Search

CN-122028592-A - Organic solar cell based on dihalogen benzene additive and preparation method thereof

CN122028592ACN 122028592 ACN122028592 ACN 122028592ACN-122028592-A

Abstract

The invention discloses an organic solar cell based on a dihalogen benzene additive, which comprises a transparent conductive substrate ITO, a hole transmission layer, an organic active layer, an electron transmission layer and a metal electrode which are sequentially laminated from bottom to top, wherein the organic active layer comprises a polymer donor PM6, a non-fullerene electron acceptor L8-BO and a dihalogen benzene additive TCBB. According to the organic solar cell based on the dihalogen benzene additive and the preparation method thereof, the dihalogen benzene is used as the active layer additive to be introduced into the active layer of the organic solar cell, and the phase separation degree of a donor-acceptor material is improved by optimizing the aggregation state structure of the active layer film, so that the charge separation and transmission efficiency is improved. The photoelectric conversion efficiency of the organic solar cell prepared by the technical scheme of the invention can reach 20.11%, the organic solar cell is obviously superior to that of a control device of a DIO additive, and the device has good stability.

Inventors

  • XU TAO
  • GUO PU
  • LU ZHOUYI
  • DENG BAOZHONG

Assignees

  • 上海大学

Dates

Publication Date
20260512
Application Date
20260129

Claims (10)

  1. 1. An organic solar cell based on a dihalogen benzene additive is characterized in that the organic solar cell forward device comprises a transparent conductive substrate ITO, a hole transport layer, an organic active layer, an electron transport layer and a metal electrode which are sequentially stacked from bottom to top, wherein the organic active layer comprises a polymer donor PM6, a non-fullerene electron acceptor L8-BO and a dihalogen benzene additive TCBB; the chemical structural formula of the polymer donor PM6 is shown as follows: ; the chemical structural formula of the non-fullerene electron acceptor L8-BO is shown as follows: ; The chemical structural formula of the halogenated additive TCBB is shown as follows: 。
  2. 2. The organic solar cell based on the dihalogen benzene additive as claimed in claim 1, wherein the organic solar cell forward device specifically comprises ITO glass, a 2PACz hole transport layer, an organic active layer, a PNDIT-F3N electron transport layer and a metal Ag cathode which are laminated from bottom to top in sequence.
  3. 3. The organic solar cell based on the dihalogen benzene additive as claimed in claim 1, wherein the mass ratio of PM6 to L8-BO in the organic active layer is 0.4-1:1.2, and the concentration of TCBB is 8mg/ml-12mg/ml.
  4. 4. The organic solar cell based on the dihalobenzene additive according to claim 1, wherein the short-circuit current density of the organic solar cell is 28.45+/-0.19 mA cm -2 , the filling factor is 80.94 +/-0.32% and the energy conversion efficiency is 20.11+/-0.12%.
  5. 5. An organic solar cell based on a dihalobenzene additive according to claim 1, wherein said organic active layer is an active layer.
  6. 6. A method for preparing an organic solar cell based on a dihalogen benzene additive, comprising the steps of: S1, sequentially carrying out ultrasonic treatment on an ITO glass sheet by using a detergent, deionized water, acetone and isopropanol, and then carrying out treatment by using an ultraviolet ozone cleaning machine; s2, adopting a static spin coating method to form a film of 2PACz on an ITO glass sheet, and then carrying out heating annealing treatment to form a hole transport layer; s3, PM6 and L8-BO are dissolved in chloroform solution together according to the mass ratio of (0.4-1) to 1.2, then TCBB is added according to the concentration of 8mg/ml-12mg/ml, then the sample prepared in S2 is transferred into a glove box in nitrogen atmosphere to be heated and stirred, and then the mixture is spin-coated on a hole transport layer 2PACz to form an active layer; s4, dissolving PNDIT-F3N in a mixed solvent of methanol and acetic acid, and forming a film of PNDIT-F3N solution on the active layer by adopting a static spin coating method to form an electron transport layer; s5, evaporating the metal Ag electrode to PNDIT-F3N electron transport layer.
  7. 7. The method for preparing an organic solar cell based on a dihalobenzene additive according to claim 6, wherein the static spin coating in step S2 is performed at a rotational speed of 3000rpm, the annealing temperature is 100 ℃, and the annealing time is 10min.
  8. 8. The method for producing an organic solar cell based on a dihalobenzene additive according to claim 6, wherein in said step S3, the total concentration of PM6, L8-BO added is 16mg/mL.
  9. 9. The method for preparing an organic solar cell based on a dihalogen benzene additive as claimed in claim 6, wherein in the step S3, the spin coating speed is 2000-5000 rpm, the annealing temperature is 90-120 ℃, and the annealing time is 10min.
  10. 10. The method for preparing an organic solar cell based on a dihalobenzene additive according to claim 6, wherein in said step S4, the concentration of the methanol solvent is 1mg/mL, the concentration of the acetic acid solvent is 19mg/mL, the spin-coating speed is 3000rpm, and the spin-coating time is 30S.

