CN111883659A - Efficient ternary organic solar cell prepared based on step-by-step deposition method - Google Patents
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Abstract
The invention discloses a high-efficiency ternary organic solar cell prepared based on a step-by-step deposition method, which comprises a substrate, an anode modification layer, an active layer, a cathode modification layer and a cathode from bottom to top, wherein the active layer is formed by sequentially depositing a layer of wide-bandgap polymer donor (PM6) film and a layer of non-fullerene receptor complex (mixture of BO-4Cl and BTP-S2) film on the anode modification layer by adopting a spin coating process. By utilizing the poor compatibility between BTP-S2 and PM6 and the large shearing force during film forming by a spin coating process, the active layer can have an ideal P-i-N morphology structure, namely, a donor rich phase is formed at the interface of an anode modification layer, an acceptor rich phase is formed at the interface of a cathode modification layer, and a body heterojunction thick film in which a donor and an acceptor are uniformly mixed is arranged in the middle. Therefore, the ternary organic solar cell obtained by the invention realizes high-efficiency generation and high-efficiency collection of photocurrent, and the PCE is higher than that of a corresponding bulk heterojunction ternary cell and obtains the highest efficiency (18.50%) of the organic solar cell so far.
Description
Technical Field
The invention relates to the technical field of solar cells, in particular to a high-efficiency ternary organic solar cell prepared based on a step-by-step deposition method.
Background
Organic solar cells have gained rapid improvements in energy conversion efficiency in recent years, benefiting from the advent of Y-series electron acceptors. The energy conversion efficiency of the single-junction battery has broken through 18 percent at present (Science Bulletin 2020,65, 272).
In addition to the development of new materials, the topography control of the active layer is also a critical factor in determining device performance. The purpose of the profile control is to enable photocurrent to be efficiently generated in the active layer and efficiently collected by the electrode. At present, people generally adopt a spin coating process to obtain the morphology structure of an active layer of a Bulk Heterojunction (BHJ), namely, an electron donor and an electron acceptor are simultaneously dissolved in a solvent, and a mixed solution is spin-coated to obtain the active layer. Because a large shearing force is generated by the violent centrifugal action during spin coating film forming, the donor and the receptor in the active layer can be fully mixed and uniformly distributed, so that a large donor/receptor interface (bulk heterojunction) is provided, and the high-efficiency generation of charges is facilitated. However, this morphology is not conducive to efficient charge collection: when holes move along the transport channels constructed for the donor phase towards the anode and electrons move along the transport channels constructed for the acceptor phase towards the cathode, the large donor/acceptor interface increases the risk of recombination of the two photo-generated charges (electrons and holes) during transport. Therefore, along the charge transmission direction, a donor/acceptor concentration gradient is formed in the active layer, i.e., the donor concentration gradually increases from the interface of the cathode modification layer to the interface of the anode modification layer, and the acceptor concentration gradually decreases, so that the vertical phase distribution can greatly inhibit charge recombination, greatly improve the collection efficiency of the electrode on photo-generated charges, and further improve the photovoltaic performance of the device (Journal of the American Chemical Society 2018,140,7159; Energy & Environmental Science 2019,12, 384).
Therefore, a Layer-by-Layer (LbL) method has been developed to sequentially form a film of a donor material and an acceptor material, thereby achieving effective vertical phase distribution control. Common step-wise deposition processes are: 1) orthogonal solvent processes (advanced materials 2019,31,1808153), the upper solvent must be capable of swelling but not dissolving the lower material. Therefore, the method has great limitation, high requirements on material system and solvent selection and no universality; 2) the knifing film forming process (Joule2020,4,407) comprises the steps of knifing a donor and an acceptor in sequence to form a film, and reducing the interdiffusion degree between an upper film and a lower film by utilizing the shearing force which is much smaller than that of the spin coating process during film forming. However, this method requires a lot of time to adjust the coating parameters, and the process is complicated and non-uniform. Based on the above limiting factors, the organic solar cell related to the step-by-step deposition method has not been studied much, and the maximum efficiency of the organic solar cell prepared by the step-by-step deposition method is 16.5% (Nat Commun 2020,11,2855) and is far less than the maximum efficiency of the organic solar cell with the bulk heterojunction structure by 18.22% (Science Bulletin 2020,65, 272). Therefore, a simple and universal step-by-step deposition process is obtained to realize effective regulation and control of the longitudinal component gradient in the active layer, and the method has important research and application values for expanding the application range of the step-by-step deposition method and further improving the efficiency of the organic solar cell device.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an effective strategy for gradually depositing an active layer by a simple spin coating process so as to realize a high-efficiency ternary organic solar cell with ideal longitudinal component gradient in the active layer.
