研究目的
To solve the instabilities of hybrid organic-inorganic perovskites in optoelectronic devices by employing MoS2 as 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.
研究成果
MoS2 films can be successfully used as a HTL in perovskites-based rigid/flexible optoelectronic devices, offering high performance, stability, and flexibility. The PPSBs exhibit excellent photodetection and photovoltaic properties, with significant potential for practical applications.
研究不足
The study focuses on the use of MoS2 as a HTL in perovskite-based devices but does not explore other potential materials or combinations that might offer better performance or stability. The long-term stability under various environmental conditions beyond 30 days and 100 h of light soaking is not investigated.
1：Experimental Design and Method Selection
The study employs MoS2 as a hole transport layer in perovskite photodiode/solar cell bifunctional devices. The devices are fabricated on both rigid glass and flexible polyethylene terephthalate (PET) substrates using chemical vapor deposition (CVD) for graphene and MoS2 sheets, and spin-coating for perovskite layers.
2：Sample Selection and Data Sources
Graphene sheets were grown using CVD and transferred onto glass and PET substrates. MoS2 films were synthesized by CVD and transferred to the co-doped graphene surface. Perovskite solution was prepared by mixing lead(II) iodide and methylammonium iodide powders with a solvent.
3：List of Experimental Equipment and Materials
Atomic force microscope (AFM), X-ray photoelectron spectroscopy (XPS), UV-visible-near-infrared optical spectrometer, Kelvin probe force microscopy, 4 probe van der Pauw method, Raman spectroscopy, X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), solar simulator, Keithley 2400 source meter, 450-W xenon light source, monochrometer, current preamplifier, dynamic signal analyzer.
4：Experimental Procedures and Operational Workflow
Fabrication of graphene transparent conductive electrode, MoS2 hole transport layer, and perovskite photodiode/solar cell bifunctional devices. Characterization of structural, optical, and electrical properties of the materials and devices.
5：Data Analysis Methods
Analysis of photovoltaic parameters, responsivity, detectivity, noise equivalent power, and linear dynamic range. Statistical analysis of device performance.
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Source Meter
Keithley 2400
Keithley
Measurement of current density-voltage curves.
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Current Preamplifier
Stanford SR570
Stanford
Measurement of dark current noise.
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Dynamic Signal Analyzer
Agilent 35670A
Agilent
Measurement of dark current noise.
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UV-visible-near-infrared optical spectrometer
Agilent Varian, model cary 5000
Agilent
Measurement of transmittance of the co-doped graphene on a transparent substrate.
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Field Emission Scanning Electron Microscope
Carl Zeiss, model LEO SUPRA 55
Carl Zeiss
Analysis of the cross-sectional structure of the PPSB and the surface of perovskite film.
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Atomic Force Microscope
Park System Model XE-100
Park System
Surface imaging of MoS2 and co-doped graphene sheets.
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X-ray Photoelectron Spectroscopy
Analysis of the state of atomic bonding of MoS2 and co-doped graphene.
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Kelvin Probe Force Microscopy
Park systems, model XE 100
Park systems
Measurement of work functions of MoS2 and co-doped graphene.
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4 probe van der Pauw method
Dasol eng, model FPP-HS8-40K
Dasol eng
Measurement of sheet resistance of the co-doped graphene.
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Solar Simulator
McScinece K201
McScinece
Solar cell mode measurements of the PPSBs.
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Xenon Light Source
Oriel Apex Illuminator, Newport
Newport
Spectral response characterization of the devices.
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Monochrometer
Cornerstone 260, Newport
Newport
Spectral response characterization of the devices.
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