Description

Organic solar cell based on dihalogen benzene additive and preparation method thereof Technical Field The invention relates to the technical field of organic electronic materials and devices, in particular to an organic solar cell based on a dihalogen benzene additive and a preparation method thereof. Background The organic solar cell has the outstanding advantages of light weight, flexibility, low cost, solution processing and the like, and has wide application prospect in the field of new energy, so that the organic solar cell becomes one of hot spot directions of current photovoltaic technology research. The active layer is used as a core component of the organic solar cell, and the phase separation morphology and the aggregation state structure of the donor-acceptor material directly determine the charge separation and transmission efficiency and the final photoelectric conversion performance of the device. However, in the existing organic solar cell in the preparation process of the active layer, the problems of uncontrollable separation degree of the donor and the acceptor material, nonuniform size of the phase region, unsmooth charge transmission path and the like generally exist, so that the photoelectric conversion efficiency of the device is difficult to break through the bottleneck, and meanwhile, the stability of the device is still to be improved. Although various additives are tried to improve the appearance of the active layer in the prior art, most of the additives have the defects of high preparation cost, poor compatibility with the active layer material, easiness in residue, reduced device stability, limited lifting effect and the like, and are difficult to meet the requirement of large-scale application of the high-performance organic solar cell. Therefore, the development of the additive which has low cost and high compatibility, can obviously optimize the active layer structure and improve the device performance has great significance for promoting the industrialized development of the organic solar cell. Disclosure of Invention In view of the above-mentioned drawbacks of the prior art, the technical problem to be solved by the present invention is to solve the problems of excessive aggregation or uneven morphology, exciton dissociation inhibition, charge transfer, and the like of the conventional additive DIO for organic solar cells. The invention provides an organic solar cell based on a dihalogen benzene additive and a preparation method thereof, wherein dihalogen benzene is used as an active layer additive to be introduced into an active layer of the organic solar cell, and the phase separation degree of a donor-acceptor material is improved by optimizing the aggregation state structure of an active layer film, so that the charge separation and transmission efficiency is improved. The photoelectric conversion efficiency of the organic solar cell prepared by the technical scheme of the invention can reach 20.11%, the organic solar cell is obviously superior to that of a control device of a DIO additive, and the device has good stability. The additive disclosed by the invention is simple in preparation process, controllable in cost and strong in compatibility, is suitable for preparing high-performance organic solar cells on a large scale, provides a new effective way for improving the performance of organic photovoltaic devices, and has important industrial application value. In order to achieve the above object, the present invention provides an organic solar cell based on a dihalogen benzene additive, the organic solar cell forward device comprising a transparent conductive substrate ITO, a hole transport layer, an organic active layer, an electron transport layer and a metal electrode, which are sequentially stacked from bottom to top, wherein the organic active layer comprises a polymer donor PM6, a non-fullerene electron acceptor L8-BO and a dihalogen benzene additive TCBB; The chemical structural formula of the polymer donor PM6 is shown below: ; The chemical structural formula of the non-fullerene electron acceptor L8-BO is shown as follows: ; The chemical structure of the halogenated additive TCBB is shown below: 。 Further, the organic solar cell forward device specifically comprises ITO glass, a 2PACz hole transport layer, an organic active layer, a PNDIT-F3N electron transport layer and a metal Ag cathode which are sequentially stacked from bottom to top. Further, the mass ratio of PM6 to L8-BO in the organic active layer is 0.4-1:1.2, and the concentration of TCBB is 8mg/ml-12mg/ml. Further, the short-circuit current density of the organic solar cell reaches 28.45+/-0.19 mA cm -2, the filling factor reaches 80.94 +/-0.32%, and the energy conversion efficiency reaches 20.11+/-0.12%. Further, the organic active layer is an active layer. In a preferred embodiment of the present invention, there is provided a method for preparing an organic solar cell based on a dihalobenzene