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Terrylene Diimide-Based Middle-Low Bandgap Electron Acceptors for Organic Photovoltaics
摘要： Rylene diimides have evolved as the most investigated compounds among polycyclic aromatic hydrocarbons, due to their excellent absorption, fluorescence and outstanding electron-withdrawing ability. In this work, we present two A-D-A type electron acceptors based on terrylene diimide and investigate the impact of intramolecular nonbonding conformational locks on the molecular geometry, the solid packing arrangement as well as the photovoltaic performance. Detailed investigation demonstrates that the introduction of fluoride atoms facilitates the noncovalent interactions with sulfur elements on adjacent thiophene groups and therefore, more balanced charge transfer as well as suppressed bimolecular recombination prompt the JSC and FF, endowing the solar cells based on fluoride-substituted acceptor with a higher PCE up to 5.29%.
关键词： intramolecular nonbonding conformational locks,electron acceptors,photovoltaic performance,organic photovoltaics,Terrylene diimide
更新于2025-09-23 15:19:57
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Photovoltaic properties of planar organic solar cells using perylenetetracarboxylic diimide with phenylethyl derivatives
摘要： We report the performances of planar organic photovoltaics (OPVs) using a low bandgap polymer (PTB7) as a donor (D) and three perylenetetracarboxylic diimide derivatives with different substituents on the nitrogen atoms, phenylethyl (PEPTC), (4-fluorophenyl)ethyl (4FPEPTC), and (4-methoxyphenyl)ethyl (4MeOPEPTC) as acceptors (A). These acceptors with different dipolar moments at the end group are expected to exhibit different interactions with the underlying PTB7 layer. An anomalous low open-circuit voltage (Voc) in the OPV with PTB7/4FPEPTC was obtained due to the orientation of dipolar moments at the D/A interfaces induced by the orientation of 4FPEPTC with 4-fluorophenyl groups. On the other hand, although the terminal 4-methoxyphenyl group in 4MeOPEPTC has a dipole moment in the opposite direction to the terminal 4-fluorophenyl group in 4FPEPTC, the expected large Voc was not obtained in the OPV with PTB7/4MeOPEPTC due to the disorientation of 4MeOPEPTC at the D/A interface.
关键词： open-circuit voltage,dipolar moments,perylenetetracarboxylic diimide,organic photovoltaics,phenylethyl derivatives
更新于2025-09-23 15:19:57
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Experimentally Calibrated Kinetic Monte Carlo Model Reproduces Organic Solar Cell Currenta??Voltage Curve
摘要： Kinetic Monte Carlo simulations are used to describe the current-voltage characteristics of an organic bulk heterojunction solar cell. Excellent agreement between model and experiment is obtained by calibrating the injection barriers, the blend morphology and the charge transfer recombination rate with data from independent measurement techniques.
关键词： organic photovoltaics,charge recombination,Kinetic Monte Carlo simulations,morphology,charge injection
更新于2025-09-23 15:19:57
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Bis (tri-alkylsilyl oxide) silicon phthalocyanines: understanding the role of solubility on device performance as ternary additives in organic photovoltaics
摘要： The use of ternary additives in organic photovoltaics (OPV) is a promising route to improve overall device performance. Silicon phthalocyanines (SiPcs) are ideal candidates due to their absorption profile, low cost and ease of synthesis and chemical tunability. However, to date only a few examples have been reported and specific strategies to help design improved ternary additives have not been established. In this study, we report a relationship between ternary additive solubility and device performance, demonstrating that device performance is maximized when the SiPc additive solubility is similar to that of the donor polymer (P3HT, in this case). This improved performance can be attributed to the favored interfacial precipitation of the SiPcs when its solubility matches that of the other components of the thin film. The power conversion efficiency (PCE) varied from 2.4% to 3.4% by using axially substituted SiPcs with different solubilities, where the best ternary additive led to a 25% increase in PCE compared to the baseline device.
关键词： organic photovoltaics,solubility,ternary additive,phthalocyanine
更新于2025-09-23 15:19:57
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Determining the sequence and backbone structure of a??semi-statisticala?? copolymers as donora??acceptor polymers in organic solar cells
摘要： Organic photovoltaics (OPVs) are attracting significant attention due to the growing demand for economically viable and renewable energy sources. With efficiencies exceeding 16.5%, single junction bulk heterojunction (BHJ) devices are amongst the most promising and are nearing commercialisation. One recent avenue of research has focused on statistical conjugated copolymers. However, a detailed investigation as to why these materials can achieve higher power conversion efficiencies than their regular alternating counterparts is seldom reported. This work describes an investigation into donor–acceptor polymers demonstrating how differing monomer activities can lead to differing microstructures in a simple batch reaction, which in turn demonstrates promising optoelectronic and morphological properties required for organic photovoltaic devices. A one pot condensation polymerisation reaction with three monomers leads to an ABA triblock structure from differing monomer reactivities. This structure in turn leads to visualised phase separation which is possibly linked to an increase in performance. Further to this we report on the reliability of the Stille coupling for the synthesis of conjugated polymers.
