- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Improvement of resistive memory properties of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)/CH3NH3PbI3 based device by potassium iodide additives
摘要： In this study, a glass/indium tin oxide (ITO)/poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS)/CH3NH3PbI3 (MAPbI3)/poly(methyl methacrylate) (PMMA)/Al nonvolatile memory device is demonstrated. The MAPbI3 film is prepared on top of the PEDOT:PSS by a two-step process, showing a bipolar resistive switching character. Because PEDOT:PSS is widely used as a hole transporting layer for a planar heterojunction perovskite solar cell, the demonstrated memory property of PEDOT:PSS/MAPbI3 combination opens up the application potential for multifunctional optoelectronic memory. The device is improved by introducing potassium iodide (KI) as an additive to ameliorate the quality of MAPbI3 material and PEDOT:PSS/MAPbI3 interface. As compared with the pristine MAPbI3, the KI-doped perovskite device exhibits a resistive switching ON/OFF ratio of 103, better endurance and more stable retention. The KI additive is helpful for forming uniform crystalline grain, high-compact structure and passivation of defect states for MAPbI3 film and interface, which are the main reasons to the improved memory properties. Finally, we suggest that KI has great potential to be used as an additive for constructing a high performance perovskite memory device.
关键词： CH3NH3PbI3,Resistive random access memory,PEDOT:PSS,KI additive
更新于2025-09-23 15:23:52
-
Insertion of Nanoscale AgInSbTe Layer between the Ag Electrode and the CH <sub/>3</sub> NH <sub/>3</sub> PbI <sub/>3</sub> Electrolyte Layer Enabling Enhanced Multilevel Memory
摘要： Hybrid organic-inorganic perovskite, CH3NH3PbI3 (MAPbI3) has attracted great attention as promising building blocks for resistive switching memory. However, the reproductive switching uniformity and long-term environmental stability are always critical issues for practical application. Herein, by inserting nanoscale AgInSbTe (AIST) layer between the Ag electrode and MAPbI3 electrolyte layer (Ag/AIST/MAPbI3/FTO), the switching uniformity and environmental stability of the memory cell can be greatly improved. The suppression of excess Ag ions injection and the protection of MAPbI3 form air exposure with the help of AIST layer are ascribed to be responsible for the above-mentioned characteristics, respectively. Moreover, controllable tri-state switching in the reset process provided the capability of multilevel storage of the memory cells and the related mechanism has been identified as the control of nanoscale conductive filaments rupture in sequence from AIST to MAPbI3 layer. The present work would offer an effective way to develop high uniform and environmental stable MAPbI3-based high density memory systems.
关键词： AgInSbTe,stability,CH3NH3PbI3,uniformity,resistive switching
更新于2025-09-23 15:23:52
-
Improving the efficiency of perovskite solar cells using modification of CH3NH3PbI3 active layer: the effect of methylammonium iodide loading time
摘要： In perovskite (PSK) solar cells, the PSK absorber layer plays a vital role in power conversion efficiency (PCE). In this study, we report on the fabrication of mesoporous PSK solar cells using a two-step spin-coating rout with the structure of glass/FTO/compact TiO2/mesoporous TiO2/CH3NH3PbI3 (MAPbI3)/P3HT/Au. The morphology and crystalline structure of the PSK thin film is controlled by changing the CH3NH3I (MAI) loading times (the 20?s, 30?s, 40?s, 60?s) on PbI2 film. The PSK layers are optimized at different MAI loading times in a two-step process to enhance the PCE of the PSK solar cells. The investigation and comparison of the results show that the solar cell containing the absorber layer prepared by solution loading time of the 40?s is more efficient than the other devices. The champion device shows the open-circuit voltage (Voc) of 0.97?V, short current density (Jsc) of 19.30?mA/cm2, and fill factor (FF) of 0.64, which leads to the best PCE of 12.04%.
