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Improving Photovoltaic Performance by Using Perovskite/Surface Modified Graphitic Carbon Nitride Heterojunction
摘要： Passivation strategies were considered as one of the most efficient methods to suppress non-radiative recombination of organic-inorganic lead halide perovskite solar cells (PSCs), then, as well as, were widely employed as passivation agents, according to the previous reports. Anchoring g-leading to tremendous photovoltaic performance. An innovative 2D polymer, graphitic carbon nitride (g-C3N4), as well as various organic groups (amino, sulfonic, nitrato and hydroxy group) leading to tremendous photovoltaic performance. C3N4 and the aforementioned organic groups as additives in perovskite could both heal charged defects around the grain boundaries by passivating the charge recombination center. Besides, the crystalline quality could also be enhanced by the incorporation of g-C3N4, leading to improved conductivity of perovskite light absorber films that is beneficial for benign charge extraction efficiency. Inspiring of the underlining mechanisms, we designed a series of novel passivation molecules, functionalized g-C3N4 (F-C3N4) with assorted organic groups, yielding to champion power conversion efficiency (PCE) of 20.08% for NO3-C3N4 based p-i-n structure PSC, in comparison with that of PSC without passivation (17.85%). These findings presented an efficient strategy to understand and design multiple facets of applications of novel passivation molecules to further improve the PCE of PSCs.
关键词： passivation,graphitic carbon nitride,perovskite solar cells,organic groups,photovoltaic performance
更新于2025-09-11 14:15:04
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Designing High Performance Nonfullerene Electron Acceptors with Rylene Imides for Efficient Organic Photovoltaics
摘要： Improving carrier mobility, redox stability, blend morphology, and photovoltaic performance while elucidating structure-property relationships remain important design goals for nonfullerene electron acceptors (NFAs) for organic solar cells. Although numerous NFAs have been created from rylene diimide electron-deficient building blocks, they have showed far inferior photovoltaic properties compared to benchmark fused-ring electron acceptors (FREAs) such as ITIC. Herein we show that new bis(naphthalene-imide)arylenelidenes (BNIAs), incorporating rylene-imide end-capping groups via methine bridges in donor-acceptor architectures, are endowed with enhanced electrochemical redox stability, high carrier mobilities, and high photovoltaic performance. Pairing of those BNIAs that are also FREAs, NIDT and NIBT, respectively with donor polymer PBDB-T produced 10.0-10.8% efficient photovoltaic devices, which are comparable to benchmark ITIC devices. Blends of FREAs NIDT and NIBT and those of non-FREA NITV were found to have similar electron mobility, demonstrating that the much higher photovoltaic efficiency of NIDT and NIBT devices does not originate from enhanced charge transport but from differences in blend morphology and blend photophysics. The results demonstrate that incorporating rylene imides into molecular architectures through methine-bridged donor-acceptor coupling motif is a promising design strategy towards more efficient and electrochemically rugged materials for organic solar cells.
关键词： organic photovoltaics,carrier mobility,redox stability,photovoltaic performance,nonfullerene electron acceptors,rylene imides
更新于2025-09-11 14:15:04
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Rational Design of Low Bandgap Polymers for Efficient Solar Cells with High Open-Circuit Voltage: The Profound Effect of Me and Cl Substituent with Similar Van Der Waals Radius
摘要： Generally, low bandgap materials-based photovoltaic devices have reduced open circuit voltage (VOC), and how to realize the trade-off between the low bandgap (Eg<1.6 eV) and high VOC (>0.9 V) could be critical to give efficient polymer solar cells, especially for high-performance semitransparent PSCs and tandem solar cells. Although lots of efforts have been made to address the issue, most results may be not gratifying. In this work, the polymer PTBTz-Cl based on the chlorination method and efficient thiazole-induced strategy was designed and synthesized, aiming at the deep HOMO energy level, and the enhanced backbone planarity caused by the weak noncovalent Cl···S interaction. In addition, the methyl-substituted polymer PTBTz-Me was constructed as the reference due to the similar van der Waals radius of side chain (CH3: 0.20 nm vs Cl: 0.18 nm). Encouragingly, in comparison with that of PTBTz-2, the newly synthesized polymers exhibit the red-shifted absorption spectra ranging from 300 to 770 nm, with obviously reduced Eg of ～1.6 eV. However, the function of Cl and Me substituent is different. Compared to the polymer PTBTz-Me, PTBTz-Cl exhibits a lower HOMO value, stronger crystallinity, and more compact intramolecular interactions. Consequently, the polymer PTBTz-Cl exhibits excellent photovoltaic performance with a notable VOC of 0.94 V and a PCE of 10.35%, which is ～11% higher than the 9.12% efficiency based on PTBTz-Me, and is also one of the highest values among polymer/fullerene solar cells. Moreover, a smaller photo energy loss (Eloss) of 0.64 eV is achieved, which is rare among the current high-performance polymer systems.
