研究目的
To propose a facile method to prepare efficient CH3NH3PbIx(SCN)3-x-based planar PSCs in ambient conditions and use ammonium salt (NH4Cl, NH4SCN) to regulate the microstructure of CH3NH3PbIx(SCN)3-x perovskite film prepared in ambient air.
研究成果
The introduction of NH4Cl and NH4SCN additives significantly improves the performance and stability of CH3NH3PbIx(SCN)3-x-based planar PSCs fabricated in ambient air. The additives enhance the microstructure, reduce trap-state density, and suppress charge recombination, leading to higher PCE and improved stability.
研究不足
The study focuses on the fabrication of PSCs in ambient air and the use of NH4Cl and NH4SCN additives to improve performance and stability. However, the long-term stability under operational conditions and scalability of the fabrication process are not extensively discussed.
1：Experimental Design and Method Selection:
The study involves the fabrication of CH3NH3PbIx(SCN)3-x-based planar PSCs in ambient air using NH4Cl and NH4SCN additives to regulate the microstructure of the perovskite film.
2：Sample Selection and Data Sources:
Fluorine doped tin oxide (FTO) substrates were used, and perovskite films were deposited on the TiO2 compact layer by a two-step sequential spin-coating method.
3：List of Experimental Equipment and Materials:
SEM (ZEISS ULTRA 55), X-ray diffraction system (X'Pert PRO, CuK’a radiation), solar simulator (Newport 91160, AM
4：5G), source meter (Keithley 2420), standard EQE system (Newport 66902), UV-vis absorption spectra (SHIMADZU UV-2550 spectrophotometer), fluorescence spectrophotometer (HITACHI F-5000), time-resolved PL spectra (Horiba Instruments Incorporated-Fluorolog-3), electrochemical impedance spectroscopy (Zahner electrochemical workstation, Zennium, Germany), conductive atomic force microscopy (Asylum Research, Cypher). Experimental Procedures and Operational Workflow:
The FTO glass was etched, washed, and immersed in titanium tetrachloride aqueous solution for TiO2 compact layer. The CH3NH3PbIx(SCN)3-x films were deposited by spin-coating Pb(SCN)2 solution and CH3NH3I solution, followed by annealing. Spiro-OMeTAD layer was spin-coated, and Ag electrode was thermally evaporated.
5：Data Analysis Methods:
The grain size distribution was analyzed using Nano Measurer software. J-V curves, EQE, UV-vis absorption spectra, PL spectra, TRPL spectra, EIS, and CFM images were analyzed to characterize the devices.
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SEM
ZEISS ULTRA 55
ZEISS
Characterize the morphology of the perovskite film
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source meter
Keithley 2420
Keithley
Record the J-V curves
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UV-vis absorption spectra
SHIMADZU UV-2550 spectrophotometer
SHIMADZU
Measure the UV-vis absorption spectra
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fluorescence spectrophotometer
HITACHI F-5000
HITACHI
Carry out the photoluminescence (PL) spectra
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X-ray diffraction system
X'Pert PRO
Obtain the XRD patterns
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solar simulator
Newport 91160
Newport
Simulate AM 1.5G irradiation
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standard EQE system
Newport 66902
Newport
Conduct the external quantum efficiency (EQE) of the perovskite solar cells
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time-resolved PL spectra
Horiba Instruments Incorporated-Fluorolog-3
Horiba
Collect the time-resolved PL spectra
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electrochemical impedance spectroscopy
Zahner electrochemical workstation, Zennium
Zahner
Obtain the EIS of the PSCs
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conductive atomic force microscopy
Asylum Research, Cypher
Asylum Research
Measure the surface photo-current
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