The high-efficiency ternary organic solar cell comprises a substrate, an anode modification layer, an active layer, a cathode modification layer and a cathode from bottom to top, wherein the active layer is formed by depositing an electron donor film and an electron acceptor compound film on the anode modification layer in sequence by adopting a spin coating process.
The electron donor is a wide-band-gap polymer donor PM6, the electron acceptor compound is formed by mixing two non-fullerene acceptors BO-4Cl and BTP-S2 according to different proportions, and the chemical structural formulas of the polymer donor and the non-fullerene acceptors are as follows:
the electron donor film is formed by spin coating of a PM6 solution with the concentration of 6-10mg/mL, the electron acceptor composite film is formed by spin coating of a non-fullerene acceptor mixture (BO-4Cl and BTP-S2) solution with the total concentration of 6-10mg/mL, and the total thickness of the active layer is 50-200 nm. When the proportion of BTP-S2 in the total weight of the acceptor mixture is 15-75%, the effect of the prepared ternary organic solar cell is very excellent, and especially when BTP-S2 accounts for 25% of the total weight of the acceptor mixture, the effect is optimal.
And an additive is added into the electron acceptor composite film during film formation, wherein the additive is 1, 8-Diiodooctane (DIO), and the volume of the additive is 0.2-1% of that of the non-fullerene acceptor mixture solution.
The active layer is annealed at the temperature of 80-200 ℃ for 5-60 min.
Typically, the substrate is glass; the anode is ITO; the anode modification layer is PEDOT, PSS; the cathode modification layer is PFN-Br; the cathode is Ag.
The innovation point of the invention is that a ternary strategy is adopted, namely a mixture of two non-fullerene receptors BO-4Cl and BTP-S2 is used for replacing the traditional non-fullerene receptor BO-4Cl, so that the following advantages are brought: 1. because the receptor BTP-S2 and the donor PM6 have poor compatibility, even under the condition that the same solvent and a simple spin coating process are adopted to deposit the donor film and the receptor film in sequence, the mutual diffusion between the upper and the lower donor/receptor films is limited, so that the active layer has an ideal P-i-N morphological structure, namely, a donor rich phase (P) is formed at the interface of the anode modification layer, an receptor rich phase (N) is formed at the interface of the cathode modification layer, and the middle is a body heterojunction thick film (i) in which the donor and the receptor are well mixed and uniformly distributed. Therefore, the charge recombination of the obtained ternary organic solar cell is greatly inhibited, and the high-efficiency generation and collection of photocurrent are realized. 2. The introduction of the second acceptor BTP-S2 optimizes the energy level structure of the active layer and improves the crystallinity of the material, thereby improving the photovoltage of the battery and further improving the charge collection efficiency. Due to the advantages, the ternary organic solar cell (PM6/BO-4Cl: BTP-S2) prepared by the invention achieves the highest energy conversion efficiency (PCE is 18.50%) of the organic solar cell so far, is obviously superior to the binary organic solar cell (PM6/BO-4Cl, 16.66%) prepared by a corresponding step-by-step deposition method, and the ternary organic solar cell based on a bulk heterojunction structure (PM6: BO-4Cl: BTP-S2, 18.07%).
Drawings
Fig. 1 is an EQE spectrum of an organic solar cell of the LbL method preparation and conventional BHJ type.
Fig. 2 current-voltage curve of BHJ type organic solar cell under light irradiation. The thickness of the active layer of the cell was about 115nm, 1, 8-Diiodooctane (DIO) was added at 0.25% by volume of the active layer solution during the preparation, and the total weight ratio of PM6 to the non-fullerene acceptor mixture (BO-4Cl and BTP-S2) in the active layer was 1:1.2, wherein the ratio of BTP-S2 in the non-fullerene acceptor mixture was varied from 0% to 100%, and was annealed at 100 ℃ for 10 min.
