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Effects of alkali and transition metal-doped TiO <sub/>2</sub> hole blocking layers on the perovskite solar cells obtained by a two-step sequential deposition method in air and under vacuum
摘要： Planar perovskite solar cells (PPSCs) have received great attention in recent years due to their intriguing properties, which make them a good choice for photovoltaic applications. In this work, the effect of alkali and transition metal-doped TiO2 (cesium-doped TiO2 (Cs-TiO2) and yttrium-doped TiO2 (Y-TiO2)) compact layers on the optical, structural and the photovoltaic performance of the PPSCs have been investigated. The perovskite layer syntheses were carried out by depositing a lead iodide (PbI2) layer via spin-coating; converting PbI2 into methyl ammonium iodide (CH3NH3PbI3) by chemical vapor deposition (CVD) and spin-coating at 60 min and 60 s conversion times respectively. The as-deposited PPSCs were studied layer-by-layer using an X-ray diffractometer, scanning electron microscope, and UV-vis diffuse reflectance, transmittance and absorbance. The power conversion efficiency for stable processed perovskite solar cells were 3.61% and 12.89% for air and vacuum processed, respectively.
关键词： TiO2 doping,Chemical vapor deposition,Perovskite solar cells,Spin-coating,Photovoltaic performance
更新于2025-09-23 15:19:57
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Synthesis, properties and photovoltaic performance in dye-sensitized solar cells of three <i>meso</i> -diphenylbacteriochlorins bearing a dual-function electron-donor
摘要： Bacteriochlorins are crucial to photosynthesis in bacteria. Studies of air-stable, meso-substituted bacteriochlorins are rare. We herein report the synthesis, properties, and photovoltaic performance of three new air-stable, meso-substituted bacteriochlorins bearing a dioctylfluorenylethyne (denoted as LS-17), a dioctylaminophenylethynylanthrylethyne (LS-43), and a diarylaminoanthrylethyne (LS-45) as the electron-donating groups. Among these LS-bacteriochlorins, LS-17 displays sharp UV-visible absorption bands whereas LS-43 and LS-45 give rise to broadened and red-shifted absorptions. Electrochemical and DFT results suggest that the first oxidation and reduction reactions of these bacteriochlorins are consistent with the formation of the cation and anion radicals, respectively. For dye-sensitized solar cell applications, photovoltaic performance of the LS-45 cell achieves an overall efficiency of 6.04% under one-sun irradiation.
关键词： bacteriochlorins,dye-sensitized solar cells,properties,synthesis,photovoltaic performance
更新于2025-09-23 15:19:57
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Several economical and eco-friendly bio-carbon electrodes for highly efficient perovskite solar cells
摘要： One of the major problems limits the applications of perovskite solar cells (PSCs) is the high cost of hole transporting materials (HTMs) and noble metallic electrodes. For HTMs and noble-metal-free PSCs, carbon materials have been utilized as counter electrodes (CEs). In this paper, four kinds of ultra-low-cost bio-carbon materials have been applied and compared in PSCs. Results showed that the photovoltaic performance of PSCs based on different bio-carbon CEs was determined by the interfacial connection, work function (WF), sheet resistance, crystallinity, and morphology of these bio-carbons. The high PCE (12.82%) of PSCs based on bio-carbon CEs has been achieved in current state-of-the-art. PSCs based on bio-carbon CEs was more stable than that of conventional devices, which could retain 87% of their initial PCE after storing for 2000 hours in room temperature. Our work proposes a new pathway for the exploration of low-cost bio-carbon materials and could accelerate the applications of PSCs based on carbon electrode.
关键词： stability,perovskite solar cells,counter electrodes,photovoltaic performance,bio-carbon
更新于2025-09-23 15:19:57
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Efficient Solar Cells based on Concerted Companion Dyes Containing Two Complementary Components: An Alternative Approach for Cosensitization
摘要： With the purpose to achieve panchromatic absorption for constructing efficient dye-sensitized solar cells (DSSCs), the cosensitization approach of using two dyes with complementary absorption has been developed with great success. However, this approach usually requires time-consuming optimization of a number of parameters for controlling the ratio and distribution of the two coadsorbed dyes on TiO2 film, which limits the potentials of this strategy. We herein report an alternative approach for developing efficient DSSCs by designing a class of “concerted companion dyes” with two complementary dye components linked covalently. Thus, a newly synthesized organic dye Z2 was linked to a recently reported doubly strapped porphyrin dye XW51 through flexible chains with various lengths to afford XW60?XW63. These dyes exhibit excellent absorption and efficiencies in the range of 8.8%-11.7%. Notably, upon coadsorption with chenodeoxycholic acid (CDCA), XW61 affords an impressive efficiency of 12.4%, a record for iodine electrolyte-based DSSCs, to the best of our knowledge. In addition, these dyes also exhibit the advantages of easy cell fabrication, simple optimization, as well as excellent photostability.
