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Fabrication and optimization of nanocube mixed halide perovskite films for solar cell application
摘要： In this article, we report the tailoring of nanostructured mixed halide perovskite MAPb(I1-xBrx)3 films with tunable band gap fabricated by anion exchange reaction. In this process, we used PbBr2 and methyl ammonium iodide (MAI) in order to fabricate mixed halide perovskite films. We have observed an uncommon shape transformation from nanocube-hollow tetraoids-nanocubes/plate. The underlying mechanism of shape transformation was discussed based on experimental results. The driving force for such shape transformation is combined effect of anion exchange reaction between I? and Br? at the solid/liquid interface of PbBr2 and MAI, and mechanical driving force exerted by the spin coating process. The shape transformation is highly reproducible, verified by two step process, dipping as well as spinning process. The best performing device using the nanostructured perovskite films in a device architecture FTO/TiO2/MAPb(I1-xBrx)3/Spiri-OMeTAD/Au shows a current density (Jsc,) of 23.58 mA/cm2, open circuit voltage (Voc) of 0.891 V and fill factor (FF) of 0.608, with a power conversion efficiency (η) of 12.79% in forward sweep. In reverse sweep, the device shows the Jsc (mA/cm2), Voc (V), FF, and η (%) are 23.852, 0.891, 0.716 and 15.237, respectively.
关键词： Nanostructured perovskite films,Anion exchange reaction,Shape transformation,Mixed halide perovskite films,Perovskite solar cell
更新于2025-09-19 17:13:59
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Niobium doped TiO2 nanorod arrays as efficient electron transport materials in photovoltaic
摘要： One-dimensional (1-D) rutile TiO2 nanorod arrays (NRAs) synthesized by a hydrothermal method suffer from low electrical conductivity and large amounts of surface defects, hindering their further applications. Nb doping is thus introduced to modify their electronic properties. Results indicate that light Nb doping reduces rod nanosizes, increases electron concentrations, decreases surface defective oxides and lowers conduction band of the TiO2 NRAs, while heavy doping induces transformations of morphologies and crystalline orientations as well as occurrences of compositional deviations and low oxidative states of Ti3t. After 0.1 mol% and 1 mol% Nb incorporations, device efficiencies are substantially improved by ~16% and ~33% for the model perovskite and dye-sensitized solar cells, respectively, which are ascribed to reduced recombination at the perovskite/TiO2 interfaces (e.g. charge lifetime increasing from 62 μs to 107 μs) and improved electron transport through the photoanode of TiO2 NRAs (e.g. electron diffusion length increasing from ~14 μm to ~50 μm). Our study verifies that Nb doped 1-D TiO2 NRAs are versatile electron transporting materials in different kinds of emerging solar cells, and are also potential for other fields including photocatalysis, sensors and batteries etc.
关键词： TiO2 nanorod array,Dye-sensitized solar cell,Niobium doping,Charge transport,Perovskite solar cell,Recombination
更新于2025-09-19 17:13:59
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Glass rod-sliding and low pressure assisted solution processing composition engineering for high-efficiency perovskite solar cells
摘要： High-efficiency perovskite solar cells (PSCs) have experienced rapid development and attracted significant attention in recent years. The PSCs based on doctor bladed or slot-die coated perovskite films usually have lower power conversion efficiency (PCE) than that based on spin-coated perovskite films. In this work, we have developed an effective method, called glass rod-sliding and low pressure assisted solution processing composition engineering (GRS-LPASP), to manufacture high quality perovskite film in air. GRS-LPASP composition engineering effectively increases the grain size and thickness of perovskite films and reduces the defect density by increasing the contact area between the perovskite layer and the hole transport layer, thus leading an increased current density (Jsc) of perovskite solar cells. The device with GRS-LPASP composition engineering achieves a maximum PCE of 19.78%. The experimental results demonstrates that GRS-LPASP composition engineering is a feasible method to prepare high-efficiency PSCs. Moreover, GRS-LPASP composition engineering also provides a potential approach for the commercial production of PSCs.