Fig. 3 is a current-voltage curve of the LbL type organic solar cell under illumination. The thickness of the active layer of the cell is about 115nm, 1, 8-Diiodooctane (DIO) accounting for 0.25% of the volume of the solution is added into the acceptor mixture during preparation, PM6 in the active layer is firstly coated into a film by spin coating, the acceptor mixture is then coated into a film by spin coating, wherein the proportion of BTP-S2 in the non-fullerene acceptor mixture is changed from 0% to 100%, and the cell is subjected to annealing treatment at 100 ℃ for 10 min.
Detailed Description
Example 1
Sequentially carrying out ultrasonic oscillation cleaning on transparent conductive glass with strip-shaped ITO (anode) etched on the surface by using a cleaning agent, deionized water, acetone and isopropanol, drying, and then carrying out ultraviolet ozone treatment for 15 minutes; PSS was then spin-coated onto the conductive glass surface at 4500rpm with a 20nm thick layer of PEDOT, then 1 rpmAnnealing at 70 ℃ for 20 minutes, followed by transferring the sheet into a glove box. Preparing the BHJ type organic solar cell: a mixed solution of 1, 8-Diiodooctane (DIO) in an amount of 0.25% by volume and PM6: BO-4Cl (weight ratio: 1:1.2) in chloroform at a total concentration of 17.6mg/mL was added thereto, and spin-coated at 3500rpm for 30 seconds to obtain an active layer having a thickness of 115 nm. The active layer was annealed at 100 ℃ for 10 min. Then, a PFN-Br modified layer with the thickness of 5nm is spin-coated on the active layer by using a PFN-Br methanol solution with the concentration of 0.5 mg/mL. Finally, a 100nm thick Ag electrode (cathode) was evaporated using an evaporator to obtain an effective area of 4mm2The organic solar cell of (1).
The illumination intensity is 100mW/cm2The AM1.5 of (1) is used for testing the current-voltage curve of the device under the irradiation of simulated sunlight, and the open-circuit voltage is 0.854V and the short-circuit current density is 26.64mA/cm2The fill factor is 73.43% and the PCE is 16.75%.
FIG. 1 shows that the device has a light intensity of 100mW/cm2AM1.5 of (a) simulates the external quantum efficiency curve under solar radiation.
FIG. 2 shows that the device has a light intensity of 100mW/cm2AM1.5 of (a) simulates the current-voltage curve under solar radiation.
Example 2
Sequentially carrying out ultrasonic oscillation cleaning on transparent conductive glass with strip-shaped ITO (anode) etched on the surface by using a cleaning agent, deionized water, acetone and isopropanol, drying, and then carrying out ultraviolet ozone treatment for 15 minutes; PSS was then spin-coated onto the conductive glass surface at 4500rpm with a 20nm thickness, followed by annealing at 170 ℃ for 20 minutes, followed by transfer of the sheet into a glove box. Preparing the BHJ type organic solar cell: a mixed solution of 1, 8-Diiodooctane (DIO) in an amount of 0.25% by volume, PM6: BO-4Cl: BTP-S2 (wherein the total weight ratio of the donor to the acceptor is 1:1.2, and the mass ratio of BTP-S2 in the acceptor is 15%) in chloroform was added thereto, and spin-coated at 3500rpm for 30 seconds to obtain an active layer having a thickness of 115 nm. The active layer was annealed at 100 ℃ for 10 min. Then, a PFN-Br modification layer with the thickness of 5nm is spin-coated on the active layer by using a PFN-Br methanol solution with the concentration of 0.5mg/mL. Finally, a 100nm thick Ag electrode (cathode) was evaporated using an evaporator to obtain an effective area of 4mm2The organic solar cell of (1).
The illumination intensity is 100mW/cm2The AM1.5 of (1) is used for testing the current-voltage curve of the device under the irradiation of simulated sunlight, and the open-circuit voltage is 0.870V, and the short-circuit current density is 26.93mA/cm2The fill factor is 75.33%, and the PCE is 17.71%.
