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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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Comparative study of conventional and inverted P3HT: PCBM organic solar cell
摘要： This work is a comprehensive comparative study between conventional and inverted bulk hetero-junction (BHJ) Organic Solar Cell (OSC and IOSC) using GPVDM software. Contrary to conventional OSCs with a low work-function cathode located on the top, IOSC is characterized by a bottom transparent conductive oxide cathode. The calculated current-voltage characteristic (J-V) is used to extract the main electrical outputs (figures of merit) of the solar cell: the short circuit current (Jsc), the open circuit voltage (Voc), the fill factor (FF) and the efficiency (η). The effect of a number of physical parameters is studied including thickness of the different layers and materials used as electron (hole) transport layer, ETL (HTL). In addition, different top and bottom electrodes are suggested with mono and multi-thin layer. A comparison between the effect of all these factors in OSC and IOSC is also performed and it was found that IOSC using multi-thin layer ATZ (AZO/TiOx/ZnO) as bottom contact gives the best efficiency of 5.46% in comparison with 5.02% obtained for the conventional OSC with ZnO/TiOx/ZnO contact.
关键词： Organic solar cells,Inverted structure,Bulk hetero-junction,GPVDM Software,Multi-thin layer electrodes
更新于2025-09-23 15:19:57
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Efficient and Stable Inverted Perovskite Solar Cells Incorporating Secondary Amines
摘要： Large-bandgap perovskites offer a route to improve the efficiency of energy capture in photovoltaics when employed in the front cell of perovskite–silicon tandems. Implementing perovskites as the front cell requires an inverted (p–i–n) architecture; this architecture is particularly effective at harnessing high-energy photons and is compatible with ionic-dopant-free transport layers. Here, a power conversion efficiency of 21.6% is reported, the highest among inverted perovskite solar cells (PSCs). Only by introducing a secondary amine into the perovskite structure to form MA1?xDMAxPbI3 (MA is methylamine and DMA is dimethylamine) are defect density and carrier recombination suppressed to enable record performance. It is also found that the controlled inclusion of DMA increases the hydrophobicity and stability of films in ambient operating conditions: encapsulated devices maintain over 80% of their efficiency following 800 h of operation at the maximum power point, 30 times longer than reported in the best prior inverted PSCs. The unencapsulated devices show record operational stability in ambient air among PSCs.
关键词： defect density,perovskite solar cells,inverted structure,secondary amine,stability
更新于2025-09-19 17:13:59
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Dynamic casting in combination with ramped annealing process for implementation of inverted planar Ag3BiI6 rudorffite solar cells
摘要： The use of toxic Pb and insufficient long-term stability continue to limit the commercialization of organic–inorganic hybrid perovskite photovoltaics despite their excellent power conversion efficiencies (PCEs). Inorganic silver bismuth iodide is a strong candidate for a Pb-free and stable light harvester. Using a conventional n-i-p structure with high-temperature-processed TiO2 charge transport layer, PCEs of more than 4% have been achieved. However, development of inverted planar p-i-n architecture supporting low-temperature flexible application are still in its infant stage as the PCE of only 0.02% has been reported. To unravel such poor performance of the p-i-n structure, a Ag3BiI6 rudorffite film has been fabricated using a combination of dynamic casting (DC) and ramped annealing (RA). This technique significantly enhances the surface coverage of Ag3BiI6 on the underlying planar NiOx hole collector. Furthermore, the optimal annealing temperature of 180 °C allows for the formation of a highly polycrystalline and dense absorber. Based on this approach, the unprecedented PCE of 1.08% has been achieved, whereas the conventional method gives the PCE of only 0.07%. The DC/RA method could offer a new perspective for developing Pb-free inorganic rudorffite photovoltaics with an inverted planar architecture.
关键词： Ramped annealing,Inverted structure,Rudorffite,Silver bismuth iodide,Solar cells,Dynamic casting
更新于2025-09-19 17:13:59
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24.3: <i>Invited Paper:</i> Printed Electrodes for All‐Solution‐Processed Inverted‐Structure OLEDs
摘要： A key enabling technology for all-printed organic light-emitting diodes is printing electrodes that can be used for anodes or cathodes for conventional or inverted device structures. In both device structures, the first bottom electrodes, which are either transparent or opaque depending on the device structure, are typically printed while the last top electrodes have been deposited by using a vacuum-based evaporation process because when the last top electrodes are fabricated by using a solution-based process, under organic layers are easily damaged during the fabrication process. Although so-called transfer printing process has been often reported for organic devices such as organic solar cells, it has been rarely applied for OLEDs. In addition, no fine patterning has been adopted in such printing processes. As part of our efforts towards all-printed OLEDs, inkjet-printed and/or transfer-printed, finely-patterned PEDOT:PSS electrodes have been investigated in our lab and most recent achievement will be reported in detail. In order to implement all-solution-processed OLEDs, we also studied the inverted-structure OLEDs, which showed comparable results to the conventional structure OLEDs with the vacuum-based deposited electrodes.