关键词： Low pressure assisted method,Glass rod-sliding,Perovskite film,Perovskite solar cell
更新于2025-09-19 17:13:59
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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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Numerical simulation of charge transport layer free perovskite solar cell using metal work function shifted contacts
摘要： Perovskite solar cells (PSCs) are one of the fastest emerging photovoltaic (PV) technology at the research level. To achieve higher conversion efficiencies from PSCs, a perovskite absorber layer is stacked between two charge transport layers (CTLs) such as electron and hole transport layers. However, fabrication of defect-free multi-layered PSC is a challenging task, and the presence of CTL and their corresponding interfaces with perovskite enhances the recombination, hysteresis and led to poor stability. Here, in this work, CTL free (i.e., electron and hole transport layer free) PSC is simulated using metal work function shifted contacts. The device presented in this work is free from transport layers and the collection process is with the help of an electric field across the perovskite layer. The electric field is created by using two metals of different work function, i.e., 4.35eV and 5.25eV (can be realized using self-assembled monolayers technique) used as cathode and anode respectively. Simulated CTL free PSC exhibits JSC=17.8 mA.cm-2, VOC=712 mV, FF=68.5% and PCE=8.7% with 250 nm thick perovskite absorber layer having bulk defect density of 2.5x1013 cm-3. Further, a comprehensive study is done in terms of front electrode work function (FEW), front electrode transparency, perovskite thickness and bulk defect density to understand the impact of these parameters on the performance of the device. To understand the behavior of the device, the energy band diagram profile is examined. Reported results show that higher metal work function difference between front and back electrode, higher transparency, and thick perovskite layer with low defect density results in better PV effect in CTL free PSC. Optimized CTL free PSC device delivers JSC=19.9 mA.cm-2, VOC=726 mV, FF=66.8% and PCE=9.7%. The design simulated in this work opens up a new window for next-generation interface defect and hysteresis-free PSC.
关键词： simulation,absorption,SCAPS-1D.,charge transport layer,metal work function,Perovskite solar cell,transparency
更新于2025-09-19 17:13:59
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Ambient stable FAPbI3-based perovskite solar cells with a 2D-EDAPbI4 thin capping layer; 具有2D-EDAPbI4薄覆盖层的环境稳定的FAPbI3基钙钛矿太阳能电池;
摘要： Two-dimensional (2D) lead halide perovskite materials are emerging as one of promising light-absorbing materials in perovskite solar cells (PSCs), which show outstanding stability and defect passivation. Unfortunately, the power conversion efficiency (PCE) of those stable 2D PSCs is still far behind that of 3D PSCs. Herein, we reported a simple in-situ growth technique for the ethylenediamine lead iodide (EDAPbI4) layer on the top of formamidinium lead iodide (FAPbI3) layer. The rationally designed layered architecture of 2D-3D perovskite film could improve the PCE of the PSCs. In addition, benefiting from the high moisture resistance and inhibited ion migration of EDAPbI4 layer, the 2D-3D-based devices showed obviously enhanced long-term stability, keeping the initial PCE value for 200 h and 90% of its initial PCE even after 500 h.
关键词： perovskite solar cell,FAPbI3,stability,2D-3D,EDAPbI4
更新于2025-09-19 17:13:59
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Introduction of Multifunctional Triphenylamino Derivatives at the Perovskite/HTL Interface to Promote Efficiency and Stability of Perovskite Solar Cells
摘要： Surface passivation is a widely used approach to promote the efficiency and stability of perovskite solar cells (PSCs). In the present project, a series of new organic surface passivation molecules, which contain the same triphenylamino group with the hole transfer material of PSCs has been synthesized. These new passivation molecules are supposed to have both “carrier transfer” capability and “defect passivation” potential. We find that by using N-((4-(N,N,N-triphenyl)phenyl)ethyl)ammonium bromide (TPA-PEABr) as a surface passivation molecule, the efficiency of the PSCs can be improved from 16.69% to 18.15%, mainly due to an increased Voc (1.09 V compared with 1.02 V in control devices). The increased Voc is due to the reduced surface defect density and a better alignment for the related energy levels after introducing the TPA-PEABr molecules. Moreover, the stability of the PSCs can be significantly improved in TPA-PEABr passivated devices due to the hydrophobic nature of TPA-PEABr. Our results successfully demonstrate that passivation of the perovskite surface with a carefully designed multiple functional small organic molecule should be a useful approach for more stable PSCs with high efficiency.
