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High-efficiency ternary organic solar cell

An organic solar cell, high-efficiency technology, applied in the field of solar cells, can solve problems such as damage, limiting the battery short-circuit current density and efficiency improvement, and limiting the efficiency improvement of ternary cells.

Active Publication Date: 2018-08-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding the third component to the binary blend film will easily cause damage to the original good morphology and affect the generation and transmission of photogenerated charges, thus limiting the increase in short-circuit current density and efficiency of the battery
On the other hand, in order to broaden the range of light absorption, the third component in the ternary battery must be an electron donor or acceptor with a narrower band gap than the original binary material system, such as a material that absorbs strongly in the near-infrared region. The narrowing of the gap means that the HOMO energy level of the material increases and (or) the LUMO energy level decreases, so it is easy to cause a significant decrease in the open circuit voltage of the battery, which also limits the improvement of the efficiency of the ternary battery.
Therefore, how to greatly increase the short-circuit current density in ternary organic solar cells while maintaining a high open-circuit voltage is a big challenge.

Method used

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Examples

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Effect test

Embodiment 1

[0019] The transparent conductive glass with strip-shaped ITO (cathode) etched on the surface was cleaned by ultrasonic oscillation with cleaning agent, deionized water, acetone and isopropanol in turn, dried, and then treated with ultraviolet ozone for 15 minutes; then on the surface of the conductive glass A layer of ZnO was spin-coated at 3500 rpm, the spin-coating time was 60 seconds, and then annealed at 170 °C for 20 minutes. The wafers were then transferred to a glove box, and a layer of PFN was spin-coated on ZnO with a 0.4 mg / mL PFN solution at 3000 rpm for a spin-coating time of 60 s. After that, spin-coat PBDB-T and HF-PCIC with a weight ratio of PBDB-T:HF-PCIC of 1:1 and a total concentration of 20 mg / mL for 60 seconds at a speed of 2000 rpm to obtain a layer of 100 nm thick active layer. Finally, a layer of MoO with a thickness of 10 nm was evaporated with an evaporation apparatus. 3 interface layer and 100nm thick Ag electrode (anode), resulting in an active ar...

Embodiment 2

[0022] The transparent conductive glass with strip-shaped ITO (cathode) etched on the surface was cleaned by ultrasonic oscillation with cleaning agent, deionized water, acetone and isopropanol in turn, dried, and then treated with ultraviolet ozone for 15 minutes; then on the surface of the conductive glass A layer of ZnO was spin-coated at 3500 rpm, the spin-coating time was 60 seconds, and then annealed at 170 °C for 20 minutes. The wafers were then transferred to a glove box, and a layer of PFN was spin-coated on ZnO with a 0.4 mg / mL PFN solution at 3000 rpm for a spin-coating time of 60 s. After that, spin-coat the PBDB-T and HF-PCIC mixture with a weight ratio of PBDB-T:HF-PCIC of 1:1.2 and a total concentration of 20 mg / mL for 60 seconds at a speed of 2000 rpm to obtain a layer of 100 nm thick active layer. Finally, a layer of MoO with a thickness of 10 nm was evaporated with an evaporation apparatus. 3 interface layer and 100nm thick Ag electrode (anode), resulting i...

Embodiment 3

[0025]The transparent conductive glass with strip-shaped ITO (cathode) etched on the surface is cleaned with cleaning agent, deionized water, acetone and isopropanol by ultrasonic oscillation, dried, and then treated with ultraviolet ozone for 15 minutes; A layer of ZnO was spin-coated at 3500 rpm for 60 seconds, and then annealed at 170° C. for 20 minutes. Then the sheet was transferred to a glove box, and a layer of PFN was spin-coated on the ZnO with a 0.4 mg / mL PFN solution at a rotation speed of 3000 rpm and a spin-coating time of 60 seconds. Afterwards, the PBDB-T:HF-PCIC weight ratio of 1:1.5, the total concentration of 20mg / mL of PBDB-T, HF-PCIC mixture, with the speed of 2000rpm, spin coating for 60 seconds, to obtain a layer of 100nm thick active layer. Finally, a layer of MoO with a thickness of 10 nm was evaporated with an evaporation apparatus. 3 interface layer and a 100nm thick Ag electrode (anode), resulting in an effective area of ​​6mm 2 organic solar cell...

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Abstract

The invention discloses a high-efficiency ternary organic solar cell which comprises a substrate, a cathode, a cathode modification layer, an active layer, an anode modification layer and an anode. The active layer includes a blend film of a polymer electron donor PBDB-T and two types of micro-molecular electron acceptors HF-PCIC and IEICO-4F. The morphology of the active layer is optimized via complementary absorption of the PBDB-T, HF-PCIC and IEICO-4F, especially IEICO-4F. The prepared ternary organic solar cell realizes excellent photoelectric response in the wide spectrum range of 300-1000nm, and compared with a binary organic solar cell based on PBDB-T:HF-PCIC, the short-circuit current density is improved by 7.2MA / cm2, and the highest power conversion efficiency PCE reaches 11.2% which is 8.82% higher than that of the binary cell. In addition, the ternary organic solar cell has a very low energy loss (0.59eV), so that the cell has a higher open-circuit voltage.

Description

technical field [0001] The present invention relates to solar cells, in particular to a high-efficiency ternary organic solar cell. Background technique [0002] The active layer of traditional organic solar cells is a binary blend film composed of an electron donor and an electron acceptor (binary organic solar cells). However, due to the discontinuous energy level structure of organic electron donors and electron acceptors, it is difficult for binary blend films to obtain a wide and strong spectral absorption range, which limits the solar absorption and utilization of cells, and the short-circuit current density cannot Comparable to inorganic solar cells with continuous energy level structures (energy bands) such as monocrystalline and polycrystalline silicon solar cells. To this end, people add a third component (either an electron donor or an electron acceptor) that is complementary to the absorption of the original binary blend film into the binary organic solar cell, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/42H01L51/44H01L51/46
CPCH10K85/00H10K30/80H10K30/00Y02E10/549
Inventor 陈红征占玲玲李水兴施敏敏
Owner ZHEJIANG UNIV
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