Study on the performance of ZMO/PbS quantum dot heterojunction solar cells
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Lead sulfide
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A robust solution phase ligand exchange system for lead sulfide (PbS) quantum dots (QDs) in the presence of Pb-thiolate ligands is presented that can better preserve the excitonic absorption and emission features as compared to the conventional ligands. The photoluminescence after ligand exchange of PbS QDs with Pb-thiolate ligand is preserved up to 78% of the original oleate capped PbS QDs.
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Organic solar cells (OSCs) are one of the common types of solar cells which shows a high interest in photovoltaic devices. In this research, the performance of two OSC which are using PET/PEDOT: PSS/P3HT: PCBM/Al (device A) and ITO/ Glass/PEDOT: PSS/P3HT: PCBM/Al (device B) have been evaluated under illumination of light intensity 1000 W/m 2 . The effect of different substrates on photovoltaic performance has been investigated. The active materials used in this structure are poly (3-hexylthiophene) (P3HT) as a donor and [6], [6]-phenyl-C60 butyric acid methyl ester (PCBM) as an acceptor. The materials have been mixed by a ratio of 1:1 P3HT and PCBM. To obtain homogeneous mixture, chlorobenzene and 1, 2 dichlorobenzene solvents are utilized. The results obtained in this study show a drastic increase in power conversion efficiency (PCE) of the device fabricated on ITO substrate (Device B). Whereas the device A (fabricated on PET substrate) exhibit much lower PCE. According to the results obtained here the maximum short circuit current density, open circuit voltage, fill factor and power conversion efficiency values of the device B are 4.723 mA/cm 2 , 0.712 V, 36.1% and 1.21 %, respectively.
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Colloidal quantum dots offer broad tuning of semiconductor band structure via the quantum size effect. In this paper, we present a detailed investigation on the influence of the thickness of colloidal lead sulfide (PbS) nanocrystals (active layer) to the photovoltaic performance of colloidal quantum dot solar cells. The PbS nanocrystals (QDs) were synthesized in a non-coordinating solvent, 1-octadecene, using oleic acid (OA) as the ligand. It was found that the device with 50 nm of thickness of active layer showed a high Efficiency (η) of 0.667 under simulated Air Mass 1.5 Global (AM 1.5G) irradiation (100 mW/cm2) compared to the device with low thickness of active layer.
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Pentacene
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In recent years, the advancement of solar cell technology is increased by leaps and bounds and it is also used to achieve a solution for the worldwide huge need for generation of energy and electricity. The colloidal quantum dot (CQD) offers a size-tuned bandgap and materials processing compatibility with a range of substrates. QDSC (Quantum dot solar cell) have advantages such as low cost, high efficiency, and replaces bulky material (Cadmium Selenide, Lead Selenide etc over traditional solar cell. “Despite these advantages, it lags due to carrier recombination in the Quasi-Neutral Region (QNR). The performance of the solar cell greatly depends on the electron transport layer (ETL) and hole transport layer (HTL). To investigate the feasibility of a highperformance device, a comparative investigation of the PbS-EDT and Spiro-OMeTAD hole transport layers has been done. For this, we have varied the various parameters upon which performance of solar cells is dependent in order to maximise the performance. All simulations study has been performed using SCAPS-1D simulator. The overall maximum optimized performance of the photovoltaic solar cell of 16.29% is obtained using TiO 2 and PbS-TBAI(tetrabutylammonium iodide) as a ETL and absorber layer respectively. Our research demonstrates that an efficient quantum dot solar cell could be fabricated experimentally using the optimal device structure.
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Abstract The phase separation degree of active layers plays a vital role in enhancing the power conversion efficiency of organic solar cells. Two post treatments were employed to optimize the phase separation degree of active layers by subtly adjusting the self‐assembly process for SMPV1:PC 71 BM based active layers (SMPV1, 2,6‐bis[2,5‐bis(3‐octylrhodanine)‐(3,3‐dioctyl‐2,2':5,2''‐terthiophene)]‐4,8‐bis((5‐ethylhexyl)thiophen‐2‐yl)benzo[1,2‐b:4,5‐b']dithiophene; PC 71 BM, [6,6]‐phenyl‐C 71 ‐butyric acid methyl ester). In this work, a power conversion efficiency of 7.93% was obtained for devices with an as‐cast active layer, which is close to the highest values reported for SMPV1 based devices. The power conversion efficiency was further increased to 8.64% or 8.99% for active layers with thermal annealing or thermal annealing together with solvent vapor annealing, respectively. The enhanced performance is mainly attributed to more efficient photon harvesting and charge transport induced by the post annealing treatment of the active layers. The face‐on molecular orientation of SMPV1 is increased for active layers with post annealing treatment, which is beneficial for charge transport along directions perpendicular to the substrate. This work further confirms the positive effect of post annealing treatment on the performance improvement of organic solar cells. © 2019 Society of Chemical Industry
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High-performance cascaded-junction quantum dot solar cells (CJQDSCs) are fabricated from as-prepared highly monodispersed lead sulfide QDs. The cells have a high power conversion of 9.05% and a short-circuit current density of 32.51 mA cm–2. A reliable and effective stratagem for fabricating high-quality lead sulfide quantum dots (QD) is explored through a "monomer" concentration-controlled experiment. Robust QDSC performances with different band gaps are demonstrated from the as-proposed synthesis and processing stratagems. Various potential CJQDSCs can be envisioned from the band edge evolution of the QDs as a function of size and ligands reported here.
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Multiple exciton generation
Hybrid solar cell
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