Example 3
Sequentially carrying out ultrasonic oscillation cleaning on transparent conductive glass with strip-shaped ITO (anode) etched on the surface by using a cleaning agent, deionized water, acetone and isopropanol, drying, and then carrying out ultraviolet ozone treatment for 15 minutes; PSS was then spin-coated onto the conductive glass surface at 4500rpm with a 20nm thickness, followed by annealing at 170 ℃ for 20 minutes, followed by transfer of the sheet into a glove box. Preparing the BHJ type organic solar cell: a mixed solution of 0.25% 1, 8-Diiodooctane (DIO), 17.6mg/mL PM6: BO-4Cl: BTP-S2 (wherein the total weight ratio of the donor to the acceptor is 1:1.2, and the mass ratio of BTP-S2 in the acceptor is 25%) in chloroform was spin-coated at 3500rpm for 30 seconds to obtain an active layer having a thickness of 115 nm. The active layer was annealed at 100 ℃ for 10 min. Then, a PFN-Br modified layer with the thickness of 5nm is spin-coated on the active layer by using a PFN-Br methanol solution with the concentration of 0.5 mg/mL. Finally, a 100nm thick Ag electrode (cathode) was evaporated using an evaporator to obtain an effective area of 4mm2The organic solar cell of (1).
The illumination intensity is 100mW/cm2The AM1.5 of (1) is used for testing the current-voltage curve of the device under the irradiation of simulated sunlight, and the open-circuit voltage is 0.886V, and the short-circuit current density is 26.86mA/cm2The fill factor is 75.98%, and the PCE is 18.07%.
FIG. 1 shows that the device has a light intensity of 100mW/cm2AM1.5 of (a) simulates the external quantum efficiency curve under solar radiation.
FIG. 2 shows that the device has a light intensity of 100mW/cm2AM1.5 of (a) simulates the current-voltage curve under solar radiation.
Example 4
Sequentially carrying out ultrasonic oscillation cleaning on transparent conductive glass with strip-shaped ITO (anode) etched on the surface by using a cleaning agent, deionized water, acetone and isopropanol, drying, and then carrying out ultraviolet ozone treatment for 15 minutes; PSS was then spin-coated onto the conductive glass surface at 4500rpm with a 20nm thickness, followed by annealing at 170 ℃ for 20 minutes, followed by transfer of the sheet into a glove box. Preparing the BHJ type organic solar cell: a mixed solution of 1, 8-Diiodooctane (DIO) in an amount of 0.25% by volume, PM6: BO-4Cl: BTP-S2 (wherein the total weight ratio of the donor to the acceptor is 1:1.2, and the mass ratio of BTP-S2 in the acceptor is 35%) in chloroform was added thereto, and spin-coated at 3500rpm for 30 seconds to obtain an active layer having a thickness of 115 nm. The active layer was annealed at 100 ℃ for 10 min. Then, a PFN-Br modified layer with the thickness of 5nm is spin-coated on the active layer by using a PFN-Br methanol solution with the concentration of 0.5 mg/mL. Finally, a 100nm thick Ag electrode (cathode) was evaporated using an evaporator to obtain an effective area of 4mm2The organic solar cell of (1).
The illumination intensity is 100mW/cm2The AM1.5 of (1) is used for testing the current-voltage curve of the device under the irradiation of simulated sunlight, and the open-circuit voltage is 0.890V and the short-circuit current density is 26.86mA/cm2The fill factor is 74.79% and the PCE is 17.81%.
Example 5
Sequentially carrying out ultrasonic oscillation cleaning on transparent conductive glass with strip-shaped ITO (anode) etched on the surface by using a cleaning agent, deionized water, acetone and isopropanol, drying, and then carrying out ultraviolet ozone treatment for 15 minutes; PSS was then spin-coated onto the conductive glass surface at 4500rpm with a 20nm thickness, followed by annealing at 170 ℃ for 20 minutes, followed by transfer of the sheet into a glove box. Preparing the BHJ type organic solar cell: a mixed solution of 1, 8-Diiodooctane (DIO) in an amount of 0.25% by volume, PM6: BO-4Cl: BTP-S2 (wherein the total weight ratio of the donor to the acceptor is 1:1.2, and the mass ratio of BTP-S2 in the acceptor is 50%) in chloroform was added thereto, and spin-coated at 3500rpm for 30 seconds to obtain an active layer having a thickness of 115 nm. The active layer was annealed at 100 ℃ for 10 min. Then on the active layer, withA PFN-Br methanol solution of 0.5mg/mL is spin-coated with a PFN-Br modification layer of 5nm thickness. Finally, a 100nm thick Ag electrode (cathode) was evaporated using an evaporator to obtain an effective area of 4mm2The organic solar cell of (1).
