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CoCl2 as film morphology controller for efficient planar CsPbIBr2 perovskite solar cells
摘要： High quality perovskite (PVK) film is quite important to reduce the energy loss (Eloss) and enhance the performance of planar CsPbIBr2 PVK solar cells (PSCs). In this work, 5% PbBr2 is substituted by CoCl2 in inorganic CsPbIBr2 PVK, acting as film morphology controller to slow down the crystallization process. It results in a dense and flat pinhole-free CsI(PbBr2)0.95(CoCl2)0.05 PVK film. Therefore, the trap state density is greatly reduced, which lead to reduce non-radiative recombination of carriers and Eloss, therefore, the open-circuit voltage (Voc) of the device is increased from 1.14V of control sample to 1.25V. The optimal photoelectric conversion efficiency (PCE) is enhanced to 10.43% relative to 6.93% of CsPbIBr2 PSCs. More importantly, the air stability of CsI(PbBr2)0.95(CoCl2)0.05 PSCs is greatly enhanced, which still maintain above 90% in the air of 25(cid:1) and RH=20% for 25 days without encapsulation. This work highlights the great effect of CoCl2 as a morphology controller on improving CsPbIBr2 film quality and device performance.
关键词： energy loss,inorganic perovskite solar cell,crystalline growth,charge transport,film quality
更新于2025-09-23 15:19:57
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Investigation and influence of layer composition of tandem perovskite solar cells for applications in future renewable and sustainable energy
摘要： Future needs a clean source of generated power to meet its ever-increasing demand for electricity. One of the most cost-effective and practically viable sources for clean energy is solar Photovoltaic (PV).. By using tandem solar cells, the absorption range of the solar irradiation spectrum is increased which resulted in better efficiency than a single-junction solar cells. So our research work is based on Perovskite-Perovskite solar tandem cells of MA0.8CS0.2Pb(I0.5Br0.5)3 with 1.8 eV and MAPb0.5Sn0.5I3 with 1.2 eV. Large bandgap and small bandgap subcells give the power conversion efficiency (PCE) of 13.98 % and 18.21% respectively. By accumulating all subcells with suitable interconnecting and recombination layers, we achieved a PCE of 20.9 %. It also unleashes the prospective of all perovskite solar cells in order to achieve its maximum limit of 44.3%.
关键词： Perovskite,solar cell,Tandem,Energy bandgap,2T tandem
更新于2025-09-23 15:19:57
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Thermally Stable Perovskite Solar Cells with Efficiency over 21% via Bifunctional Additive
摘要： The rapid improvements in performance of organic-inorganic perovskite solar cells has been astonishing but its commercialized production requires further achievements on device stability and efficiency. Herein, we introduce a bifunctional additive, biuret, with multiple Lewis base groups to regulate the crystallization process of perovskite crystals and passivate the defects at grain boundaries. Compared with the control, methylammonium lead iodide (MAPbI3), films processed with biuret exhibit increased grain size, reduced trap states density, and more uniform local photoluminescence. The addition of biuret leads to suppressed trap-assisted nonradiative recombination and an efficiency improvement from 18.26% to 21.16%, which is among the highest efficiency for MAPbI3 solar cells with the mesoscopic structure. Meanwhile, as biuret interacts with uncoordinated Pb2+ and iodide from the iodoplumbate complex on two adjacent perovskite grains, the thermal durability of MAPbI3 film is enhanced due to the crosslink through chemical bonding. Under 85°C annealing in nitrogen, the biuret-modified device preserves 94% of its initial efficiency after 12 days while the control cells lose more than half the efficiency.
关键词： crystallization,defect passivation,bifunctional additive,perovskite solar cell,stability
更新于2025-09-23 15:19:57
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Embedding of WO3 nanocrystals with rich oxygen-vacancies in solution processed perovskite film for improved photovoltaic performance
摘要： Seeking strategies of promoting the charge separation and transport of the photo-active layer has been always of significance for the development of high-performance optoelectronic devices. We herein demonstrate an effective way of decorating WO3 nanocrystals in perovskite films for boosted photogenerated carriers transport. The WO3 nanocrystals are generated by a simple technique of pulsed laser irradiation in liquid, then introduced into the perovskite film based on the anti-solvent approach. Such decoration is found helpful for the increase of the short-circuit current density (Jsc) of the device, which leads to the increase of the photoconversion efficiency (PCE) from 17.72% to 19.29%. The improved PCE is mainly due to the decoration of the WO3 at the grain boundaries of perovskite films that facilitates the charge transport between the adjacent grains, which is evidenced by the quenching of the film photoluminescence, shortened carrier lifetime, and increased carrier mobility. We thus believe our study provides an effective way of embedding ordinary metal oxides in perovskite films for enhanced optoelectronic performance.