关键词： inverted structure,Organic light-emitting diode,OLED,PLED,inkjet-printing,transfer-printing,polymer light-emitting diode
更新于2025-09-19 17:13:59
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All-solution Processed High Performance Inverted Quantum Dot Light Emitting Diodes
摘要： All-solution processed colloidal quantum dot light emitting diodes (QLEDs) with record performance have been successfully realized by introducing dually-doped poly(ethylenedioxythiophene)/polystyrenesulfonate (PEDOT:PSS) hole-injection layer and polyethylenimine (PEI) interfacial layer. Doping PEDOT:PSS with both Zonyl and isopropanol (IPA) significantly improves the wettability of PEDOT:PSS, making coating hydrophilic PEDOT:PSS onto hydrophobic hole-transporting layer poly(9-vinlycarbazole) (PVK) possible. The PEI interlayer between PVK/QD layer not only lowers down the vacuum level, thereby reducing the hole-injection barrier to balance the charge carriers, but also passivates QD surface defects via its amine group to suppress fluorescence quenching. As a result, the peak current efficiency of 28.1 cd/A, 43.1 cd/A, and 1.26 cd/A, the maximum external quantum efficiency (EQE) of 20.6%, 10.4%, and 2.95%, and the maximum luminance of 5.06 × 104 cd/m2, 1.21 × 105 cd/m2, and 2.96 × 103 cd/m2, have been achieved for red, green, and blue QLEDs, respectively. To the best of our knowledge, the red device’s EQE is one of the highest among all inverted red QLEDs. In addition, the extrapolated lifetime of the red QLEDs sets a new record by reaching 8253 h at an initial brightness of 100 cd/m2.
关键词： PEDOT:PSS,inverted structure,QLEDs,all-solution processed,quantum dot light emitting diodes,PEI
更新于2025-09-19 17:13:59
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Investigation of InGaAs subcell to InGaP subcell in InGaP/InGaAs/Ge multijunction solar cells with Analytical framework
摘要： Solar radiation consists of different electromagnetic spectrum. Single junction solar cell restricts complete absorption of incident radiations. This limits the efficiency of the solar cells. The way to overcome this calamity is to segregate and classify the entire spectrum into several spectral tiny regions according respective band gaps inherently. This process gives birth to multi-junction solar cell. This paper describes the mathematical model for multi-junction metamorphic inverted solar cell. Starting from their primitive need, present work includes the photovoltaic effect to electroluminescence extinction. MATLAB simulation has been used to demonstrate the photo-voltage and electroluminescence intensity. It is observed from the obtained results that generated photo-voltage increases with the illumination power while the electroluminescence intensity decreases.
关键词： Analytical solution of multi-junction cell,Single-walled nanotube solar cell,Metamorphic inverted solar cell characteristics,Inverted structure,Multi-junction solar cell
更新于2025-09-16 10:30:52
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Electrical Conduction and Luminescence for Inverted-Type Organic Light-Emitting Diodes with Polyethyleneimine
摘要： Organic light-emitting diodes (OLEDs) have showed the unique potentials of display by bendable, foldable and storable panels. In general, since OLEDs consisted of multi organic layers, their electrical conduction would be complicated. Aluminum quinoline (Alq3) was a classical and famous fluorescent material. We studied the conduction properties of inverted Alq3-bilayer OLEDs. Since the barrier height of electron injection from ITO cathode to Alq3 was higher than that from LiF/Al, electrons were little injected into Alq3 and the current density in the absence of EL was controlled by holes. In the specimen using polyethyleneimine as an injection layer, the current density and hole injection were influenced by electron injection for the current continuity. Despite that holes could arrive at the counter cathode through Alq3, the recombination zone was located near a hole transport layer as the conventional bilayer OLED. It was suggested that the carrier transport in an organic layer depends on both carrier injections.
关键词： Polyethyleneimine,Organic light-emitting diode,Inverted structure,Carrier injection
更新于2025-09-16 10:30:52
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All-solution processed inverted QLEDs with double hole transport layers and thermal activated delay fluorescent dopant as energy transfer medium
摘要： Highly efficient, all-solution processed inverted quantum dot light-emitting diodes (QLEDs) with high performance are demonstrated by employing poly(9-vinlycarbazole) (PVK) as additional hole transport layer (HTL) and doping it with a blue thermal activated delay fluorescent (TADF) material, 4,5-bis(carbazol-9-yl)-1,2-dicyanobenzene (2CzPN). This PVK: 2CzPN composite layer not only optimizes hole injection, but also utilizes the leaked electrons to enhance device luminance by energy transfer process from 2CzPN to quantum dots (QDs). These benefits enable a 20-fold increment for the device current efficiency (from 0.523 cd/A to 11 cd/A) and a 9.9-fold improvement for the maximum luminance (from 3220 cd/m2 to 35352 cd/m2), compared with those of the standard QLED with poly[(9, 9-dioctylfluorenyl-2,7-diyl)-alt-(4,4'-(N-(4-butylphenyl) (TFB) single HTL. In comparison with the QLED with TFB/pristine PVK double HTLs, the device performance of the optimal QLED with PVK: 2CzPN additional HTL are still 40.8% and 61.7% higher in luminance and current efficiency, respectively.
关键词： Thermally activated delayed fluorescence,Quantum dot light-emitting diode,All-solution process,Energy transfer,Double hole transport layers,Inverted structure
更新于2025-09-12 10:27:22
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Optimization of a precursor-PbI2 layer by re-crystallization for efficiency improvement in perovskite solar cells
摘要： Due to good light absorption capability, ease of production process and high potential of large area fabrication, perovskite solar cells receive a wide attention around the scientific community. Factors affecting the efficiency of perovskite solar cells include moisture, perovskite solution purity, completeness of perovskite layer and perovskite crystal grain size. In this work, the investigation of crystallization process of PbI2 as precursor for methyl ammonium lead triodide (CH3NH3PbI3) photo-absorber layer has been carried out. The inverted structure of FTO/PEDOT: PSS/CH3NH3PbI3/PCBM/Ag perovskite devices is fabricated using the two-step spin-coating method. The pre-heated PbI2 solution is left at room temperature to re-crystallize at various crystallization time (0-60 h). It was discovered that the perovskite solar cell using 48 h of crystallization time provides the highest power conversion efficiency of 9.69%. Morphology and crystallinity of perovskite layer will be discussed in relation to photovoltaic properties.
关键词： re-crystallization,perovskite solar cells,two-step spin - coating method,inverted structure
更新于2025-09-12 10:27:22