The illumination intensity is 100mW/cm2The AM1.5 of (1) is used for testing the current-voltage curve of the device under the irradiation of simulated sunlight, and the open-circuit voltage is 0.897V and the short-circuit current density is 26.13mA/cm2The fill factor is 74.12%, and the PCE is 17.32%.
Example 6
Sequentially carrying out ultrasonic oscillation cleaning on transparent conductive glass with strip-shaped ITO (anode) etched on the surface by using a cleaning agent, deionized water, acetone and isopropanol, drying, and then carrying out ultraviolet ozone treatment for 15 minutes; PSS was then spin-coated onto the conductive glass surface at 4500rpm with a 20nm thickness, followed by annealing at 170 ℃ for 20 minutes, followed by transfer of the sheet into a glove box. Preparing the BHJ type organic solar cell: adding 0.25% by volume of 1, 8-Diiodooctane (DIO), 17.6mg/mL of PM6: a mixed solution of BTP-S2 (weight ratio: 1.2) in chloroform was spin-coated at 3500rpm for 30 seconds to obtain an active layer 115nm thick. The active layer was annealed at 100 ℃ for 10 min. Then, a PFN-Br modified layer with the thickness of 5nm is spin-coated on the active layer by using a PFN-Br methanol solution with the concentration of 0.5 mg/mL. Finally, a 100nm thick Ag electrode (cathode) was evaporated using an evaporator to obtain an effective area of 4mm2The organic solar cell of (1).
The illumination intensity is 100mW/cm2The AM1.5 of (1) is used for testing the current-voltage curve of the device under the irradiation of simulated sunlight, and the open-circuit voltage is 0.950V and the short-circuit current density is 22.00mA/cm2The fill factor is 70.35% and the PCE is 14.74%.
FIG. 1 shows that the device has a light intensity of 100mW/cm2AM1.5 of (a) simulates the external quantum efficiency curve under solar radiation.
FIG. 2 shows that the device has a light intensity of 100mW/cm2AM1.5 of (a) simulates the current-voltage curve under solar radiation.
Example 7
Sequentially carrying out ultrasonic oscillation cleaning on transparent conductive glass with strip-shaped ITO (anode) etched on the surface by using a cleaning agent, deionized water, acetone and isopropanol, drying, and then carrying out ultraviolet ozone treatment for 15 minutes; PSS was then spin-coated onto the conductive glass surface at 4500rpm with a 20nm thickness, followed by annealing at 170 ℃ for 20 minutes, followed by transfer of the sheet into a glove box. Preparation of LbL type organic solar cell: a solution of PM6 at a concentration of 8mg/mL in chloroform was spin coated at 2000rpm for 30 seconds to give a 60nm thick donor layer. Next, a solution of BO-4Cl in chloroform, to which 0.25% by volume of 1, 8-Diiodooctane (DIO) was added and which had a concentration of 8mg/mL, was spin-coated at 2000rpm for 30 seconds to obtain an active layer having a total thickness of 115 nm. The active layer was annealed at 100 ℃ for 10 min. Then, a PFN-Br modified layer with the thickness of 5nm is spin-coated on the active layer by using a PFN-Br methanol solution with the concentration of 0.5 mg/mL. Finally, a 100nm thick Ag electrode (cathode) was evaporated using an evaporator to obtain an effective area of 4mm2The organic solar cell of (1).
The illumination intensity is 100mW/cm2The AM1.5 of (1) is used for testing the current-voltage curve of the device under the irradiation of simulated sunlight, and the open-circuit voltage is 0.854V and the short-circuit current density is 26.68mA/cm2The fill factor is 75.85%, and the PCE is 17.28%.
FIG. 1 shows that the device has a light intensity of 100mW/cm2AM1.5 of (a) simulates the external quantum efficiency curve under solar radiation.
FIG. 3 shows that the device has a light intensity of 100mW/cm2AM1.5 of (a) simulates the current-voltage curve under solar radiation.