关键词： Hybrid perovskite solar cell,Pulsed laser irradiation in liquid,WO3 nanocrystals,Charge transport,Oxygen-vacancy
更新于2025-09-23 15:19:57
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Fabrication of perovskite solar cells in ambient conditions
摘要： Perovskite solar cells (PSCs) are currently a centre of attraction for their excellent photovoltaic properties and low fabrication cost. The ef?ciency of PSCs has reached up to 25% which is comparable to silicon-based solar cells, making them the fastest improving photovoltaic technology. All state-of-the-art PSCs are usually fabricated in inert environment conditions such as in nitrogen-?lled glovebox. In this study, we have fabricated well known conventional n-i-p and inverted p-i-n structures of PSCs having methylammonium lead iodide (MAPbI3) as a perovskite photoactive layer in ambient conditions and provided a comparative study on their photovoltaic properties. The highest power conversion ef?ciency (PCE) for n-i-p and p-i-n structures were found to be 16.79% and 8.06% respectively under AM 1.5 G one-sun illumination conditions (100 mW-cm?2). In addition, to investigate the device stability, the variation of short-circuit current density (JSC) under continuous illumination on both structures has been investigated.
关键词： Ambient conditions,MAPbI3,N-i-p,P-i-n,Perovskite solar cell
更新于2025-09-23 15:19:57
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Simulation and optimization of CH3NH3SnI3 based inverted perovskite solar cell with NiO as Hole transport material
摘要： A planar perovskite solar cell (PSC) with p-i-n inverted structure is modeled and simulated using SCAPS software to determine the power output characteristics under illumination. The inverted structure is NiO/CH3NH3SnI3/PCBM where NiO is the hole transport layer (HTL), CH3NH3SnI3 is the perovskite absorber layer and PCBM is the electron transport layer (ETL). Simulation efforts are focused on thickness of three layers, defect density of interfaces, density of states, and metal work function effect on power conversion ef?ciency (PCE) of solar cell. For optimum parameters of all three layers, ef?ciency of 22.95% has been achieved. From the simulations, an alternate lead free inverted perovskite solar cell is introduced.
关键词： Electron transport material,Transparent conducting oxide,Inverted perovskite solar cell,Hole transport material,Device simulation,Defect density
更新于2025-09-23 15:19:57
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Binary synergetic ions reduce defect density in ambient air processed perovskite solar cells
摘要： At present, significant research efforts are being concentrated on enhancing the performance and stability of perovskite solar cells (PSC) by lowering defect traps. In this study, NH4+ and SCN- binary ions as additive were incorporated into perovskite precursor to control the crystal growth. Our best performance based on the devices fabricated under fully open air condition was improved from 15.67 to 18.75%, boosting by 20%. The stability results display that devices containing additive maintained ~90% of the initial efficiency for 400 h in ambient air with a humidity of 30%. We first study the fundamentals of defect properties and carrier recombination kinetics behind the multifaceted role of mixed NH4+ and SCN- ions. Compared to using a single active specie as additive, mixed-ions devices exhibit effective bifacial trap passivation as well as lowered defect density in not only perovskite bulk material but also interfaces significantly, leading to facilitated electron transport. Our work can manifest a simple ambient air based approach by the mixed binary ions as additives in order to potentially promote the commercial prospects of PSCs.
