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Zwitterion-Stabilizing Scalable Bladed ?±-Phase Cs <sub/>0.1</sub> FA <sub/>0.9</sub> PbI <sub/>3</sub> Films for Efficient Inverted Planar Perovskite Solar Cells
摘要： Perovskite solar cells (PSCs) have attracted considerable attention as a prominent photovoltaic technology, yet the state-of-the-art PSCs still contain thermally unstable methylammonium (MA) cations and use laboratory-level assembly methods, making the device's stability and scalability challenging. Herein, we demonstrate a generic zwitterion-assisted strategy to improve the efficiency and stability of formamidinium (FA)-based PSCs made by scalable blade-coating technique. The zwitterion, 3-(1-pyridinio)-1-propanesulfonate (PPS), plays dual roles in effectively suppressing the formation of undesirable δ-phase and passivating the trap states of FA-based perovskite films. As a consequence, uniform FA-based perovskite films with area as large as 16 cm2 were successfully obtained and the small-area (0.1 cm2) device incorporating PPS achieved a champion efficiency up to 18.9%, as well as enabled a best efficiency of 16.2% for large-area (1 cm2) device. More importantly, unencapsulated devices with PPS also exhibited superior thermal and moisture stability, remaining at 88% of initial efficiency after aging in air for 1000 h. This methodology provides a low-cost and facile pathway to realize the synergistic effect of crystallization modulation and defect passivation for large-scale perovskite devices with excellent optoelectronic performance and stability.
关键词： formamidinium-based films,perovskite solar cell,blade-coating,stability,defect passivation
更新于2025-09-23 15:19:57
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Fabrication of nickel oxide composites with carbon nanotubes for enhanced charge transport in planar perovskite solar cells
摘要： As the conductivity of metal oxides is often insufficient for use in inverted planar perovskite solar cells (PSCs), a hybrid hole transporter consisting of carbon nanotube (CNT)-embedded nickel oxide (NiOx) is suggested to enhance the conductivity. Fully solution-processed NiOx/CNT composites are prepared by introducing CNTs (0–20 vol.%) into a NiOx solution. Raman spectroscopy confirms successful incorporation of the CNTs in the NiOx-based hybrid material. Also, enhanced conductivity of NiOx by introducing CNTs is confirmed by conductance measurement and conductive atomic force microscopy. Furthermore, the enhanced charge extraction properties of the NiOx/CNTs hybrid are evidenced by transient photocurrent, steady-state and time-resolved photoluminescence. Electrochemical impedance spectroscopy reveals a reduction in charge recombination when the hybrid material is used as the hole transport layer (HTL) in PSCs. Interestingly, the average power conversion efficiency (PCE) of the PSCs is increased from 13.1% to 15.1% by applying this hybrid HTL. The best-performing cell, using NiOx/CNTs (7.5 vol.%), exhibits a PCE of up to 16.9%. This unprecedented HTL provides a fundamental method for enhancing the performance of inorganic charge transporters for solution-processed inverted planar PSCs.
关键词： carbon nanotube,perovskite,solar cell,charge transport,nickel oxide
更新于2025-09-23 15:19:57
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Novel hole transporting material based on tetrathiafulvalene derivative: A step towards dopant free, ambient stable and efficient perovskite solar cells
摘要： Performance of hole transporting material (HTM) plays a fundamental role in estimating overall efficiency of perovskite solar cell (PSC). Dopant free HTMs with high intrinsic hole mobility and stability have been emerged as a fascinating choice for production of highly efficient and stable PSCs. Here, we report facile synthesis and implementation of a novel tetrathiafulvalene (TTF) derivative as a dopant free HTM for efficient and ambient stable PSC. The PSC based on dopant free TTF HTM shows remarkable photovoltaic efficiency of 15.66% which is one of highest value for any TTF based HTM. Beside efficiency, PSC based on TTF HTM shows only about 16% decline in initial efficiency even after 45 days storage in ambient conditions without any encapsulation which verifies its excellent ambient stability and hydrophobicity. Furthermore, various physical, electrochemical, photovoltaic and optical parameters of TTF HTM are investigated by highly specialized characterization tools. We affirm these results will be helpful for developing novel HTMs for highly efficient and stable PSCs in future.
