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Efficient organic solar cells based on a new a??Y-seriesa?? non-fullerene acceptor with an asymmetric electron-deficient-core
摘要： Herein, a new “Y-series” non-fullerene acceptor, Y21, bearing an asymmetric electron-deficient-core (DA’D) and fluorinated dicyanomethylene derivatives as flanking groups, was designed and synthesized for organic solar cell applications. Rather than being perfectly C2 symmetric manner of the traditional “Y-series” acceptor, Y21 possesses an electron-withdrawing unit (A’) shifted from the center of DA’D, turning into an asymmetric molecular geometry. Photovoltaic devices based on PM6:Y21 can realize a high Jsc of 24.9 mA cm-2, and a PCE of 15.4 %. Our work demonstrates a new way to tune the photoelectronic property of the “Y-series” NFAs.
关键词： non-fullerene acceptor,Y-series,asymmetric electron-deficient-core,organic solar cells,photovoltaic performance
更新于2025-09-19 17:13:59
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Panchromatic organic photodetectors with SubPc as a non-fullerene acceptor
摘要： Panchromatic organic photodetectors are demonstrated with a lead phthalocyanine (PbPc)/boron subphthalocyanine (SubPc) planar heterojunction, where PbPc and SubPc acted as the donor and non-fullerene acceptor, respectively. Primary absorption bands of PbPc locate in ultraviolet (UV) and near-infrared (NIR) regions, while it is visible region for SubPc. As a result, the optimized device shows a wide response covered the wavelengths from UV to NIR with an external quantum ef?ciency of 10.9% at about 590 nm, which is attributed to the simultaneous dissociation of the photogenerated excitons in both PbPc and SubPc. Besides, the device also exhibits a detectivity higher than 1010 Jones in the wavelength ranged from 350 to 950 nm.
关键词： panchromatic photodetector,near-infrared,non-fullerene acceptor
更新于2025-09-19 17:13:59
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ITC‐2Cl: a Versatile Middle‐Bandgap Nonfullerene Acceptor for High‐Efficiency Panchromatic Ternary Organic Solar Cells
摘要： An effective way to improve the power conversion efficiency of organic solar cells (OSCs) is to use the ternary architecture consisting of a donor, an acceptor, and a third component. Identifying the proper third component for successful ternary OSCs, however, is not an easy task. Here, we demonstrate that a middle-bandgap acceptor, ITC-2Cl, functions as a successful third component for several wide-bandgap donor: ultra-narrow bandgap acceptor binary systems (PBDB-T-2F: F8IC, PBDB-T-2F: IOIC-2Cl, PBDB-T-2Cl: IOIC-2Cl). Photovoltaic parameters, including VOC, JSC, FF, and PCE, are effectively improved by incorporating ITC-2Cl, which lies in the complementary absorption of ITC-2Cl and host binary system, high-lying LUMO level of ITC-2Cl, and the inhibition of bimolecular recombination. The ternary device based on PBDB-T-2Cl: ITC-2Cl: IOIC-2Cl achieves a champion PCE of 14.75% (certified as 13.78%) with a very low energy loss of 0.48 eV. These results provide critical insight into the ternary strategy and encourage re-evaluation and re-study of the photoactive materials previously reported with moderate performance.
关键词： ternary organic solar cells,non-fullerene acceptor,panchromatic,energy loss
更新于2025-09-19 17:13:59
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Achieving Organic Solar Cells with efficiency over 14% based on a non-Fullerene Acceptor incorporating the Cyclopentathiophene unit Fused backbone
摘要： The cyclopentadithiophene (CPT) unit is a classic building block for constructing organic semiconductor materials with excellent performances. In this work, we designed and synthesized a new acceptor BCPT-4F, incorporating a CPT fused central backbone. BCPT-4F shows a redshift absorption in near-infrared region compared with CPT based acceptors with unfused backbone. Importantly, the photovoltaic device based on PBDB-T:BCPT-4F gave a promising power conversion efficiency (PCE) of 12.43% with a high short circuit current density of 22.96 mA cm?2. Furtherly,based on the above binary device, the ternary device with F-Br as the third component achieved a high PCE of 14.23%, which is presently the highest efficiency for devices with CPT based photovoltaic materials.