Example 8
Sequentially carrying out ultrasonic oscillation cleaning on transparent conductive glass with strip-shaped ITO (anode) etched on the surface by using a cleaning agent, deionized water, acetone and isopropanol, drying, and then carrying out ultraviolet ozone treatment for 15 minutes; PSS was then spin-coated onto the conductive glass surface at 4500rpm with a 20nm thickness, followed by annealing at 170 ℃ for 20 minutes, followed by transfer of the sheet into a glove box. Preparation of LbL type organic solar cell: to a concentration ofA solution of 8mg/mL PM6 in chloroform was spin coated for 30 seconds at 2000rpm to give a 60nm thick donor layer. Then, 1, 8-Diiodooctane (DIO) was added in an amount of 0.25% by volume, and BO-4Cl was added at a total concentration of 8 mg/mL: a solution of BTP-S2 (wherein BTP-S2 was 15% by mass) in chloroform was spin-coated at 2000rpm for 30 seconds to obtain an active layer having a total thickness of 115 nm. The active layer was annealed at 100 ℃ for 10 min. Then, a PFN-Br modified layer with the thickness of 5nm is spin-coated on the active layer by using a PFN-Br methanol solution with the concentration of 0.5 mg/mL. Finally, a 100nm thick Ag electrode (cathode) was evaporated using an evaporator to obtain an effective area of 4mm2The organic solar cell of (1).
The illumination intensity is 100mW/cm2The AM1.5 of (1) is used for testing the current-voltage curve of the device under the irradiation of simulated sunlight, and the open-circuit voltage is 0.869V and the short-circuit current density is 27.03mA/cm2The fill factor is 76.58%, and the PCE is 18.00%.
Example 9
Sequentially carrying out ultrasonic oscillation cleaning on transparent conductive glass with strip-shaped ITO (anode) etched on the surface by using a cleaning agent, deionized water, acetone and isopropanol, drying, and then carrying out ultraviolet ozone treatment for 15 minutes; PSS was then spin-coated onto the conductive glass surface at 4500rpm with a 20nm thickness, followed by annealing at 170 ℃ for 20 minutes, followed by transfer of the sheet into a glove box. Preparation of LbL type organic solar cell: a solution of PM6 at a concentration of 8mg/mL in chloroform was spin coated at 2000rpm for 30 seconds to give a 60nm thick donor layer. Then, 1, 8-Diiodooctane (DIO) was added in an amount of 0.25% by volume, and BO-4Cl was added at a total concentration of 8 mg/mL: a solution of BTP-S2 (wherein BTP-S2 was 25% by mass) in chloroform was spin-coated at 2000rpm for 30 seconds to obtain an active layer having a total thickness of 115 nm. The active layer was annealed at 100 ℃ for 10 min. Then, a PFN-Br modified layer with the thickness of 5nm is spin-coated on the active layer by using a PFN-Br methanol solution with the concentration of 0.5 mg/mL. Finally, a 100nm thick Ag electrode (cathode) was evaporated using an evaporator to obtain an effective area of 4mm2The organic solar cell of (1).
The illumination intensity is 100mW/cm2The AM1.5 of (1) is used for testing the current-voltage curve of the device under the irradiation of simulated sunlight, and the open-circuit voltage is 0.886V, and the short-circuit current density is 27.15mA/cm2The fill factor is 77.21% and the PCE is 18.50%.
FIG. 1 shows that the device has a light intensity of 100mW/cm2AM1.5 of (a) simulates the external quantum efficiency curve under solar radiation.
FIG. 3 shows that the device has a light intensity of 100mW/cm2AM1.5 of (a) simulates the current-voltage curve under solar radiation.