关键词： MAI loading time,MAPbI3,Perovskite solar cell,CH3NH3PbI3,Spins coating,Active layer
更新于2025-09-23 15:21:01
-
Solutiona??Processed, Selfa??Powered Broadband CH <sub/>3</sub> NH <sub/>3</sub> PbI <sub/>3</sub> Photodetectors Driven by Asymmetric Electrodes
摘要： In general, the fabrication of high-performance, self-powered broadband photodetectors based on traditional semiconducting thin films is tedious and costly. Here, in this paper a high-performance, solution-processed, and self-powered CH3NH3PbI3 (MAPbI3) nanocrystal based photodetector ITO/MAPbI3/Ag is presented, and it shows broadband photoresponse from the visible to the near-infrared wavelength region. The pronounced enhanced performance of the photodetector is due to taking the advantage of the built-in electric field induced by the work function difference of two electrodes. The optimized photodetector shows a responsivity of 4.9 and 1.42 A W?1 with a specific detectivity of 7.6 × 1013 and 1.77 × 1013 Jones under 19 μW cm?2 white light illumination and 26 μW cm?2 808 nm illumination at zero bias, respectively. Therefore, such a concept of simple device geometry and feasible technique will open up a new and promising avenue for the fabrication of self-powered photodetectors and the development of imaging devices.
关键词： ligand-assisted reprecipitation (LARP),CH3NH3PbI3 nanocrystals,broadband photodetectors,photocurrent imaging
更新于2025-09-23 15:21:01
-
Unraveling the roles of mesoporous TiO2 framework in CH3NH3PbI3 perovskite solar cells; ????-?TiO2????????¨CH3NH3PbI3é??é??????¤aé?3è????μ?±???-????????¨;
摘要： Both of planar and mesoporous architectures prevail for perovskite solar cells (PSCs). However, it is still an open question how the architecture affects the performance of PSCs. The inconsistent results in the references often create confusion. In particular, the specific roles of mesoporous frameworks are yet to be well elaborated and require further clarification. In this study, we carefully compared the properties of perovskite films and the device performances for both architectures to unravel the roles of mesoporous TiO2 frameworks in CH3NH3PbI3 PSCs. The detailed characterizations of structural, microscopic, optical and electrical properties revealed that the presence of mesoporous TiO2 framework contributed to enlarged perovskite crystal sizes, enhanced light harvesting, efficient electron extration and suppressed charge recombination. As a result, compared with the planar device, the mesoporous device yielded an improved power conversion efficiency of 18.18%, coupled with a reduced hystersis. This study reveals the benefits of mesoporous TiO2 framework in PSCs and provides the guidance for the design and optimization of architectures for high-performance devices.
关键词： device architecture,electron transporting layer,electron extraction,CH3NH3PbI3,perovskite solar cells
更新于2025-09-23 15:21:01
-
Amphoteric imidazole doping induced large-grained perovskite with reduced defect density for high performance inverted solar cells
摘要： Intrinsic defect density in polycrystalline halide perovskite films are required to be low enough to suppress charge recombination loss for improvement in performance of perovskite solar cells (PeSCs). In this paper, we propose the use of amphoteric imidazole to achieve high crystalline quality of CH3NH3PbI3 perovskite absorption layer. The imidazole additive plays a synergistic role in controlling the perovskite crystal growth for large grain size and passivating the uncoordinated ions (e.g., Pb2+) defects, resulting in improved carrier transport/lifetime and suppressed non-radiative recombination. The champion power conversion efficiency (PCE) of PeSCs with imidazole is improved to 16.88%, from the control device with a PCE value of 14.65%. Besides, the stability of imidazole modified perovskite films is further improved by limiting ion immigration at grain boundaries against moisture and heat stresses. The findings pave an avenue for synergistically modulating crystallization and healing defect in perovskite to achieve efficient and stable solar cells.
关键词： Defect passivation,CH3NH3PbI3,Grain boundary,Inverted solar cell,Non-radiative recombination
更新于2025-09-23 15:19:57
-
A surface photovoltaic effect-related high-performance photodetector based on a single CH <sub/>3</sub> NH <sub/>3</sub> PbI <sub/>3</sub> micro/nanowire
摘要： With the decrease of materials to the nanoscale, their surface states will play a crucial role in their performance. Here, an individual CH3NH3PbI3 micro/nanowire-based photodetector can show excellent sensitivity and responsivity to light with a wide wavelength range from 200 to 850 nm. A surface state-related photovoltaic effect associated with a surface barrier can be formed due to a depletion of majority carriers (holes) in the surface space charge region. At a low operation voltage, the photodetector can exhibit a low dark current. Upon illuminating near the end connected to the positive electrode, the light-induced decrease of the surface barrier leads to enhanced conduction, showing a large photocurrent. At zero bias, additionally, the photodetector can show a relatively large photogenerated voltage and current when only the vicinity of one end is illuminated. Based on the CH3NH3PbI3 micro/nanostructure performance herein, surface photovoltaic-controlled photodetectors with superior performance will have important applications in new-generation optoelectronic devices.