关键词： Organic photovoltaics,Donor–acceptor polymers,Bulk heterojunction devices,Statistical conjugated copolymers,Stille coupling
更新于2025-09-23 15:19:57
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Recent Progress in Indoor Organic Photovoltaics
摘要： Among various potential applications of organic photovoltaics (OPVs), indoor power generation has great potential because of several advantages over outdoor light harvesting under 1 sun condition. Commonly used indoor light sources have narrower emission spectra with lower intensity (by 3 orders of magnitude) as compared to the solar spectrum. Highly tunable optical absorption, large absorption coefficient, and small leakage currents under dim lighting conditions make OPVs promising candidates for indoor applications. For optimizing indoor photovoltaic materials and devices, several key issues (different from those under 1 sun condition), such as developing new indoor photovoltaic materials and devices with suitable absorption spectrum, large open-circuit voltage with low energy loss, minimized trap-mediated charge recombination and leakage currents, and device stability under indoor conditions, should be considered carefully. In this review, recent progresses in optimization of indoor photovoltaic materials and devices, and the key strategies to optimize the indoor photovoltaic characteristics will be summarized and discussed.
关键词： device optimization,light harvesting,organic photovoltaics,indoor power generation,photovoltaic materials
更新于2025-09-23 15:19:57
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Semitransparent Energya??Storing Functional Photovoltaics Monolithically Integrated with Electrochromic Supercapacitors
摘要： Energy-storing functional photovoltaics, which can simultaneously harvest and store solar energy, are proposed as promising next-generation multifunction energy systems. For the extension of conventional organic photovoltaics (OPVs), electrochromic supercapacitors (ECSs) are monolithically integrated with semitransparent (ST) quaternary blend-based OPVs (ST Q-OPVs) to achieve compact, energy-efficient storage with great aesthetic appeal. In particular, ST Q-OPVs with low-power-consumption ECSs allow full operation, even under low-intensity irradiance, including artificial indoor light circumstances, and thereby exhibit potential for all-day operating energy suppliers. The prepared ST energy-storing functional photovoltaics also serve as a backup power source for external electronic equipment (e.g., light-emitting diodes, and sensor nodes for Internet of Things) by consuming charged power. In addition to features that include unrestricted operation under any circumstances, color tunability, feasibility of designs with various shapes, rapid charging/discharging, and real-time indication of stored energy levels, ST energy-storing functional photovoltaics could potentially be applied in electronic devices such as advanced smart windows or portable smart electronics.
关键词： semitransparent organic photovoltaics,electrochromic supercapacitors,energy-storing functional photovoltaics,monolithic integration
更新于2025-09-19 17:13:59
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Recent Progress on Indoor Organic Photovoltaics: From Molecular Design to Production Scale
摘要： Recently, indoor photovoltaics have attracted much interest for their ability to power small electronic devices and sensors, especially with the growth of the Internet of Things (IoT). Due to their absorption covering ambient emission spectra and tunable electronic structures, π-conjugated polymers and small molecules are well-suited for these applications. Among many benefits, including their ink processability, lightweight and flexibility; indoor organic photovoltaics (IOPVs) show power conversion efficiencies (PCE) over 26%. It represents a power output over 30 μW cm-2 under office light (500 lux), which is sufficient to operate many electronic devices and sensors with a relatively small photovoltaic area. This focus review highlights the major advances in the material design for IOPVs and includes some industrial insights to reach the production scale criteria.
关键词： indoor photovoltaics,material design,power conversion efficiencies,organic photovoltaics,Internet of Things
更新于2025-09-19 17:13:59
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Facile synthesis of a semiconducting bithiophene-azine polymer and its application for organic thin film transistors and organic photovoltaics
摘要： A new azine polymer poly(4,40-didodecyl-2,20-bithiophene-azine) (PDDBTA) was synthesized in only three steps. PDDBTA showed hole mobilities of up to 4.1 (cid:2) 10(cid:3)2 cm2 V(cid:3)1 s(cid:3)1 in organic thin ?lm transistors (OTFTs) as a p-channel material. As a donor in organic photovoltaics (OPVs), power conversion e?ciencies (PCEs) of up to 2.18% were achieved, which is the ?rst example of using an azine-based polymer for OPVs. These preliminary results demonstrate the potential of bithiophene-azine polymers as a new type of low-cost semiconductor material for OPVs and other organic electronics.
关键词： azine polymer,semiconductor material,organic photovoltaics,organic thin film transistors
更新于2025-09-19 17:13:59
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Ultra-Thick Organic Pigment Layer Up to 10 ??m Activated by Crystallization in Organic Photovoltaic Cells
摘要： Organic optoelectronic devices tend to have limited thickness. Organic light emitting diodes (OLED) and organic photovoltaic cells (OPV) made of organic pigments are typically with thickness of a few or a few tens of nanometers. Thickness of organic photovoltaic cells made with polymers exceeds them typically up to the order of a few 100 nm but still necessarily co-optimized with respect to light absorption and charge transport. Here, we demonstrate that crystallization made a 10-μm-thick pigment layer active in a photovoltaic cell, using a prototypical pair of pigments, phthalocyanine, and fullerene. It is proved that crystalline pigment layer with a thickness much greater than what is needed for optical optimization can be utilized for organic optoelectronic devices and that organic optoelectronic devices have potentiality to relief their design from co-optimization of optics and charge transport.
关键词： bulk hetero-junction,organic electronics,crystallization,organic photovoltaics,pigment,solar cell
更新于2025-09-19 17:13:59