Example 10
Sequentially carrying out ultrasonic oscillation cleaning on transparent conductive glass with strip-shaped ITO (anode) etched on the surface by using a cleaning agent, deionized water, acetone and isopropanol, drying, and then carrying out ultraviolet ozone treatment for 15 minutes; PSS was then spin-coated onto the conductive glass surface at 4500rpm with a 20nm thickness, followed by annealing at 170 ℃ for 20 minutes, followed by transfer of the sheet into a glove box. Preparation of LbL type organic solar cell: a solution of PM6 at a concentration of 8mg/mL in chloroform was spin coated at 2000rpm for 30 seconds to give a 60nm thick donor layer. Then, 1, 8-Diiodooctane (DIO) was added in an amount of 0.25% by volume, and BO-4Cl was added at a total concentration of 8 mg/mL: a solution of BTP-S2 (35% of BTP-S2 by mass) in chloroform was spin-coated at 2000rpm for 30 seconds to obtain an active layer having a total thickness of 115 nm. The active layer was annealed at 100 ℃ for 10 min. Then, a PFN-Br modified layer with the thickness of 5nm is spin-coated on the active layer by using a PFN-Br methanol solution with the concentration of 0.5 mg/mL. Finally, a 100nm thick Ag electrode (cathode) was evaporated using an evaporator to obtain an effective area of 4mm2The organic solar cell of (1).
The illumination intensity is 100mW/cm2The AM1.5 of (1) is used for testing the current-voltage curve of the device under the irradiation of simulated sunlight, and the open-circuit voltage is 0.886V, and the short-circuit current density is 26.60mA/cm2The fill factor is 76.64% and the PCE is 17.99%.
Example 11
Sequentially removing the transparent conductive glass with strip ITO (anode) etched on the surface by using a cleaning agentWashing the seed water, acetone and isopropanol by ultrasonic oscillation, drying, and treating with ultraviolet ozone for 15 minutes; PSS was then spin-coated onto the conductive glass surface at 4500rpm with a 20nm thickness, followed by annealing at 170 ℃ for 20 minutes, followed by transfer of the sheet into a glove box. Preparation of LbL type organic solar cell: a solution of PM6 at a concentration of 8mg/mL in chloroform was spin coated at 2000rpm for 30 seconds to give a 60nm thick donor layer. Then, 1, 8-Diiodooctane (DIO) was added in an amount of 0.25% by volume, and BO-4Cl was added at a total concentration of 8 mg/mL: a solution of BTP-S2 (wherein BTP-S2 was 50% by mass) in chloroform was spin-coated at 2000rpm for 30 seconds to obtain an active layer having a total thickness of 115 nm. The active layer was annealed at 100 ℃ for 10 min. Then, a PFN-Br modified layer with the thickness of 5nm is spin-coated on the active layer by using a PFN-Br methanol solution with the concentration of 0.5 mg/mL. Finally, a 100nm thick Ag electrode (cathode) was evaporated using an evaporator to obtain an effective area of 4mm2The organic solar cell of (1).
The illumination intensity is 100mW/cm2The AM1.5 of (1) is used for testing the current-voltage curve of the device under the irradiation of simulated sunlight, and the open-circuit voltage is 0.899V and the short-circuit current density is 25.64mA/cm2The fill factor is 76.76% and the PCE is 17.63%.
Example 12
Sequentially carrying out ultrasonic oscillation cleaning on transparent conductive glass with strip-shaped ITO (anode) etched on the surface by using a cleaning agent, deionized water, acetone and isopropanol, drying, and then carrying out ultraviolet ozone treatment for 15 minutes; PSS was then spin-coated onto the conductive glass surface at 4500rpm with a 20nm thickness, followed by annealing at 170 ℃ for 20 minutes, followed by transfer of the sheet into a glove box. Preparation of LbL type organic solar cell: a solution of PM6 at a concentration of 8mg/mL in chloroform was spin coated at 2000rpm for 30 seconds to give a 60nm thick donor layer. Next, a solution of BTP-S2 in chloroform, to which 0.25% by volume of 1, 8-Diiodooctane (DIO) was added and which had a concentration of 8mg/mL, was spin-coated at 2000rpm for 30 seconds to obtain an active layer having a total thickness of 115 nm. The active layer was annealed at 100 ℃ for 10 min. Then, on the active layer, PFN-Br A of 0.5mg/mL is usedAnd (3) coating a PFN-Br modification layer with the thickness of 5nm on the alcohol solution in a spinning mode. Finally, a 100nm thick Ag electrode (cathode) was evaporated using an evaporator to obtain an effective area of 4mm2The organic solar cell of (1).
The illumination intensity is 100mW/cm2The AM1.5 of (2) was tested for a current-voltage curve of the device under simulated solar radiation, from which an open-circuit voltage of 0.956V and a short-circuit current density of 22.68mA/cm were obtained2The fill factor is 71.29%, and the PCE is 15.51%.