关键词： dye-sensitized solar cells,photovoltaic performance,concerted companion dyes,cosensitization,panchromatic absorption
更新于2025-09-23 15:19:57
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Simultaneously improving the photovoltaic parameters of organic solar cells <i>via</i> isomerization of benzo[ <i>b</i> ]benzo[4,5]thieno[2,3- <i>d</i> ]thiophene-based octacyclic non-fullerene acceptors
摘要： Fused-ring electron acceptors (FREAs) have attracted immense interest owing to their ability for facile structural modification and good thermal and optical characteristics. Among these acceptors, isomerized building blocks originate from multiple reaction sites affect the electronic structures, morphological properties and resulting photovoltaic performance, but have rarely been studied. Herein, three isomeric FREAs, Z1-aa, Z1-ab, and Z1-bb, were synthesized using different reaction sites of benzo[b]benzo[4,5]thieno[2,3-d]thiophene (BTBT)-based fused-ring cores and were used in organic solar cells (OSCs). As compared to Z1-aa and Z1-ab, Z1-bb exhibited red-shifted absorption and a higher maximum molar extinction coefficient. When blended with PM6, Z1-bb-based OSCs exhibited more balanced charge transport compared to those with the PM6:Z1-aa and PM6:Z1-ab blend films, which favored higher short-circuit current density (Jsc) and fill factor (FF). As a result, the OSC devices based on Z1-bb exhibited a power conversion efficiency (PCE) of 12.66% with Voc = 0.98 V, Jsc = 18.52 mA cm-2, and FF = 70.05%, respectively, which are significantly higher than the values recorded for Z1-ab-based (PCE of 9.60%)?and Z1-aa-based (PCE of 4.56%) devices. These results indicate that the isomerization of a fused-ring core originating from a special reaction site could be a promising approach to achieve high-performance OSCs with high Jsc, Voc, and FF.
关键词： Organic solar cells,Isomerization,Fused-ring electron acceptors,BTBT-based fused-ring cores,Photovoltaic performance
更新于2025-09-23 15:19:57
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Novel hydrothermal route for synthesis of photoactive Cu2ZnSn(S,Se)4 nanocrystalline thin film: efficient photovoltaic performance
摘要： This work reports single-step deposition of Cu2ZnSn(S,Se)4 (CZTSSe) nanocrystalline film via simple and non-toxic hydrothermal route. The hydrothermal growth of CZTSSe multinary nanocrystalline film formation based on Ostwald ripening law which results in highly oriented nanocrystalline nanoflakes. The UV–Vis spectroscopy illustrates that maximum absorption was observed in the range of 650–700 nm with band gap energy of 1.48 eV. Structural studies confirm the formation of pure-phase kesterite crystal structure. Further, Raman shift at 174 cm?1, 196 cm?1 and 236 cm?1 shows A1 mode of vibration corresponding to kesterite structure. Densely packed and compact nanoflake formation was observed in SEM studies. Compositional analysis confirms the stoichiometric film formation with expected valence states of CZTSSe stoichiometry: Cu+, Zn2+, Sn4+, S2? and Se2?. The photoelectrochemical cell performance of CZTSSe film photoelectrode was investigated using simple two-electrode system. In dark condition, J–V measurement demonstrates semiconductor behavior and under illumination shows generation of photocurrent of 3.64 mA/cm2 at a photovoltage of 400 mV. The CZTSSe films show photoconversion efficiency (η) of 3.41%, indicating that the hydrothermally grown CZTSSe photocathode is a promising material for film solar cell technology. Electron impedance spectroscopy illustrated generation of charge transport resistance of 465 Ω.