关键词： Stability,Surface passivation,Perovskite solar cell,Triphenylamine derivative,Energy level alignment
更新于2025-09-19 17:13:59
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Role of surface recombination in perovskite solar cells at the interface of HTL/CH3NH3PbI3
摘要： In order to achieve the highest performance of organometal trihalide perovskite solar cells, it is required to recognize the dominant mechanisms which play a key role in a perovskite material. In the following studies, we have focused on the interfacial recombination between the hole transporting layer (HTL) and the perovskite CH3NH3PbI3 in solar cell devices with p–i–n architecture. It has been shown that Cu∶NiOx used as HTL drastically decreases a short–circuit photocurrent (Jsc) and an open–circuit voltage (Voc). However, we have found that an addition of PTAA thin layer improves cells quality and, as a consequence, the efficiency of such solar cells increases by 2%. Here, we explain both Jsc and Voc losses with a theory of the "dead layer" of perovskite material where a very high surface recombination occurs. We demonstrate the numerical and experimental studies by the means of series detailed analyses to get in–depth understanding of the physical processes behind it. Using a drift–diffusion model, it is shown that the presence of a parasitic recombination layer influences mostly the current distribution in the simulated samples explaining Jsc and Voc losses. The following results could be useful for improving the quality of perovskite solar cells.
关键词： dead layer recombination,perovskite solar cell,interface recombination
更新于2025-09-19 17:13:59
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Effect of annealing temperature on internal absorption, charge recombination and internal quantum efficiency of HC(NH2)2PbI3 perovskite solar cells
摘要： The effect of annealing temperature for the perovskite layer on the internal absorption(Q), charge recombination and internal quantum efficiency (IQE) of HC(NH2)2PbI3 (FAPbI3) perovskite solar cells (PeSCs) was investigated. The PeSC with FAPbI3 film annealed at 145 °C has relatively better internal absorption, lower charge recombination and higher charge collection, leading to the higher device IQE.
关键词： Charge recombination,Perovskite solar cell,Internal absorption,Internal quantum efficiency
更新于2025-09-19 17:13:59
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Efficient defect-passivation and charge-transfer with interfacial organophosphorus ligand modification for enhanced performance of perovskite solar cells
摘要： Interfacial engineering is an effective method to improve the performance of perovskite solar cells. Nevertheless, it is still challenging to find a material as interfacial layer with the dual function of defect-passivation and efficient charge-transfer. In this work, organophosphorus ligands, trioctylphosphine oxide (TOPO) and triphenylphosphine oxide (TPPO), were used as passivators through antisolvent process for the interfacial modification. Significantly, the organophosphorus ligands can effectively passivate the defects of perovskite crystals through the formation of Pb–O bond between organophosphorus ligand and undercoordinated Pb2t ion in perovskite. More interestingly, benzene rings with π electron in TPPO facilitate the charge transfer between perovskite and hole-transporting layer, achieving the best power conversion efficiency of 18.29% with negligible hysteresis, as well as excellent long-term stability with remaining nearly 85% of the initial efficiency after 2000 h storage under 50% humidity ambient air. In contrast, uncharged octyl alkanes in TOPO hinder the charge transfer and lead to the accumulation of charges at interface although it is a good passivator in light emitting devices for charge confinement. Our findings shed light on the importance of efficient transfer when defect-passivation is employed in solar cell.
关键词： Organophosphorus ligand,Charge-transfer,Defect-passivation,Perovskite solar cell
更新于2025-09-19 17:13:59