关键词： power conversion efficiency,non-fullerene acceptor,ternary device,cyclopentadithiophene,organic photovoltaics
更新于2025-09-19 17:13:59
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Non-fullerene acceptor fibrils enable efficient ternary organic solar cells with 16.6% efficiency
摘要： Optimizing the components and morphology within the photoactive layer of organic solar cells (OSCs) can significantly enhance their power conversion efficiency (PCE). A new A-D-A type non-fullerene acceptor IDMIC-4F is designed and synthesized in this work, and is employed as the third component to prepare high performance ternary solar cells. IDMIC-4F can form fibrils after solution casting, and the presence of this fibrillar structure in the PBDB-T-2F:BTP-4F host confines the growth of donors and acceptors into fine domains, as well as acting as transport channels to enhance electron mobility. Single junction ternary devices incorporating 10 wt% IDMIC-4F exhibit enhanced light absorption and balanced carrier mobility, and achieve a maximum PCE of 16.6% compared to 15.7% for the binary device, which is a remarkable efficiency for OSCs reported in literature. This non-fullerene acceptor fibril network strategy is a promising method to improve the photovoltaic performance of ternary OSCs.
关键词： ternary solar cells,non-fullerene acceptor fibrils,power conversion efficiency
更新于2025-09-19 17:13:59
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Tuning opto-electronic properties of alkoxy-induced based electron acceptors in infrared region for high performance organic solar cells
摘要： Limitations of fullerene-based acceptors for organic solar cell have driven the scientific community to design and synthesize non-fullerene acceptors. In this regard, we have designed four new molecules designated here S1-S4 containing Alkoxy-Induced Naphtho-dithiophene donor unit and 2-(5,6-difluoro-2-methylene-3-xo-2,3-dihydrinden-1-ylidene)malonoitrile acceptor moiety attached with different bridge units. The electronic and optical properties of the designed molecules S1-S4 are compared with the recently reported reference molecule R. The bridge units are, thiophene (S1), 2-fluorothiophene (S2), 2-(thiophe-2-yl)thiophene (S3) and 2-(4-fluorothiophen-2-yl)thiophene (S4). The designed molecule S3 shows absorption maximum in near infra-red (NIR) region at 830.0 nm and 910.6 nm in gas phase and chloroform solvent, respectively. The energy gaps of designed molecules are lower than that of the reference R, which reveal high charge transfer for the designed molecules. Among all, S3 has the lowest energy gap (1.68 eV). Open circuit voltages (Voc) calculation are performed with well-known PTB7-Th donor. Voc of all the molecules are higher than R where the maximum Voc of 1.92V is calculated for S2. Low reorganization energies of our designed molecule reflect high charge transfer rate with respect to R. Among all designed molecules, S3 has the highest electron mobility.
关键词： Alkoxy induced,Reorganization energy,Transition density matrix,Non-fullerene acceptor,Thiophene,Charge Transfer,Open circuit voltages
更新于2025-09-19 17:13:59
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5H-Fluoreno [3,2- b:6,7- b’] Dithiophene Based Non-fullerene Small Molecular Acceptors for Polymer Solar Cell Application
摘要： Two novel non-fullerene small molecule acceptors were prepared with the conjugated backbone of 5H- fluoreno[3, 2- b:6, 7- b’] dithiophene carrying the electron deficient unit of dicyanomethylene indanone (DICTFDT) and rhodanine (TFDTBR), respectively. The two acceptors exhibited excellent thermal stability and strong absorption in the visible region. The LUMO level is estimated to be at -3.89 eV for DICTFDT and -3.77 eV for TFDTBR. When utilized as the acceptor in bulk heterojunction polymer solar cells with the polymer donor of PBT7-Th, the optimized maximum power conversion efficiency of 5.12% and 3.95% was obtained for the device with DICTFDT and TFDTBR, respectively. The research demonstrates that 5H- fluoreno[3, 2- b:6, 7- b’] dithiophene can be an appealing candidate for constructing small molecular electron acceptor towards efficient polymer:non-fullerene bulk heterojunction solar cells.
