Polymer solar battery with high open-circuit voltage

A solar cell and open-circuit voltage technology, applied in the field of solar cells, can solve the problems of degradation of photoelectric properties of polymers, widening of the band gap, and decline in the overall energy conversion efficiency of solar cells.

Inactive Publication Date: 2010-09-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after reducing the HOMO energy level of the polymer through chemical modification, it is likely to deteriorate other photoelectric properties of the polymer, such as widening the band gap and decreasing mobility, resulting in poor photon absorption efficiency and charge transport efficiency. Polymer solar energy The overall energy conversion efficiency of the battery drops very low

Method used

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  • Polymer solar battery with high open-circuit voltage
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  • Polymer solar battery with high open-circuit voltage

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Using 2,6-bis(trimethyltin)-4,8-bis(2-ethylhexyloxy)benzo[1,2-b:4,5-b']bisthiophene (abbreviation: BDT) and The Stille coupling reaction of N-(2-ethylhexyl)-3,6-dibromobenzimide (abbreviation: PhI) is used to synthesize P(BDT-PhI), and the reaction equation is:

[0017]

[0018] In the formula, R represents 2-ethylhexyl. Among them, BDT was synthesized by the method reported in Journal of the American Chemical Society, 2009, 131, 15586, and PhI was synthesized by the method reported in Journal of the American Chemical Society, 2009, 131, 7206. The synthesis steps of P(BDT-PhI) are:

[0019] Add 20ml of toluene, 0.772g of BDT (1.0mmol) and 0.417g of PhI (1.0mmol) into a 50ml round bottom three-neck flask, stir to dissolve BDT and PhI in toluene, and bubble the solution with nitrogen for 10 minutes, then add 30mg of Pd (PPh 3 ) 4 As a catalyst, nitrogen was sparged for another 20 minutes. The temperature of the reaction system was raised to 110° C., and the reacti...

Embodiment 2

[0022] The transparent conductive glass with strip-shaped ITO (anode) etched on the surface was cleaned with detergent solution, deionized water, acetone and isopropanol by ultrasonic oscillation, dried, and then treated with oxygen plasma for 10 minutes; The aqueous solution of the mixture of PEDOT and PSS is spin-coated on the surface of the conductive glass at a speed of 2000r / min, and dried at 150°C for 15 minutes to obtain a 30nm-thick composite film (anode modification layer) of PEDOT and PSS; then, spin-coat on it The mixed solution of P(BDT-PhI) and PCBM, the rotating speed is 1500r / min, the total concentration of the solution is 20mg / ml, the solvent is chlorobenzene, the weight ratio of P(BDT-PhI) and PCBM is 1:1, spin coating The time is 60 seconds, after the end of spin coating, when the pressure is lower than 1×10 -4 Dry at room temperature under the vacuum of Pa for 2 hours to obtain a composite film (active layer) of P(BDT-PhI) and PCBM with a thickness of 87nm; ...

Embodiment 3

[0026] The transparent conductive glass with strip-shaped ITO (anode) etched on the surface was cleaned with detergent solution, deionized water, acetone and isopropanol by ultrasonic oscillation, dried, and then treated with oxygen plasma for 10 minutes; The aqueous solution of the mixture of PEDOT and PSS is spin-coated on the surface of the conductive glass at a speed of 2000r / min, and dried at 150°C for 15 minutes to obtain a 30nm-thick composite film (anode modification layer) of PEDOT and PSS; then, spin-coat on it The mixed solution of P(BDT-PhI) and PCBM, the rotating speed is 1000r / min, the total concentration of the solution is 20mg / ml, the solvent is chlorobenzene, the weight ratio of P(BDT-PhI) and PCBM is 1:1, spin coating The time is 60 seconds, after the end of spin coating, when the pressure is lower than 1×10 -4 Dry at room temperature under the vacuum of Pa for 2 hours to obtain a composite film (active layer) of P(BDT-PhI) and PCBM with a thickness of 100nm;...

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Abstract

The invention discloses a polymer solar battery with a high open-circuit voltage, which comprises a substrate, an anode, an anode modifying layer, an active layer, a cathode modifying layer and a cathode, wherein the active layer is a composite membrane of a polymer P(BDT-PhI) and PCBM of benzo-bithiophene and imide. By using the characteristics of an ultra-low HOMO energy level, a wide absorption spectrum, high mobility and the like of the P(BDT-PhI), the polymer solar battery prepared by the invention has a very high open-circuit voltage (0.93V), a widened spectral response range and high energy conversion efficiency. Besides, the very low HOMO energy level of the P(BDT-PhI) is also helpful for prolonging the service life of the polymer solar battery.

Description

technical field [0001] The invention relates to a solar cell, in particular to a high open-circuit voltage polymer solar cell. Background technique [0002] Solar energy is an inexhaustible renewable energy source for human beings. Therefore, in today's world where oil prices are rising sharply, mineral resources are increasingly depleted and greenhouse gas emissions are causing climate warming, solar cells that convert solar energy into electrical energy based on the photovoltaic effect are receiving more and more attention. However, the current commercialized solar cells are all inorganic solar cells using silicon or inorganic compound semiconductors as the active layer material. The preparation process is complicated, the cost is high, the weight is heavy, and it is fragile, which seriously restricts the large-scale application of solar cells. In this regard, conjugated polymers with fullerene derivatives (such as PCBM, C 71 -PCBM, etc.) The polymer solar cell with the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/42H01L51/46H01L51/48
CPCY02E10/549
Inventor 施敏敏陈红征陈林陈健汪茫
Owner ZHEJIANG UNIV
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