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Design of hole-transport-material free CH3NH3PbI3/CsSnI3 all-perovskite heterojunction efficient solar cells by device simulation
摘要： The hole-transport-material (HTM) free perovskite solar cells (PSCs) have drawn great attentions due to the simple structure, low fabrication cost and long term stability. However, the photoelectric conversion efficiency (PCE) of the HTM-free PCSs are still low comparing with the traditional sandwich type PSCs. In this work, a new HTM-free PSC is proposed with CH3NH3PbI3/CsSnI3 all-perovskite heterojunction as light-harvester and carbon as back electrode through simulation using the wxAMPS tools. The results are analyzed and compared with the traditional HTM-free perovskite solar cells. It reveals that the narrow band gap CsSnI3 broadens the absorption spectrum to near-infrared region and the high hole mobility favors efficient hole transfer. The optimal performance is achieved as Voc = 1.08 eV, Jsc = 25.33 mA/cm2, FF = 79.27%, PCE = 21.64%. Comparing to the bare CH3NH3PbI3 absorbing layer, the device efficiency of CH3NH3PbI3/CsSnI3 heterojunction is improved from 18.29% to 21.64%. This indicates that the proposed HTM-free PSC is promising for future photovoltaic and optoelectronics applications.
关键词： HTM-free,All-perovskite,Simulation,CH3NH3PbI3/CsSnI3 heterojunction
更新于2025-09-23 15:19:57
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Double-Mesoscopic Hole-Transport-Material-Free Perovskite Solar Cells: Overcoming Charge-Transport Limitation by Sputtered Ultra-Thin Al <sub/>2</sub> O <sub/>3</sub> Isolating Layer
摘要： The electrically insulating space layer takes a fundamental role in monolithic carbon-graphite based perovskite solar cells (PSCs) and it has been established to prevent the charge recombination of electrons at the mp-TiO2/carbon-graphite (CG) interface. Thick 1 μm printed layers are commonly used for this purpose in the established triple-mesoscopic structures to avoid ohmic shunts and to achieve a high open circuit voltage. In this work, we have developed a reproducible large-area procedure to replace this thick space layer with an ultra-thin dense 40 nm sputtered Al2O3 which acts as highly electrically insulating layer preventing ohmic shunts. Herewith, transport limitations related so far to the hole diffusion path length inside the thick mesoporous space layer have been omitted by concept. This will pave the way towards the development of next generation double-mesoscopic carbon-graphite based PSCs with highest efficiencies. Scanning electron microscope (SEM), energy dispersive x-ray analysis (EDX) and atomic force microscopy (AFM) measurements show the presence of fully oxidized sputtered Al2O3 layer forming a pseudo-porous covering of the underlying mesoporous layer. The thickness has been finely tuned for the achievement of both electrical isolation and optimal infiltration of the perovskite solution allowing full percolation and crystallization. Photo voltage decay, light-dependent and time-dependent photoluminescence measurements showed that the optimal 40 nm thick Al2O3 not only prevents ohmic shunts but also efficiently reduces the charge recombination at the mp-TiO2/CG interface and, at the same time, allows efficient hole diffusion through the perovskite crystals embedded in its pseudo-pores. Thus, stable VOC of 1 V using CH3NH3PbI3 perovskite has been achieved under full sun AM 1.5 G with stabilized device performance of 12.1%.
关键词： Perovskite solar cells,Al2O3 Space layer,Double-mesoscopic,Carbon-graphite,HTM-free,Sputtering,Interface recombination
更新于2025-09-19 17:13:59
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Investigating the effect of polythiocyanogen on morphology and stability of the perovskite layer and its application in the hole-transport material free perovskite solar cell
摘要： Over the recent years, solid-state hybrid solar cells based on perovskite organ metal halides, i.e., CH3NH3PbX3 (X= I, Br, or Cl), have attracted considerable attention because of very rapid development and high conventional efficiency. At present, the most challenging part in perovskite solar cells is the high stability, which must be solved before putting them into the practical application. In this study, polythiocyanogen (SCN)n was used as an additive to improve the stability of the perovskite layer at the environmental condition. Polythiocyanogen have been used to replace iodide in CH3NH3PbI3, and the resulting perovskite films CH3NH3PbI3.(SCN)n are used as the active material in hole-transport material (HTM) free perovskite solar cells. Polythiocyanogen in the presence of iodine in the MAPbI3 exhibits semiconductor properties which can improve the performance of the perovskite solar cell. In this work, the CH3NH3PbI3.(SCN)n absorber layers with the various polythiocyanogen amount (0, 8, 16 and 24 mg/mL) and perovskite solar cells with the FTO/C-TiO2/Meso-TiO2/[CH3NH3PbI3.(SCN)n]/Au structure was fabricated. A one-step solution process was used for deposition of the CH3NH3PbI3.(SCN)n absorber layers. UV-Vis spectra and XRD results reveal that polythiocyanogen could protect perovskite layer from degradation. Moreover, polythiocyanogen has photovoltaic properties and CH3NH3PbI3.(SCN)n perovskite solar cell shown better short-circuit current density (Jsc) and subsequently the higher power-conversion efficiency (PCE) as well. By adding a small amount of polythiocyanogen to the conventional layer of perovskite solar cell, the short-circuit current density JSC has increased from 5.26 to 11.75 mAcm-2, and the power-conversion efficiency PCE has increased from 2.95% to 6.27%.
关键词： Perovskite layer,HTM free Perovskite solar cell,Stability,Polythiocyanogen
更新于2025-09-12 10:27:22
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Modeling of a high performance bandgap graded Pb-free HTM-free perovskite solar cell
摘要： In this study, a lead-free nontoxic and hole transport material (HTM)-free perovskite solar cell (PSC) with a novel con?guration of glass/FTO/ZnO/CH3NH3SnI3(cid:1)xBrx/back contact has been modeled and optimized by a solar cell capacitance simulator (SCAPS). The bandgap of CH3NH3SnI3(cid:1)xBrx absorber is tuned in the range of 1.3 eV to 2.15 eV by variation of the Br doping content. To make a comparison, an optimized Pb-based PSC is also modeled. By optimizing the parameters, power conversion ef?ciency (PCE) of 16.30%, open circuit voltage (Voc) of 1.02 V, short circuit current density (Jsc) of 22.23 mA/cm2, and ?ll factor (FF) of 0.72 were obtained. As compare to the reports available in the literature, these results show much improvement and can provide guidelines for production of economic and environmentally friendly PSCs with further ef?ciency enhancement.
关键词： lead-free,perovskite solar cell,SCAPS,bandgap grading,HTM-free
更新于2025-09-11 14:15:04