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Facile synthesis of Cr doped hierarchical ZnO nano-structures for enhanced photovoltaic performance
摘要： Transition metal doped ZnO has been widely used in various research areas such as optoelectronics, chemical sensors, solar cells and photo catalysts. Herein, we fabricated Cr-doped ZnO nanospheres by a facile solvothermal treatment for enhanced photovoltaic performance. A systematic study of the structural and optical properties of Cr doped ZnO were investigated by scanning electron microscopy (SEM), X-ray diffraction technique (XRD), Ultra violet-Visible spectroscopy (UV–Vis) respectively. XRD patterns confirm that the samples have hexagonal (wurtzite) structure with no additional peaks, which suggests that Cr ions replaces the regular Zn sites in the ZnO crystal structure. Furthermore, doped ZnO nanospheres were employed in the hybrid solar cells in combination with P3HT and gave better current densities than their corresponding undoped counterparts. The increase in solar cell efficiency of doped ZnO nanospheres is solely due to the improvement in the charge separation efficiency in the 4% Cr doped ZnO nanospheres. Optoelectronic analysis of the Cr doped ZnO hybrid solar cell showed comparable results of JSC ?3.7 (mAcm?2), VOC 0.44 (V), Fill Factor 0.49 and Efficiency (?) 0.79 (%). The enhanced photovoltaic activity of the Cr doped hierarchical ZnO nanostructures provides an interesting grounds for the design and enhancement of the low cost, feasible synthesis of photovoltaic nanostructure materials.
关键词： Hybrid solar cell,Solvothermal method,Optical absorption,Photovoltaic device,Nanostructure
更新于2025-09-23 15:21:01
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Above 800 mV Open-Circuit Voltage in Solid-State Photovoltaic Devices Using Phosphonium Cation-Based Solid Ionic Conductors
摘要： Here, we report phosphonium based two solid ionic conductors (SICs) named as triphenylphosphonium methyl iodide (TPPMeI) and triphenylphosphonium iodide (TPPHI) prepared via simple protocol at room temperature and were used as an electrolyte for solid state photovoltaic devices (ss-PVDs) showing the open circuit voltage (Voc) exceeding to 800 mV. Here, very first time, detailed electrochemical investigations with theoretical aspects of phosphonium electrolytes were taken into account, where PVDs prepared from these SICs, TPPMeI resulted into the highest power conversion efficiency (PCE) of 4.08 % with Voc of 810 mV. However, this performance was further enhanced up to the PCE of 6.71% with 824 mV of Voc in the presence of additives like LiI and tert-butyl pyridine. This work leads to find the best alternative of liquid and quaternary ammonium ion based electrolytes which suffers from problems like lower Voc (< 800 mV), stability, leakage etc.
关键词： Phosphonium cation based solid organic ionic conductors,Solid ionic conductors,Solid state photovoltaic device,Triphenylphosphonium cation,Organic Electrolytes
更新于2025-09-23 15:19:57
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Core-Double Shell Nano-hybrids Designed by Multi-walled Carbon Nanotubes, Polyaniline and Polythiophenes in PBDT-DTNT:PC61BM Solar Cells
摘要： Core–mantle–shell supramolecules composed of carbon nanotube (CNT)-graft-polyaniline (PANI), poly(3-hexylthiophene) (P3HT), and poly[benzodithiophene-bis(decyltetradecyl-thien) naphthothiadiazole] (PBDT-DTNT) precursors were designed and utilized in PBDT-DTNT:phenyl-C61-butyric acid methyl ester (PC61BM) solar cells. Weight ratio of polymer:CNT-graft-PANI was 9:1 and the weight ratios were 1:1 in binary and 1:1:1 in ternary systems. Diameters of core(CNT)–mantle(PANI), core(CNT)–mantle(PANI)–shell(P3HT), and core(CNT)–mantle(PANI)–shell(PBDT-DTNT) nanostructures ranged in 75–90 nm, 145–160 nm, and 120–130 nm, respectively. Efficacies of 6.82% (13.92 mA/cm2, 0.71 V, 69%, 7.1 9 10?3 cm2/V s and 1.9 9 10?2 cm2/V s) and 7.60% (14.66 mA/cm2, 0.73 V, 71%, 9.0 9 10?3 cm2/V s and 3.4 9 10?2 cm2/V s) were acquired for photovoltaics based on the nanostructures having PBDT-DTNT and P3HT shells, respectively. The PANI mantle may act as both acceptor (accepting the electrons from core) and donor (donating the electrons to shell) in the configuration of core–mantle–shell supramolecules. The P3HT shells acted better than the PBDT-DTNT ones, originated from the simple structure of P3HT backbones and their more ordered and thicker shells, and thus had larger charge mobilities and currents.
关键词： core–mantle–shell,photovoltaic device,PANI,PBDT-DTNT,P3HT
更新于2025-09-19 17:13:59
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Incorporation of coppera??indium back-end layers in the solution-based Cu(In, Ga)Se <sub/>2</sub> films: enhancement of photovoltaic performance of fabricated solar cells
摘要： The morphology and photovoltaic properties of the solution-based Cu(In, Ga)Se2 films are effectively improved via the incorporation of copper-indium back-end layers in the precursor films. The effects on the concentrations of bimetal-ions solutions to prepare copper-indium back-end layers are investigated in this study. The incorporation of copper-indium back-end layer in the precursor film enhances the internal diffusion between gallium-ions and indium-ions during selenization reaction. Hence, the porous structure in the back-contact region of prepared CIGS films becomes densified, and the bandgap distribution of films shows a gradient profile. The densified morphology and gradient bandgap reduce the carrier recombination and improve the carrier collection of solar cells. In contrast to the pristine precursor film, the precursor film with a copper-indium back-end layer increase the conversion efficiency of prepared solar cells from 8.34% to 11.13%. The enhancement of conversion efficiency is attributed to the improvement of short-circuit current density and fill factor from 25.70 mA cm?2 and 57.65% to 31.79 mA cm?2 and 65.70%, respectively. This study reveals that the photovoltaic properties of solution-based CIGS solar cells can be improved significantly via the incorporation of copper-indium back-end layers into the precursor films.