关键词： Stability,Hole transporting material,Tetrathiafulvalene,Perovskite solar cell,Efficiency
更新于2025-09-23 15:19:57
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Efficiency Improvement of MAPbI3 Perovskite Solar Cells Based on a CsPbBr3 Quantum Dot/Au Nanoparticle Composite Plasmonic Light-Harvesting Layer
摘要： We demonstrate a method to enhance the power conversion efficiency (PCE) of MAPbI3 perovskite solar cells through localized surface plasmon (LSP) coupling with gold nanoparticles:CsPbBr3 hybrid perovskite quantum dots (AuNPs:QD-CsPbBr3). The plasmonic AuNPs:QD-CsPbBr3 possess the features of high light-harvesting capacity and fast charge transfer through the LSP resonance effect, thus improving the short-circuit current density and the fill factor. Compared to the original device without Au NPs, a 27.8% enhancement in PCE of plasmonic AuNPs:QD-CsPbBr3/MAPbI3 perovskite solar cells was achieved upon 120 μL Au NP solution doping. This improvement can be attributed to the formation of surface plasmon resonance and light scattering effects in Au NPs embedded in QD-CsPbBr3, resulting in improved light absorption due to plasmonic nanoparticles.
关键词： quantum dot,perovskite solar cell,CaPbBr3,Au nanoparticle,localized surface plasmon
更新于2025-09-23 15:19:57
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A perovskite solar cell owing very high stabilities and power conversion efficiencies
摘要： Owing to the superior optoelectronic properties of perovskite materials, the power conversion efficiency (PCE) of perovskite solar cells (PSCs) has been increased dramatically within several years, but the poor thermal, humidity, and light stability of these PSC devices hinders the progress to their practical application. We obtained an inspiration from two-dimensional (2D) Ruddlesden–Popper perovskite solar cells with good photovoltaic performance and placed the organic-inorganic hybrid perovskite layer inside two fully-inorganic CsPbI3 perovskite layers in the cubic α phase. The middle layer has lower stability than the two outer ones, which protect the middle layer by impeding the organic ions of the organic-inorganic hybrid perovskite middle layer from diffusing outside and causing damage to neighbor CTLs. Water molecules from air are also obstructed from reaching the hybrid perovskite layer. We used 1-butyl-3-methylimidazolium tetrafluoroborate (BMIM-BF4) ionic liquid and 3-(decyldimethylammonio) propane-1-sulfonate (DDMAPS) and obtained phase-stable fully-inorganic α phase CsPbI3. The constructed PSCs have extremely high stabilities and high PCEs. After 1000 h of illumination under AM1.5 illumination in air at 60 °C (Humility: ~60%), PSCs with a sandwich structure of three perovskite layers maintain nearly all the original PCE of 21.32%, while those without that only remain 76.63%.
关键词： Stability,Power conversion efficiency,Perovskite solar cell
更新于2025-09-23 15:19:57
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Tailoring optoelectronic properties of CH3NH3PbI3 perovskite photovoltaics using al nanoparticle modified PC61BM layer
摘要： In photovoltaics, light harvesting is one of the critical factors for the enhancement of power conversion efficiency (PCE). Photon harvesting can be carried out by various methods in perovskite photovoltaic. The improved light harvesting can also be achieved by trapping the light by incorporating metallic nanoparticles at the interface or in the perovskite active layer itself. Either light is absorbed or scattered by metallic nanoparticles depending on the particle size. When light is absorbed by the nanoparticles (size < 20 nm), it behaves like a sub-wavelength antenna due to localized surface plasmon resonance (LSPR) excitation and hence near field effect of plasmonic particle will be interacting to CH3NH3PbI3 active layer. Larger particles (> 20 nm) act as sub-wavelength scattering centers of light and help in trapping incident light. In order to make use of dual effect poly-dispersed spherical aluminium nanoparticles (AlNPs) (size – 20–70 nm) were incorporated in the CH3NH3PbI3 perovskite solar cell at the PC61BM/Al electrode interface. As a result, there is an increase in the optical absorption in the AlNPs embedded device. A detailed study of optical absorption, absorbed light emission characteristics charge trap density and carrier concentration studies, photovoltaic property measurements indicates, improvement in power conversion efficiency arise due to enhancement in JSC. Evaluated device properties indicate that enhancement in JSC arises due to improvement in the active layer photon absorption by both scattering and plasmonic effect in addition to reduced series resistance.
