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Citrus fruit peels extracts as light harvesters for efficient ZnO-based dye-sensitized solar cells
摘要： Our voracious consumption of fossil fuels at an exponentially increasing rate has led to global warming and climate change. As a result of these problems, it is crucial to explore other sources of clean energy. The natural pigments extraction and performance determination in Dye-Sensitized Solar Cells (DSSCs) from fruit peels of citrus were presented in this paper. Extraction of natural dye of citrus fruit peels of Citrus paradisi, Citrus sinensis, Citrus limonum and Citrus tangelo were employed as light sensitizers in fabricating ZnO-based DSSCs. The natural pigments extracts characteristics were analyzed by UV-Vis absorption, Fourier transforms infra-red (FTIR) and Photoluminescence spectroscopy techniques. The semiconductor active layer material was synthesized and analyzed. The characteristics of photo-voltaic parameters for the invented DSSCs were studied under simulated sunlight. The presence of chlorophyll derivative in most of the extracted dyes is evident as the core pigments with additional accessory pigments. The conversion efficiencies of sunlight to electrical energy of pheophytin 'a' dye ZnO based solar cells are calculated to be 0.028%, 0.013%, 0.004% and 0.022% for Citrus paradisi, Citrus sinensis, Citrus limonum and Citrus tangelo, respectively. Better performance of photo-sensitized was observed for the extracts of Citrus paradisi compared to the other extracts and this may be owing to the better charge transfer between the pigments of Citrus paradisi and surface of ZnO photoactive layer. The conversion of visible light to electricity was produced from natural pigments and ZnO photoactive layer based DSSCs, resulted into superb photo-electric characteristics.
关键词： chlorophyll derivative,Natural dye,citrus fruit peels,DSSC,conversion efficiency,photoactive layer
更新于2025-09-23 15:19:57
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10.34%-efficient integrated CsPbBr3/bulk-heterojunction solar cells
摘要： Inorganic cesium lead bromide (CsPbBr3) perovskite solar cells (PSCs) have superior moisture- and thermal-stability in comparison with organic-specie or/and I-containing devices. However, the narrow-spectra absorption (<550 nm) arising from their large bandgap of 2.3 eV for CsPbBr3 halide has markedly limited the further efficiency enhancement of corresponding inorganic device, therefore a great challenge is to broaden the light response range without sacrificing environmental tolerances. In this work, we constructively fabricate a CsPbBr3/bulk-heterojunction (organic J61-ITIC) photoactive layer to widen the optical absorption range of inorganic CsPbBr3 based interlayer-free device. Arising from the broadened light response wavelength from 550 to 780 nm and precisely optimized crystal lattice by incorporating Rb into CsPbBr3 film, the optimal device achieves a power conversion efficiency up to 10.34% under one sun illumination. Upon persistent attacks by heat of 80°C (0% humidity) or 90% humidity (25°C) over 40 days, the solar cell can still remain approximately 96% of initial efficiency, demonstrating the excellent stability for practical application.
关键词： Inorganic perovskite solar cell,Wide-spectral absorption,Cesium lead bromide,Photoactive layer,Improved stability
更新于2025-09-19 17:13:59
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Combined parametric optimization of P3HT: PC70BM films for efficient bulk-heterojunction solar cells
摘要： In this report, the effects of photoactive blend compositions, film thicknesses, and annealing conditions on the P3HT:PC70BM solar cells performance and reproducibility was investigated. The performance of prepared devices was described by examining their absorption spectra, current-voltage characteristics and external quantum efficiency (EQE). The thickness of active layer was achieved as 190 nm, 125 nm, and 90 nm, by maintaining the spin speed. Current density (Jsc) slightly increases from 6.39 to 7.15 mA/cm2 with increase in thickness from 90 to 125 nm; however, with further increase in film thickness (190 nm), the Jsc was reduced to 4.39 mA/cm2. To optimize the device performance, four different compositions of PC70BM (1:0.6, 1:0.8, 1:1, and 1:12) were investigated at the most favorable film thickness ~ 125 nm. The effect of different PC70BM compositions on photovoltaic performance was demonstrated by X-ray diffraction (XRD) and Raman measurements that illuminated modification in structural properties. Additionally, annealing condition led to achieve the good phase separation for efficient charge separation and transport within P3HT: PCBM film which further leads to increased efficiency (PCE ~ 3.31%). These effects deliver valued facts for the choices of PC70BM amount in P3HT:PC70BM system, and this efficient device optimization might be useful in other efficient photovoltaic systems for better performance through excellent reproducibility.
关键词： P3HT:PC70BM,Composition,Film thickness,Solar cells,Photoactive layer
更新于2025-09-12 10:27:22
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Optimizing Microstructure Morphology and Reducing Electronic Losses in 1-cm <sup>2</sup> Polymer Solar Cells to Achieve Efficiency over 15%
摘要： The successful demonstration of high-performance organic solar cells (OSCs) on relatively large-area is vital for their industrial viability and future application. When the device area is enlarged from several mm2 to the scale of >1 cm2, critical losses caused by film inhomogeneity or defects in the photoactive layer strongly restrict the performance and reproducibility of OSCs. In this work, we demonstrate that through delicate optimization of photoactive layer and minimization of optoelectronic losses, an impressive external quantum efficiency maximum up to 88% and an internal quantum efficiency peak of 97% are achieved for non-fullerene OSCs. Further incorporating fullerene as the third component into the photoactive layer optimizes the microstructure morphology, enabling the large-scale devices with an area of >1.1 cm2 surpassing the 15% efficiency milestone. The exciting results demonstrated in this work highlight the strategic priority to minimize losses through both materials and electronic engineering towards high-performance large-area OSCs.
关键词： large-area devices,photoactive layer,non-fullerene acceptors,organic solar cells,electronic losses,microstructure morphology
更新于2025-09-11 14:15:04