研究目的
To investigate the preparation of methylammonium bismuth iodide ((CH3NH3)3Bi2I9, MBI) films via a two-stage electric-field-assisted reactive deposition method for solar cells application, focusing on the influences of electric parameters on the morphology and crystal structure of MBI film and its photovoltaic performance.
研究成果
MBI films have been successfully prepared by a novel electrochemical deposition method without annealing for solar cell application. The morphology and structure of MBI films were significantly affected by electric parameters. PCSs based on MBI film deposited by square-wave (AC) voltage mode displayed a corresponding better performance. The PCE of all devices remained nearly unchanged in ambient air for more than 300 h. The electrochemical deposition method can be widely applied for other optoelectronic devices in the future.
研究不足
The study focuses on the preparation and characterization of MBI films and their application in PSCs, but the power conversion efficiency (PCE) of the devices is relatively low. Further optimization of the electrochemical deposition process and device structure is needed to improve the PCE.
1：Experimental Design and Method Selection:
A two-stage electric-field-assisted reactive deposition method was introduced to prepare MBI films. The first step involved the electrodeposition of Bi film onto the FTO/TiO2 substrate, and the second step involved the formation of MBI film in the isopropanol solution of MAI.
2：Sample Selection and Data Sources:
Fluorine-doped tin oxide (FTO) glass substrates were used for solar cell fabrication. The compact TiO2 layer was formed by magnetron sputtering.
3：List of Experimental Equipment and Materials:
Electrochemical workstation (Corrtest, CS350H), UV-Vis spectrophotometer (UV-3600, Shimadzu), X-ray diffraction (XRD) patterns (Bruker-AXS D8 Advance), X-ray photoelectron spectroscopy (XPS, ESCALAB 250Xi), field emission-scanning electron microscopy (FESEM, Jeol JEM 6510LV), atomic force microscope (AFM, Nanoscope-IIIa), solar simulator (Oriel, model 91192-1000), source meter (Keithley 2400, USA), electrochemical impedance spectroscopy (EIS) (Zennium, IM6, Germany).
4：Experimental Procedures and Operational Workflow:
The electrochemical deposition of MBI film included two steps: Bi film fabrication and MBI film formation. The obtained MBI films were washed with isopropanol and dried at 35 °C in the air environment.
5：Data Analysis Methods:
The absorbance spectrum was recorded using a UV-Vis spectrophotometer. The XRD patterns, XPS spectra, FESEM images, AFM images, J–V characteristics, and EIS measurements were analyzed to characterize the samples.
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