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Higha??Performance Nonfullerene Organic Solar Cells with Unusual Inverted Structure
摘要： A new fused-ring electron acceptor FOIC1 was designed and synthesized. FOIC1 exhibits intense absorption in the range of 600-1000 nm, HOMO/LUMO energy levels of –5.39/–3.99 eV, and electron mobility of 1.8 × 10–3 cm2 V–1 s–1. Organic solar cells based on sequentially processed heterojunction (SHJ) with unusual inverted structure were fabricated. Through sequentially spin-coating polymer donor PTB7-Th as the bottom layer and acceptor FOIC1 as the top layer, a better vertical phase distribution is formed in this SHJ compared with that in traditional bulk heterojunction (BHJ). In the upper-half part, a more balanced donor/acceptor distribution is beneficial for exciton dissociation. At the bottom interface, more FOIC1 accumulation is beneficial for exciton generation and charge transport. Overall, the SHJ cells exhibit power conversion efficiency as high as 12.0%, higher than that of the BHJ counterpart (11.0%).
关键词： sequential processing,inverted structure,nonfullerene,fused-ring electron acceptor,organic solar cell
更新于2025-09-23 15:21:01
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Designing alkoxy-induced based high performance near infrared sensitive small molecule acceptors for organic solar cells
摘要： Scientist are dedicated to design and synthesize efficient photovoltaic materials to overcome the energy crises. In this regard, herein, we have designed four new small acceptor molecules namely (A1, A2, A3 and A4) for better performance in organic solar cells. These molecules consist Alkoxy-Induced Naphtho-dithiophene core unit flanked with 2,2-ethylidene-5,6-dicyano-3-oxo-2,3-dihydroinden-1-ylidene-malononitrile (A1), methyl-2-cyano-2,2-ethylidene-5,6-difluoro-3-oxo-2,3-dihydroinden-1-ylidene-acetate (A2), 5,2-ethylidene-5,6-difluoro-3-oxo-2,3-dihydroinden-1-ylidene-3-methyl-2-thioxothiazolidin-4-one (A3) and 2,5-ethylidene-6-oxo-5,6-dihydrocyclopenta-thiophen-4-ylidene-malononitrile (A4) end-capped acceptor groups. Their optical, electrical and geometries have been compared with reported molecule R. Frontier molecular orbital diagram reveal excellent charge transfer rate, The electron density is shifted from donor to acceptor unit. Among all, A1 exhibits the highest absorption in the visible region (λmax) at 798 nm in chloroform solvent. The maximum open circuit voltage (2.08 V) is observed for A3 when blended with PTB7-Th donor polymer. All studied molecules have high charge mobilities due to lower reorganization energy values with respect to model molecule R. A1 has the highest electron mobility among all molecules due to lower value of reorganization energy which is 0.0034. Furthermore, all designed molecules show good Solubilities in organic solvent. A2 exhibit high value of dipole moment which reveal good solubilities in fabrication process.
关键词： Transition density matrix,Non-fullerene acceptor,Open circuit voltages,Naphtho-dithiophene,Reorganization energy,Fused ring electron acceptor
更新于2025-09-19 17:13:59
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An Alkoxya??Solubilizing Decacyclic Electron Acceptor for Efficient Ecoa??Friendly Asa??Cast Bladea??Coated Organic Solar Cells
摘要： The rapid development of organic solar cells (OSCs) based on non-fullerene acceptors has achieved significant breakthroughs in power conversion efficiency (PCE) of spin coated devices. However, spin coating method in a protective atmosphere seems unsuitable for the practical scalable coating and eco-friendly manufacturing approaches are necessary to be developed for printing of high-performance solar panels. In addition, the use of highly toxic solvents is also a stumbling block to the commercial application of OSCs. Thus, the photoactive materials for scalable coating and eco-friendly scalable fabrication methods, and it is still a challenge that transition from the existing cutting-edge performance OSCs to eco-environment blade coated devices. Herein, a fused ring electron acceptor named as F10IC2 bearing a decacycle core and solubilizing alkoxyl side chains was synthesized and applied in as-cast blade coated OSCs by blending with polymer donor PTB7-Th. As-cast OSCs based on PTB7-Th: F10IC2 blended films fabricated from chlorobenzene (CB) or chlorine-free o-xylene (XY) solvents in air without any post-treatment, delivered a PCE of 12.5% and 11.4%, respectively, which are among the highest values reported for as-cast blade-coated OSCs. This study provides a strategy of alkoxyl solubilizing to design the high-performance material system for eco-friendly scalable OSCs, which is suitable for the future industrial production.
关键词： Eco-friendly,Blade-coating,Organic solar cell,Fused-ring electron acceptor
更新于2025-09-19 17:13:59
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Nonfullerene acceptors comprising a naphthalene core for high efficiency organic solar cells
摘要： A fused-ring electron acceptor (FREA) NDIC is designed and synthesized. Inspired by IDIC, NDIC was constructed by replacing the benzene with a naphthalene ring in its core unit. IDIC exhibits an optical bandgap of 1.60 eV and a lower lowest unoccupied molecular orbital (LUMO) energy level of ?3.92 eV. In comparison, NDIC displays an optical band gap of 1.72 eV and a higher lying LUMO energy level of ?3.88 eV. Due to the higher energy level, inverted devices based on NDIC exhibit a higher open circuit voltage (Voc) of 0.90 V, which is much higher than that of IDIC (0.77 V). After a series of optimizations, a power conversion efficiency (PCE) of 9.43% was obtained with a PBDB-T:NDIC blend active layer, in comparison, a PCE of 9.19% was achieved based on IDIC. Our results demonstrate that a tiny variation in the molecular structure could dramatically affect the optical and electrochemical properties, and thus the photovoltaic performance.
关键词： Nonfullerene acceptors,organic solar cells,fused-ring electron acceptor,photovoltaic performance,naphthalene core
更新于2025-09-12 10:27:22