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Ternary fullerene organic solar cell

A technology of solar cells and fullerenes, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of poor light absorption capacity of fullerene acceptor materials and poor battery stability, and achieves inhibition of bimolecular charge recombination and low cost. , the effect of reducing grain boundary defects

Inactive Publication Date: 2021-01-22
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the light-absorbing ability of fullerene acceptor materials is poor, so that the process of exciton generation can only rely on the photoexcitation of polymer donors.
In order to overcome the inherent defects of fullerene acceptor materials, broaden the spectral absorption of the photoactive layer, promote charge generation and transport, and improve the short-circuit current density and energy conversion efficiency of fullerene organic solar cells, in recent years, by introducing a third group points, the development of ternary blend organic solar cell technology, the energy conversion efficiency of the battery exceeds 17%, however, the stability of the battery is poor

Method used

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Experimental program
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Effect test

Embodiment 1

[0033] PTB7-Th:TiC8:PC 71 Preparation of BM (mass ratio = 0.7:0.3:1.5) ternary fullerene organic solar cells.

[0034] Treat the clean and transparent conductive anode ITO with ultraviolet ozone for 15 minutes. Prepare PEDOT:PSS (4800rpm, 40s, 30nm) anode buffer layer by spin-coating on its surface, and perform thermal annealing treatment (150°C, 15min); then spin-coat on the anode buffer layer to prepare PTB7-Th:TiC8:PC 71 BM photoactive layer (2000rpm, 60s, 95nm), the mass ratio is 0.7:0.3:1.5; then metal Ca (20nm) and Al (100nm) are sequentially evaporated on the photoactive layer, and the device area is 0.16cm2. Under standard test conditions (AM 1.5, 100mW / cm 2 ), the measured V of the device oc =0.782V,J sc =15.63mA / cm 2 , FF=74.8%, PCE=9.14%.

Embodiment 2

[0036] PTB7-Th:TiC8:PC 71 Preparation of BM (mass ratio = 0.8:0.2:1.5) ternary fullerene organic solar cells.

[0037] Treat the clean and transparent conductive anode ITO with ultraviolet ozone for 15 minutes. Prepare PEDOT:PSS (4800rpm, 30s, 30nm) anode buffer layer by spin coating on its surface, and perform thermal annealing treatment (150°C, 15min); then spin coat PTB7-Th:TiC8:PC on the anode buffer layer 71 BM photoactive layer (2000rpm, 60s, 95nm), the mass ratio is 0.8:0.2:1.5; then metal Ca (20nm) and Al (100nm) are sequentially evaporated on the photoactive layer, and the device area is 0.16cm2. Under standard test conditions (AM1.5, 100mW / cm 2 ), the measured open circuit voltage V of the device oc =0.789V,J sc =18.2mA / cm 2 , FF=72.4%, PCE=10.40%.

[0038] When the device area is 0.06cm2, under standard test conditions (AM 1.5, 100mW / cm 2 ), the measured open circuit voltage V of the device oc =0.789V,J sc =19.4mA / cm 2, FF=72.1%, PCE=11.12%.

Embodiment 3

[0040] PTB7-Th:TiC8:PC 71 Preparation of BM (mass ratio = 0.9:0.1:1.5) ternary fullerene organic solar cells.

[0041] Treat the clean and transparent conductive anode ITO with ultraviolet ozone for 15 minutes. Prepare PEDOT:PSS (4800rpm, 40s, 30nm) anode buffer layer by spin-coating on its surface, and perform thermal annealing treatment (150°C, 15min); then spin-coat on the anode buffer layer to prepare PTB7-Th:TiC8:PC 71 BM photoactive layer (2000rpm, 60s, 95nm), mass ratio 0.9:0.1:1.5; then sequentially evaporate metal Ca (20nm) and Al (100nm) on the photoactive layer, device area 0.16cm2. Under standard test conditions (AM1.5, 100mW / cm 2 ), the measured V of the device oc =0.785V,J sc =17.41mA / cm 2 , FF=72.3%, PCE=9.88%.

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Abstract

The invention discloses a ternary fullerene organic solar cell, and belongs to the technical field of photovoltaics. According to the invention, in an active layer of a binary fullerene bulk heterojunction organic solar cell composed of a polymer donor material (PTB7-Th) and a fullerene acceptor material (PC71BM), an asymmetric thieno isobenzopyran-based (A'-D) 2A type small molecular donor material (TiC8) is added to construct an efficient and stable ternary fullerene organic solar cell with a PTB7-Th:TiC8:PC71BM active layer, wherein the energy conversion efficiency of the device reaches 10.40%, and the energy conversion efficiency of the device is still maintained at 81% of the original energy conversion efficiency after the device is placed in a nitrogen atmosphere for 4500 h; and compared with a binary fullerene organic solar cell, the ternary fullerene organic solar cell of the invention has the advantages that the energy conversion efficiency is improved by 18.3%, and the stability is also remarkably improved.

Description

technical field [0001] The invention belongs to the field of photovoltaic technology, and in particular relates to a high-efficiency and stable ternary fullerene organic solar cell comprising a polymer donor material, a small molecule donor material and a fullerene acceptor material. Background technique [0002] Fullerene organic solar cells are a new class of photovoltaic cells. Compared with traditional inorganic solar cells, it has the advantages of high efficiency, cleanness, no pollution, light weight, low cost, simple preparation, roll-to-roll processing, and flexible large-area preparation. It is a kind of green renewable solar cell with good development prospects. Energy technology has become a research hotspot in the international new energy field. However, the light-absorbing ability of fullerene acceptor materials is poor, so that the process of exciton generation can only rely on the photoexcitation of polymer donors. In order to overcome the inherent defects ...

Claims

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Application Information

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IPC IPC(8): H01L51/42H01L51/46H01L51/48
CPCH10K71/12H10K85/113H10K85/215H10K85/653H10K85/655H10K30/451Y02E10/549
Inventor 朱卫国唐炜朱梦冰张斌谭华刘煜
Owner CHANGZHOU UNIV
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