关键词： polymer solar cells,non-fullerene acceptor,bulk heterojunction
更新于2025-09-16 10:30:52
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Synthesis and photovoltaic investigation of 8,10-bis (2-octyldodecyl) -8,10-dihydro-9H-bisthieno [2 ', 3': 7.8; 3``, 2 '': 5.6] naphtho [2,3-d] imidazol-9-one based conjugated polymers using non-fullerene acceptor
摘要： Two donor -acceptor (D-A) conjugated polymers designed on same 8,10-bis (2-octyldodecyl)-8,10-dihydro-9H-bisthieno [2`,3`:7,8; 3”,2”:5,6]naphtho [2,3-d]imidazole-9-one donor and dissimilar acceptor units, i.e. benzothiadiazole BT (P104) and fluorinated benzothiadiazole (P105) were synthesized and investigated their photophysical and electrochemical properties. The influence of the incorporation of fluorine atoms into the benzothiadiazole (BT) acceptor moiety in the polymer backbone on the photovoltaic performance when combined with the low bandgap non-fullerene acceptor ITIC-F was explored. The polymer solar cells based on P105:ITIC-F exhibited higher PCE (10.65 %) as compared to P104 :ITIC-F (8.32 %), resulted from the improved values of all the photovoltaic parameters. High value of Voc is linked with the deeper highest occupied molecular orbital energy level of P105 and the larger values of both short circuit current and fill factor are endorsed to the efficient exciton separation into charge carriers and their subsequent transfer owing to the increased value of dielectric constant and reduced value of exciton dissociation and energy loss and promoted balanced charge transportation. The intra/interchain interaction can be modulated by F atom substitution in the BT unit, resulting reduction in π-π stacking distance and increase in the crystal coherence length, benefiting the charge transportation in the active layer. These results offer a simple effective approach to regulate the optical and electrochemical properties and therefore increase the overall photovoltaic response.
关键词： D-A conjugated copolymer,non-fullerene acceptor,Polymer solar cells,morphology
更新于2025-09-12 10:27:22
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Quinoidal Oligothiophenes Having Full Benzene Annelation: Synthesis, Properties, Structures, and Acceptor Application in Organic Photovoltaics
摘要： To achieve a complete closed-shell quinoidal state, bis(dicyanomethylene)-substituted quinoidal terthiophenes bearing benzene annelation at all thiophene rings were synthesized using a retro-Diels?Alder reaction as the key step. The unique structures and properties originating from the full benzene annelation were revealed by X-ray analysis as well as property measurements. Organic solar cells based on the combination of a donor polymer with a quinoidal terthiophene as an acceptor showed a power conversion e?ciency of 1.39%.
关键词： organic photovoltaics,retro-Diels?Alder reaction,non-fullerene acceptor,quinoidal oligothiophenes,benzene annelation
更新于2025-09-12 10:27:22
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High Open‐Circuit Voltage Organic Photovoltaics Fabricated Using an Alkylidene Fluorene Derivative as a Non‐fullerene Acceptor
摘要： Alkylidene ?uorene-based molecular acceptors, AF-T-INCN and AF-T8-INCN, are synthesized for use in non-fullerene organic photovoltaics. Both AF-T-INCN and AF-T8-INCN exhibited absorption region from 400 to 700 nm in their neat ?lm states. Highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels were found to be ?5.79/?3.80 eV for AF-T-INCN and ? 5.82/?3.79 eV for AT-T8-INCN, respectively. The organic solar cell devices fabricated with AF-T-INCN exhibited relatively low device performances with an open-circuit voltage (VOC) of 0.25 V, a short-circuit current density (JSC) 0.47 mA/cm2, a ?ll factor (FF) 29%, and power conversion ef?ciency (PCE) 0.03%, because of its strong aggregation in the blending condition. In contrast, AF-T8-INCN exhibited increased solubility and improved device performances with a high VOC of 1.24 V, a JSC 2.18 mA/cm2, a FF 28%, and PCE 0.76%.
关键词： Organic photovoltaic cells,Non-fullerene acceptor,Alkylidene ?uorene
更新于2025-09-12 10:27:22