研究目的
To improve the stability and photovoltaic performance of perovskite solar cells (PSCs) by using all inorganic materials and ligand exchange on Cu12Sb4S13 quantum dots (QDs) as hole transporting materials (HTMs).
研究成果
The study demonstrates that ligand exchange on Cu12Sb4S13 QDs enhances their electronic coupling and reduces bandgap, leading to improved photovoltaic performance and stability of PSCs. The all inorganic PSCs with Cu12Sb4S13 QDs as HTMs achieve a PCE of 10.02% and retain 94% of their initial PCE after 360 hours in ambient air.
研究不足
The study is limited by the technical challenges in optimizing the ligand exchange process and the interface combination between CsPbI3 QDs and Cu12Sb4S13 QDs, which affects the fill factor and open-circuit voltage of the solar cells.
1：Experimental Design and Method Selection:
The study involves the synthesis of Cu12Sb4S13 QDs via hot-injection method and ligand exchange with 3-mercaptopropionic acid (MPA). The PSCs are fabricated with the structure FTO/c-TiO2/m-TiO2/CsPbI3 QDs/Cu12Sb4S13 QDs/Au.
2：Sample Selection and Data Sources:
The samples include Cu12Sb4S13 QDs before and after ligand exchange, and CsPbI3 QDs. Data are collected from TEM, XRD, FTIR, XPS, UV-vis, PL, and photovoltaic performance measurements.
3：List of Experimental Equipment and Materials:
Materials include CuI, SbCl3, PbI2, cesium acetate, oleylamine, MPA, etc. Equipment includes TEM, XRD, FTIR, XPS, UV-vis spectrophotometer, FESEM, PL spectrometer, and solar simulator.
4：Experimental Procedures and Operational Workflow:
The procedure involves QDs synthesis, ligand exchange, device fabrication, and characterization.
5：Data Analysis Methods:
Data are analyzed using various spectroscopic and photovoltaic performance measurement techniques.
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High-resolution Transmission Electron Microscope
JEM-2100F
JEOL
To characterize the microcosmic morphology of CAS-OLA and CAS-MPA.
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X-ray Photoelectron Spectroscopy
ESCALAB 250Xi
Thermo Fisher Scientific
To characterize the surface bonding of CAS QDs.
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UV-vis absorption
UV-2550
Shimadzu
To characterize the optical absorption properties of Cu12Sb4S13 QDs and PQDSCs.
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Field Emission Scanning Electron Microscope
Zeiss Ultra Plus
Carl Zeiss AG
To characterize the morphology and device thickness.
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Steady-state PL spectra
LabRam HR
HORIBA Jobin Yvon
To measure the hole extraction ability of CAS QDs.
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Electrochemical Impedance Spectroscopy
PGSTAT100
Autolab
To characterize the carrier recombination and hole transporting at the CsPbI3/HTL interface.
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Ultraviolet Photoelectron Spectra
ESCALAB 250Xi
Thermo Fisher Scientific
To characterize the energy band structure of CAS QDs.
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Fourier Transform Infrared Spectroscopy
Nexus
Thermo Nicolet
To explore the surface group exchange after the ligands exchange.
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X-Ray Diffraction
D8 Advance
Bruker AXS
To characterize the crystal structure of CAS-OLA and CAS-MPA.
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Solar simulator
Model 91160-1000
Newport
To perform photovoltaic performance measurements under AM 1.5G simulated irradiation.
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