研究目的
To demonstrate a facile two-step low-pressure vapor deposition of methyl-ammonium lead iodide (MAPbI3) perovskite films in a single reactor and investigate their air stability and application in solar cells.
研究成果
The study successfully demonstrated the deposition of high-quality MAPbI3 perovskite films using a sequential vapor deposition method in a single reactor. The films showed excellent air stability for 21 days and were used to fabricate planar perovskite solar cells with a best power conversion efficiency of 11.7%. The solar cells maintained 85% of their performance for 13 days under ambient conditions.
研究不足
The study did not perform any c-TiO2 doping or interface engineering, which could have improved the performance and reduced the hysteresis of the solar cells. The devices showed hysteresis, which is attributed to ion migration, ferroelectric polarization, and charge accumulation at the c-TiO2/perovskite interface.
1：Experimental Design and Method Selection:
The study employed a two-step low-pressure vapor deposition method in a single reactor for the deposition of MAPbI3 perovskite films. The first step involved the deposition of PbI2 films, followed by their conversion to perovskite films in the second step through exposure to MAI vapor.
2：Sample Selection and Data Sources:
Corning glass substrates were used for the deposition of PbI2 and perovskite films. The quality and coverage of the perovskite films were controlled by the pre-deposited PbI2 films.
3：List of Experimental Equipment and Materials:
A horizontal ceramic-tube CVD system, lead (II) iodide powder (99%, Sigma-Aldrich), methyl ammonium iodide (MAI) (Dyesol), and nitrogen gas (N2) were used.
4：Experimental Procedures and Operational Workflow:
PbI2 films were deposited at 380°C and then converted to perovskite films by exposure to MAI vapor at 180°C for various times (15, 30, 60, 90, and 120 minutes). The films were characterized using XRD, SEM, XPS, and absorbance measurements.
5：Data Analysis Methods:
The structural, morphological, and compositional properties of the films were analyzed using XRD, SEM, and XPS. The optical properties were investigated using absorbance and photoluminescence spectroscopy.
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