film of PEDOT:PSS; P1CN and PCBM The mixed o-dichlorobenzene solution with a weight ratio of 1:1 was heated to 110°C and then coated, and then dried in vacuum after rotating and centrifuging at 500r / min for 2 minutes to obtain an active layer composite film; spin-coat PFN on the active layer as a cathode modification layer; finally A layer of 100nm-thick aluminum is vacuum-evaporated as a cathode to obtain a complete polymer solar cell device (P2CN as a donor polymer prepares a polymer solar cell with the same steps as P1CN). The performance comparison of solar cell devices prepared by P1CN and P2CN respectively as donor polymers is shown in Table 1:

[0054] Table 1. Performance of solar cell devices prepared by P1CN and P2CN respecti...

Embodiment 3

[0058] Wash the ITO glass with deionized water / acetone and then ultrasonically shake it, spin-coat the aqueous solution of PEDOT and PSS on the surface of the ITO glass, spin and centrifuge at 500r / min for 2 minutes, and dry to obtain a composite film of PEDOT:PSS; P1CN and PCBM Heat the mixed o-dichlorobenzene solution with a weight ratio of 1:1 to 110°C and apply it, spin and centrifuge at 500r / min for 2 minutes and then dry in vacuum to obtain an active layer composite film, anneal at 100°C for 10 minutes; spin-coat PFN on the active layer As a cathode modification layer; finally, a layer of aluminum with a thickness of 100nm is vacuum evaporated as a cathode to obtain a complete polymer solar cell device (P2CN as a donor polymer prepares a polymer solar cell with the same steps as P1CN). The performance comparison of solar cell devices prepared by P1CN and P2CN as donor polymers is shown in Table 2:

[0059] Table 2. Performance of solar cell devices prepared with P1CN and...

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Abstract

The invention discloses a polymer solar battery comprising an anode, an anode modified layer, an active layer, a cathode modified layer and a cathode, wherein the component of the active layer is a donor macromolecule and receptor PCBM composite membrane with a bulk heterojunction structure. Compared with the donor macromolecule with a triphenylamine structure, which is mainly adopted by an active layer before, the molecule of the polymer solar battery has the outstanding advantages that the twisted triphenylamine is changed into a planar molecule; macromolecule energy gap Eg is reduced; absorption red shift of a visible region can be matched with solar spectrum well; short-circuit current density is increased, the rigidity of a main chain is enhanced; the conjugate degree is increased; the migration ratio of current carriers is increased; the compatibility to the receptor molecule PC71BM is expected to be improved; and fill factors (FF) are increased, so that the photoelectric conversion efficiency is improved. The molecules of the invention are easy to synthesize, the raw materials are low in price and easy to obtain, and the preparation cost is low.

Description

technical field [0001] The invention relates to a polymer solar cell, in particular to a branched-chain polymer based on bridged triphenylamine used as a donor material for the polymer solar cell. Background technique [0002] As energy issues become increasingly prominent, more and more people are turning their attention to energy issues and environmental issues, and solar energy has a greater advantage in renewable energy. The currently commercialized inorganic solar cells based on silicon or other inorganic semiconductors have many disadvantages such as high cost, complicated process, and high energy consumption, which restrict the large-scale popularization and development of solar cells. After decades of development, many technologies have reached bottlenecks, and further improvement is very difficult. At present, the photovoltaic industry is still developing under the condition of government subsidies. [0003] Polymer solar cells have unique advantages in organic pho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/42H01L51/46
CPCY02E10/549Y02P70/50
Inventor 李振余健
Owner WUHAN UNIV
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