关键词： photovoltaic device,thin-film solar cells,non-vacuum process,CIGS
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE International Conference on Engineering Veracruz (ICEV) - Boca del Rio, Veracruz, Mexico (2019.10.14-2019.10.17)] 2019 IEEE International Conference on Engineering Veracruz (ICEV) - A review on quantum dot solar cells: properties, materials, synthesis and devices
摘要： Quantum dot semiconductors have gain great attraction for the development of high efficiency solar cells due to remarkable optoelectronic properties such as tunable bandgap, multiple exciton generation (MEG) and high extinction coefficient. Despite quantum dot solar cells having theoretical power conversion efficiency of about 66%, actual maximum efficiency is only 16.6%. So, it is important to further understand the relations between properties, elements composition, material structures and synthesis methods, as well as devices architectures in order to propose strategies addressed to close the gap between actual and theoretical power conversion efficiencies. This article exposes the advances related to materials and methods of synthesis, and their impact in quantum dot properties. It also introduces some recent quantum dot solar cells designs.
关键词： multiple exciton generation,quantum dots,photovoltaic device,solar cell
更新于2025-09-12 10:27:22
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Structural and optical study of CZTS-reduced graphene oxide composite towards photovoltaic device application
摘要： The deficit in obtaining targeted photo conversion efficiency for (Cu2ZnSnS4) CZTS based photovoltaic cell results either from insufficient photo charge carrier generation or e-/h+ pair transportation towards the end of electrodes, which lowers the device Voc and Jsc. On this regard, semiconducting absorber material merged with highly mobile reduced graphene oxide (rGO) as filler form a bridging network within active layer facilitates both improvement in charge carrier separation as well as transportation to electrodes before recombination occurs. A simple solution casting approach for CZTS nanoparticle anchored rGO composite for photovoltaic device application is reported here. The presence and distribution of CZTS nanoparticles over the surface of rGO sheet is confirmed from XRD, Raman, SEM and UV-Visible analysis.
关键词： Raman,XRD,Cu2ZnSnS4 (CZTS),reduced graphene oxide (rGO),SEM,Photovoltaic device
更新于2025-09-12 10:27:22
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Colloidal stable Hybrid Inorganic/Organic Nano-composites for Photovoltaic Applications
摘要： In present research work we have demonstrated high performance photovoltaic devices based on the colloidal stable TiO2 nanoparticles. The results demonstrates the higher Zeta potential (ζ) value for the as synthesized TiO2 NPs (+42.3mV) as compare to zeta potential of commercial TiO2 P25 ( -27 mV).The concept depicts enhancement in the charge transfer owing to better dispersion between TiO2 (aq) nanoparticles and MEH-PPV polymer matrix and high stability. The colloidal stability of TiO2 nanoparticles against agglomeration intended for the appropriate conduction pathways as electron acceptor. Poly [2-methoxy-5-(2’ethyl-hexyloxy)-1, 4-phenylene vinylene] (MEH-PPV) polymer have been used as a composite matrix in this study. The results demonstrates a significant improvement in I-V characteristics of device in the case of as synthesized colloidal stable TiO2 (aq) nanoparticles in comparison with commercial TiO2 (P25 Degussa). Thus, ITO/TiO2 (aq)/MEH-PPV/Al assembly device shows better charge transfer because good interaction takes place between TiO2 aq nanoparticles and polymer matrix. Subsequently, short circuit current value (Jsv= 1.9 μA) and open circuit voltage (Voc= 0.44 V) have been achieved .However, in the case of ITO/TiO2 (P25)/MEH-PPV/Al (II) assembly device less Jsc and Voc values 0.68 μA and 0.17 V have been monitored. The reported work may open a promising area of consideration among polymeric stable active layer, the requirement of the modern electronics.
关键词： MEH-PPV polymer,Photovoltaic device,Nanocomposites,TiO2 nanoparticles
更新于2025-09-12 10:27:22
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[IEEE 2018 40th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) - Honolulu, HI (2018.7.18-2018.7.21)] 2018 40th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) - 3D Bioprinting of Cyanobacteria for Solar-driven Bioelectricity Generation in Resource-limited Environments
摘要： We demonstrate a hybrid biological photovoltaic device by forming a 3D cooperative biofilm of cyanobacteria and heterotrophic bacteria. 3D bioprinting technique was applied to engineer a cyanobacterial encapsulation in hydrogels over the heterotrophic bacteria. The device continuously generated bioelectricity from the heterotrophic bacterial respiration with the organic biomass supplied by the cyanobacterial photosynthesis. This innovative device platform can be the most suitable power source for unattended sensors, especially for those deployed in remote and resource-limited field locations.
关键词： 3D bioprinting,heterotrophic bacteria,unattended sensors,hybrid biological photovoltaic device,3D cooperative biofilm,cyanobacteria,bioelectricity
更新于2025-09-11 14:15:04