FIG. 1 shows that the device has a light intensity of 100mW/cm2AM1.5 of (a) simulates the external quantum efficiency curve under solar radiation.
FIG. 3 shows that the device has a light intensity of 100mW/cm2AM1.5 of (a) simulates the current-voltage curve under solar radiation.
Claims (6)
1. The efficient ternary organic solar cell is prepared by a step-by-step deposition method and comprises a substrate, an anode modification layer, an active layer, a cathode modification layer and a cathode from bottom to top.
2. The efficient ternary organic solar cell prepared based on the step-by-step deposition method as claimed in claim 1, wherein the electron donor is a wide-bandgap polymer donor PM6, the electron acceptor composite is formed by mixing two non-fullerene acceptors BO-4Cl with BTP-S2, and the chemical structural formulas of the polymer donor and the non-fullerene acceptor are as follows:
3. the efficient ternary organic solar cell prepared by the step-by-step deposition method according to claim 2, wherein the electron donor film is formed by spin coating of a PM6 solution with a concentration of 6-10mg/mL, the electron acceptor composite film is formed by spin coating of a non-fullerene acceptor BO-4Cl and BTP-S2 mixture solution with a total concentration of 6-10mg/mL, and the total thickness of the active layer is 50-200 nm.
4. The efficient ternary organic solar cell prepared by the step-by-step deposition method according to claim 1 or 3, wherein an additive is added during film formation, the additive is 1, 8-Diiodooctane (DIO), and the volume of the additive is 0.2-1% of the volume of the non-fullerene acceptor mixture solution.
5. The efficient ternary organic solar cell prepared based on the step-by-step deposition method according to claim 1, wherein the active layer is annealed at 80-200 ℃ for 5-60 min.
6. The efficient ternary organic solar cell prepared based on the step-by-step deposition method according to claim 1, wherein the efficient ternary organic solar cell is prepared by the following steps: the substrate is glass; the anode is ITO; the anode modification layer is PEDOT, PSS; the cathode modification layer is PFN-Br; the cathode is Ag.
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| CN112467036A (en) * | 2020-11-25 | 2021-03-09 | 中国科学院大学 | Organic solar cell and preparation method for protecting environment-friendly solvent thereof |
| CN113629193A (en) * | 2021-07-28 | 2021-11-09 | 电子科技大学 | Organic solar cell with sandwich-configuration active layer and preparation method thereof |
| CN113880862A (en) * | 2021-09-09 | 2022-01-04 | 苏州大学 | Non-fullerene receptor with cooperative assembly characteristic and preparation method and application thereof |
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| CN110690349A (en) * | 2019-10-09 | 2020-01-14 | 浙江大学 | Efficient ternary organic solar cell based on non-fullerene acceptor alloy |
| CN111261786A (en) * | 2020-01-19 | 2020-06-09 | 浙江大学 | Efficient organic solar cell based on asymmetric end-capped electron acceptor |
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| CN111261786A (en) * | 2020-01-19 | 2020-06-09 | 浙江大学 | Efficient organic solar cell based on asymmetric end-capped electron acceptor |
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| CN112467036A (en) * | 2020-11-25 | 2021-03-09 | 中国科学院大学 | Organic solar cell and preparation method for protecting environment-friendly solvent thereof |
| CN112467036B (en) * | 2020-11-25 | 2024-04-05 | 中国科学院大学 | Organic solar cell and preparation method of environment-friendly solvent protection of organic solar cell |
| CN113629193A (en) * | 2021-07-28 | 2021-11-09 | 电子科技大学 | Organic solar cell with sandwich-configuration active layer and preparation method thereof |
| CN113880862A (en) * | 2021-09-09 | 2022-01-04 | 苏州大学 | Non-fullerene receptor with cooperative assembly characteristic and preparation method and application thereof |
| CN117295347A (en) * | 2023-11-27 | 2023-12-26 | 天津伏通科技有限公司 | Flexible organic photoelectric sensor, detector and wearable full-flexible heart rate oximeter |
| CN117295347B (en) * | 2023-11-27 | 2024-01-26 | 天津伏通科技有限公司 | Flexible organic photoelectric sensor, detector and wearable full-flexible heart rate oximeter |
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