关键词： Hydrothermal route,Photovoltaic performance,Cu2ZnSn(S,Nanocrystalline film,Se)4
更新于2025-09-23 15:19:57
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Modification of NiO <sub/>x</sub> hole transport layer for acceleration of charge extraction in inverted perovskite solar cells
摘要： The modification of the inorganic hole transport layer has been an efficient method for optimizing the performance of inverted perovskite solar cells. In this work, we propose a facile modification of a compact NiOx film with NiOx nanoparticles and explore the effects on the charge carrier dynamic behaviors and photovoltaic performance of inverted perovskite devices. The modification of the NiOx hole transport layer can not only enlarge the surface area and infiltration ability, but also adjust the valence band maximum to well match that of perovskite. The photoluminescence results confirm the acceleration of the charge separation and transport at the NiOx/perovskite interface. The corresponding device possesses better photovoltaic parameters than the device based on control NiOx films. Moreover, the charge carrier transport/recombination dynamics are further systematically investigated by the measurements of time-resolved photoluminescence, transient photovoltage and transient photocurrent. Consequently, the results demonstrate that proper modification of NiOx can significantly enlarge interface area and improve the hole extraction capacity, thus efficiently promoting charge separation and inhibiting charge recombination, which leads to the enhancement of the device performances.
关键词： charge extraction,hole transport layer,NiOx,perovskite solar cells,photovoltaic performance
更新于2025-09-23 15:19:57
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Inorganic photovoltaic cells based on BiFeO <sub/>3</sub> : spontaneous polarization, lattice matching, light polarization and their relationship to photovoltaic performance
摘要： Inorganic ferroelectric perovskite oxides are more stable than hybrid perovskites. However, their solar energy harvest efficiency is not so good. Here, by constructing a series of BiFeO3-based devices (solar cells), we investigated three factors that influence the photovoltaic performance, including spontaneous polarization, terminated ions species in the interface between BiFeO3 and the electrode, and polarized light irradiation. This work was carried out in the framework of density functional theory combined with non-equilibrium Green’s function theory under built-in electric field or finite bias. The results showed that 1) the photocurrent is larger only under a suitable electronic band gap rather than larger spontaneous polarization; 2) the photocurrent reaches the largest in Bi3+ ions terminated interface than in the case of Fe3+ or O2- with SrTiO3 electrode; 3) the photocurrent could be largely enhanced if the polarized direction of the monochromatic light is perpendicular to the spontaneous polarization direction. The results would deepen the understanding of some experimental results of BiFeO3-based solar cells.
关键词： BiFeO3,solar cells,spontaneous polarization,polarized light,photovoltaic performance
更新于2025-09-23 15:19:57
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[IEEE 2020 IEEE International Conference on Industrial Technology (ICIT) - Buenos Aires, Argentina (2020.2.26-2020.2.28)] 2020 IEEE International Conference on Industrial Technology (ICIT) - A Comparative Performance of PV Power Simulation Software with an Installed PV Plant
摘要： Photovoltaic (PV) energy stands out due to the sustainability aspect, being the target of research investments. At University of Campinas, the sustainable campus project carried out the installation of PV plants at the university with the challenge of conducting research in the Campinas-Brazil region. In this way, the present paper simulated the largest PV plant of University of Campinas (336.96 kWp) in different PV power simulation software, aiming to have data for future comparisons with the installed PV system. For this, is it used PVsyst, PV*SOL, and HOMER for simulations, and then compared the result with the months containing the results of power generation for the installed PV plant. As a result, the three software performed well, with generation close to the installed PV plant. It was noticed HOMER optimism, PV*SOL conservatism and a more accurate result for PVsyst. Therefore, the PV plant worked as designed and the peculiarities of the three software were presented as a contribution of the paper.
关键词： PV power simulation,PV plant,Photovoltaic,performance PV system
更新于2025-09-23 15:19:57
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Improved CdS QDSSCs with graphene and anatase-rutile TiO2 composite as photoanodes
摘要： In this paper, we developed a simple and convenient method for incorporating graphene with anatase-rutile TiO2 composite and applied it as photoanode to improve the photovoltaic performance of CdS QDSSCs. Our research indicated in a CdS QDSSC system, the photoelectric conversion efficiency (PCE) of anatase-rutile TiO2 (TGr0) composite photoanode was 86% higher than that rutile TiO2 NRs. We also found that the PCE increased first and then decreased with the change of graphene content after the graphene was introduced into the anatase-rutile TiO2 photoanode. When the ratio of optimized graphene/anatase TiO2 particles composite that spin-coated on rutile TiO2 NRs photoanode was 5%, we attained a maximum PCE of 2.20%, which was 178% and 50% higher than that pure TiO2 NRs (0.79%) and TGr0 (1.47%), respectively.
关键词： Anatase-rutile TiO2,CdS quantum dots,Graphene,Photovoltaic performance
更新于2025-09-23 15:19:57