关键词： Trap states,Organic-inorganic halide perovskite solar cell,Ultraviolet plasmonic resonance,Plasmonic nanoparticle current density,Metal nanoparticles
更新于2025-09-23 15:19:57
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Development of a New Maximum Power Point Tracking Method for Power Conversion Efficiency Measurement of Metastable Perovskite Solar Cells
摘要： A new algorithm for the maximum power point tracking (MPPT) method has been developed in order to determine the maximum power (Pmax) for slow-responding metastable PV devices such as perovskite solar cells (PSCs). It is well known that such devices often cause significant Pmax oscillation during a standard MPPT measurement. This oscillation was found to occur caused by difference in the current acquired after increasing the voltage and that acquired after decreasing the voltage. The new algorithm developed in this paper has eliminated such oscillation with comparison between the powers at different voltages after changing the voltage in the same direction. Pmax data determined by using this algorithm were found to be reliable by comparing with those determined by the dynamic I-V measurements.
关键词： Maximum Power,MPPT,Oscillation,Perovskite Solar Cell
更新于2025-09-23 15:19:57
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Influence of Film Thickness on the Electronic Band Structure and Optical Properties of Pa??Ia??N CH <sub/>3</sub> NH <sub/>3</sub> PbI <sub/>3a??x</sub> Cl <sub/>x</sub> Perovskite Solar Cells
摘要： The phenomenal optoelectronic properties of lead halide perovskites have spurred a remarkable worldwide effort to develop them as photovoltaic materials. The morphology and crystal structure of the films have a profound effect on the characteristics and performance of devices; however, the influence of underlying hole transport layers (HTLs) or electron transport layers (ETLs) and film thickness on the film morphology and electronic characteristics remains unclear. In this work, we have studied the characteristics of perovskite films with variable thickness, including the morphological, crystal, optical properties and electronic band structure of these films using scanning electron microscopy (SEM), X-ray diffraction (XRD) and ultraviolet-visible (UV-vis) absorption spectra. The corresponding performance of perovskite solar cells (PSCs) devices was correlated with the different thicknesses of perovskite films. Additionally, ultraviolet photoelectron spectroscopy (UPS) results show that for the optimized perovskite thickness (310 nm) the interfacial dipole (?) formed at the interface with the substrate reaches its highest value of 0.23 eV. Hence, this strong dipole compared to other thicknesses allows the carriers to be swept out efficiently.
关键词： Film thickness,Perovskite,Solar cell,Interfacial dipole
更新于2025-09-23 15:19:57
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Higha??Throughput Characterization of Perovskite Solar Cells for Rapid Combinatorial Screening
摘要： In order to discover the ideal perovskite material for solar cell application, a large parameter space (composition, surrounding condition, fabrication technique etc.) must first be explored. Hence, screening this parameter space using a rapid combinatorial screening approach could drastically speed-up the rate of discovery. During the last decade, these discoveries and optimization processes of perovskite materials have been achieved using simple lab-scale deposition techniques and characterization methods, resulting in a substantial time-consuming process, slowing the rate of progress in field of photovoltaics. Thus, the benefits of developing fully-automated, high-throughput characterization techniques become apparent. In this paper, we detail a high-throughput solar cell testing system that enables parallel, real-time and comprehensive measurements, allowing for 16 solar cells to be characterized simultaneously. We show the importance of measurement reproducibility, condition verification and structured data post-processing.
关键词： Characterization,High-throughput,Perovskite Solar Cell
更新于2025-09-23 15:19:57
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Self-powered and flexible perovskite photodiode/solar cell bifunctional devices with MoS2 hole transport layer
摘要： Hybrid organic-inorganic perovskites are highly attractive for the use in optoelectronic devices, but their instabilities should be solved before the practical applications. As one of the solutions, it is important to find a transport layer that can improve the stability and durability of the devices. Here, we first employ MoS2 for a hole transport layer (HTL) in high-performance flexible p-i-n-type perovskite photodiode (PD)/solar cell bifunctional devices (PPSBs) with co-doped graphene transparent conductive electrodes. The current of the PPSB increases by up to 106 times by illumination even at 0 V, meaning “self-powered”. The PPSB exhibits high responsivity and on/off ratio in a broad spectral range of ultraviolet to visible light at a PD mode and good photovoltaic properties at a solar cell mode. The photoresponse shows only 38 % degradation during 30 days, and the photo-stability is almost perfect under continuous light soaking for 100 h. Flexible PPSB exhibits excellent mechanical properties by maintaining ~57 % of its initial photocurrent even after 3000 bending cycles at a curvature radius of 4 mm. These results suggest that MoS2 films can be successfully used as a HTL in perovskites-based rigid/flexible optoelectronic devices.
关键词： photodiode,co-doping,MoS2,graphene,bifunctional,hole transport layer,perovskite,solar cell,self-powered
更新于2025-09-23 15:19:57