关键词： Ambient air process,Performance and stability,Defect density,Binary synergetic ions,Perovskite solar cell
更新于2025-09-23 15:19:57
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Bifunctional effects of trichloro(octyl)silane modification on the performance and stability of perovskite solar cell via microscopic characterization techniques
摘要： Passivation by small organic compounds can reduce the trap density and enhance humidity and illumination stability of perovskite solar cells (PSCs). However, the small molecule passivated on the perovskite film cannot endure harsh heat stress. Herein, we find that the trichloro(octyl)silane (TC-silane) is an excellent candidate to modify the perovskite surface and grain boundary nondestructively through the formation of heat-resistive silicone layer, leading to comprehensive improvement of efficiency and stability with low cost as well as facile fabrication. The silane is a type of solvent and can be upscaled by solution process in the device. TC- silicone can crosslink the grain boundaries through hydrolytic condensation. The crosslinking silicone can resist the moisture and heat stresses to enhance the stability. Besides, micro-photoluminescence reveals that TC-silane treatment can passivate the perovskite film and enhance the optoelectronic properties through chloride replenishment during releasing hydrogen chloride molecule in the hydrolytic reaction. By utilizing Kevin probe force microscopy, we further uncover that TC-silane forms a dipole layer to facilitate the charge separation. TC-silane passivated PSCs delivers a champion efficiency of 20.03% and remains 80% of initial efficiency for more than 800 h at 70-80% relative humidity in air and for about 80 h under 85 oC thermal stress without encapsulation.
关键词： perovskite solar cell,microscopic characterization,silane passivation,stability,bifunctional effect
更新于2025-09-23 15:19:57
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Novel ethanol vapor annealing treatment of SnO2 quantum dots film for highly efficient planar heterojunction perovskite solar cells
摘要： As a promising electron transport layer (ETL) material, tin oxide (SnO2) has been widely used for high-quality perovskite solar cells (PSCs). To further raise power conversion efficiency (PCE) of the PSCs, it is critical to improve the performance of SnO2 film. Herein, a facile method is proposed to tailor the properties of SnO2 ETL by treating it with ethanol vapor during the annealing process. With such treatment, the conductivity and electron mobility of SnO2 film are improved. More impressively, the absorption peak in intensity of the perovskite film deposited on the ethanol vapor-treated SnO2 (E: SO) shows an increase, and the defect states are also effectively passivated. Thus, the VOC and FF of the devices based on the E: SO are greatly improved. Finally, the device achieves a champion PCE of 17.66%, which is superior to the control device of 16.62%. The results demonstrate that ethanol vapor annealing treatment is an effective method for improving the performance of photovoltaic devices based on SnO2 ETL.
关键词： annealing process,ethanol vapor treatment,tin oxide quantum dot,Perovskite solar cell
更新于2025-09-23 15:19:57
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Inverted pyramid Er3+ and Yb3+ Co-doped TiO2 nanorod arrays based perovskite solar cell: Infrared response and improved current density
摘要： In this study, a Yb3+, Er3+ co-doped TiO2 inverted pyramid nanorod (NR) array and a compact TiO2 ?lm are simultaneously fabricated as the mesoporous support layer and electron-blocking layer, respectively, by a one-pot hydrothermal method. The scanning electron microscopy results show that the incorporation of Er3+ and Yb3+ causes changes not only in the growth rate of the NRs, but also in the TiO2 NR morphology. The Er3+, Yb3+ co-doped TiO2 NRs exhibit an inverted pyramidal morphology, which is bene?cial for perovskite permeation and light utilization. Notably, the Er3+, Yb3+ co-doping causes changes in the band gap of TiO2 and leads to 25% increase in the current density. The electrochemical impedance spectroscopy results show that the device based on the doped TiO2 NRs has a higher recombination resistance and a lower transfer resistance than those of the undoped device, and thereby, the doped device exhibits a lower electron recombination rate. In addition, the upconversion Er and Yb co-doped device exhibits 25% higher current density and 17% higher photon-to-electron conversion e?ciency, as revealed by the J-V test results. Moreover, the optimized e?ciency of the TiO2 NR array-based perovskite solar cell is determined to be 10.02%. Furthermore, the Er and Yb co-doped device exhibits a near-infrared response, an e?ciency of 0.1% is achieved under infrared light (800–1100 nm) irradiation. This upconversion material can widen the photovoltaic responses of solar cells into the near-infrared region and improve the utilization of sunlight.
关键词： Infrared response,Yb3+,Er3+ co-doped,TiO2 nanorods,Perovskite solar cell
更新于2025-09-23 15:19:57