关键词： CH3NH3PbI3,optoelectronic devices,photodetector,surface photovoltaic effect,micro/nanowire
更新于2025-09-23 15:19:57
-
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
-
Conversion efficiency enhancement of methylammonium lead triiodide perovskite solar cells converted from thermally deposited lead iodide via thin methylammonium iodide interlayer
摘要： The thermally deposited thin methylammonium iodide (MAI) interlayer worked as protection layer of poly (3, 4-ethylenedioxythiophene) poly (styrene sulfonate) (PEDOT:PSS) in the thermal deposition of lead iodide (PbI2). And the thin MAI interlayer could be the MAI supplemental layer during converting the thermally deposited PbI2 into perovskite. The performances of perovskite solar cells (SCs) converted from thermally deposited PbI2 were remarkably enhanced by using the thin MAI interlayer on PEDOT:PSS. The short-circuit current density (JSC), fill factor (FF%), and conversion efficiency (h %) of perovskite SCs converted from thermally deposited PbI2 increased with the initial increase in thickness of the thin MAI interlayer and then reduced when the thickness of thin MAI interlayer exceeded 2.2 nm. Perovskite SCs converted from thermally deposited PbI2 with a 2.2 nm-thick thin MAI interlayer obtained the largest JSC, FF%, and h % at 19.44 mA/cm2, 74% and 12.75%, respectively, in our study. And the largest JSC was more than twice larger than that of perovskite SCs converted from thermally deposited PbI2 without thin MAI interlayer. Although the perovskite SCs converted from thermally deposited PbI2 without thin MAI interlayer has h % much less than that of perovskite SCs converted from spin-coated PbI2. The perovskite SCs converted from thermally deposited PbI2 with 2.2 nm-thick thin MAI interlayer had an h % of 12.75%, which was larger than that of perovskite SCs converted from spin-coated PbI2 at 10.57%.
关键词： perovskite,CH3NH3PbI3,thermally deposited thin methylammonium iodide,thin methylammonium iodide interlayer
更新于2025-09-23 15:19:57
-
The effect of the spinning speed variation on the perovskite solar cell efficiency
摘要： In this work, compact titanitum dioxide (c-TiO2), amorphous titanitum dioxide (mp-TiO2) and methylammonium lead iodide (CH3NH3PbI3) films were prepared by spin coating method under different different rotational speed of the CH3NH3PbI3 films. Many characterization measurements were achieved on the deposited CH3NH3PbI3 films in order to study the change that resulted from different parameters. The X-ray diffraction (XRD) measurements revealed that the lattice constants of the fabricated CH3NH3PbI3 films were close to the slandered values. The atomic force microscopy (AFM) measurements were conducted in order to study the morphology of the fabricated CH3NH3PbI3 films at different scale, these results displayed that the grain size of the CH3NH3PbI3 films in the range between about 160nm to 210 nm. The field emiision scanning electron microscopy (FE-SEM) results of the fabricated CH3NH3PbI3 films were well agreed to the AFM result especially in the grains shape and distribution. Transmittance measurements have been done to determine the variation of the energy gap and absorption coefficient the CH3NH3PbI3 films. The structure form of the perovskite solar cells were FTO/c-TiO2/mp-TiO2/CH3NH3PbI3/Au, the C-V measurements were achieved to determine the built-in potential, which found to have the highest value when using 4000 rpm during the synthesis of the perovskite layer. In addition, the I-V measurements in dark conditions have been conducted to compute the ideality factor and the saturation current, which are considered important parameters that influences the characteristics of the solar cells. The best solar cell efficiency was obtained at spinning speed of 4000 rpm.
关键词： CH3NH3PbI3,efficiency,spin coating,perovskite solar cell,spinning speed
更新于2025-09-23 15:19:57