关键词： High open-circuit voltage,Low energy loss,Photovoltaic performance,Chlorination method,Polymer solar cell
更新于2025-09-11 14:15:04
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Enhanced photovoltaic performance of Y2O3:Ho3+/Yb3+ upconversion nanophosphor based DSSC and investigation of color tunability in Ho3+/Tm3+/Yb3+ tridoped Y2O3
摘要： The present study reports the upconversion (UC) based color tuning in Y2O3:Ho3+/Yb3+, Y2O3:Tm3+/Yb3+ and Y2O3:Tm3+/Ho3+/Yb3+ phosphors synthesized through complex based precursor solution method. The Y2O3:Ho3+/Yb3+ phosphor emits intense green and weak red colors whereas the Y2O3:Tm3+/Yb3+ emits NIR and blue colors on excitation with 976 nm. The impact of the enhancement in the concentration of Yb3+ on the color point of codoped as well as tridoped phosphors has been studied in detail. When Y2O3:Tm3+/Ho3+/Yb3+ phosphor is excited by 976 nm laser, the phosphor emits dominant green color. This is due to energy transfer from Tm3+ to Ho3+ ions. The increase in the concentration of Yb3+ ion leads to a color tunability not only in the co-doped but also in the tridoped phosphors. Furthermore, we have incorporated Y2O3:Ho3+,Yb3+ UC phosphor into TiO2 electrode to form an UC based DSSC for converting near IR (NIR) light into visible where DSSCs typically have high sensitivity. The short-circuit current density (Jsc) as well as the open-circuit voltage (Voc) of the UC-TiO2 based cell was found to be 8.46% and 5.18% higher which in turn, resulted into a 10.33% enhancement in power conversion efficiency as compared to that of bare TiO2 based DSSC. Thus, the UC based Y2O3:Ho3+/Yb3+ may be useful in color tunability and DSSC applications.
关键词： Upconversion,Photovoltaic performance,Color tuning,DSSC,Y2O3:Ho3+/Yb3+
更新于2025-09-11 14:15:04
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Enhancing the Performance of Textured Silicon Solar Cells by Combining Up-Conversion with Plasmonic Scattering
摘要： This paper experimentally demonstrates the bene?ts of combining an up-conversion (UC) layer containing Yb/Er-doped yttrium oxide-based phosphors with a plasmonic scattering layer containing indium nanoparticles (In-NPs) in enhancing the photovoltaic performance of textured silicon solar cells. The optical emissions of the Yb/Er-doped phosphors were characterized using photoluminescence measurements obtained at room temperature. Optical microscope images and photo current-voltage curves were used to characterize the UC emissions of Yb/Er-doped phosphors under illumination from a laser diode with a wavelength of 1550 nm. The plasmonic e?ects of In NPs were assessed in terms of absorbance and Raman scattering. The performance of the textured solar cells was evaluated in terms of optical re?ectance, external quantum e?ciency, and photovoltaic performance. The analysis was performed on cells with and without a UC layer containing Yb/Er-doped yttrium oxide-based phosphors of various concentrations. The analysis was also performed on cells with a UC layer in conjunction with a plasmonic scattering layer. The absolute conversion e?ciency of the textured silicon solar cell with a combination of up-conversion and plasmonic-scattering layers (15.43%) exceeded that of the cell with an up-conversion layer only (14.94%) and that of the reference cell (14.45%).
关键词： plasmonic scattering,up-conversion,indium nanoparticles,phosphors,photovoltaic performance,yttrium oxide
更新于2025-09-11 14:15:04
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Introducing Four 1,1-Dicyanomethylene-3-Indanone (IC) End-capped Groups as an Alternative Strategy for the Design of Small Molecular Nonfullerene Acceptors
摘要： Linear A-D-A or A-π-D-π-A architectures are predominant in the design of promising non-fullerene acceptors (NFAs), which promoted the rapid progress of organic solar cells (OSCs). However, utilization of four electron-accepting units (A) to construct four-armed NFAs is rarely reported and the relationship of structure-properties-performance is unclear. In this study, we designed and synthesized a novel acceptor (A401) with (AA)-π-D-π-(AA) configuration, where four 1,1-dicyanomethylene-3-indanone (IC) groups were used as the end-capped segments. When A401 was paired with a classic p-type polymer PBDB-T, a power conversion efficiency (PCE) of 7.54% could be achieved, which was much higher than that of the reported two-armed analogue of DC-IDT2T (3.93%). The improved photovoltaic performance of A401 should be ascribed to the high electron-affinity. Our results indicate introducing more end-capped electron-accepting units is a simple and effective alternative strategy for the design of promising NFAs. Our conceptualized molecular architecture will encourage further research of high-performance multi-armed NFAs.
关键词： photovoltaic performance,electron-affinity,electron-accepting units,organic solar cells,non-fullerene acceptors
更新于2025-09-10 09:29:36
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Angle dependence of synthesized BiOI prepared by dip coating and its effect on the photovoltaic performance
摘要： A study about the angle effect on the synthesis of BiOI films via modified successive ionic layer adsorption and reaction (SILAR) and its application as p-type semiconductor in solar cell construction have been carried out. By involving the angle inclination on the BiOI synthesis process in this work, it showed the impact on the BiOI film thickness. We found the thicker films contained larger flaky morphology which was displayed by the FESEM image. Also, it exhibited an increase of the Bi-I internal stretching mode (Eg) in the Raman spectra, BiOI peak absorbance in the visible region, and its crystal intensity in the XRD pattern along with the decreasing angle from 90° to 50° while SILAR process was running. Although our BiOI films performed better Jsc compared to previous studies, their photovoltaic parameters decreased slightly upon the reducing angle, which induced larger BiOI growth in the larger flaky cluster.
关键词： angle dependence,dip coating,photovoltaic performance,BiOI,SILAR
更新于2025-09-04 15:30:14