研究目的
To improve the efficiency and stability of formamidinium (FA)-based perovskite solar cells (PSCs) made by scalable blade-coating technique using a generic zwitterion-assisted strategy.
研究成果
The incorporation of PPS additive into precursor ink for scalable fabrication of efficient and stable FA-based PSCs achieved a remarkably enhanced PCE of up to 18.9% with small-area (0.1 cm2) and 16.2% with 1 cm2 active device area, simultaneously exhibiting superior thermal and moisture stability. This strategy provides a facile pathway to obtain the high uniformity and large-area FA-based perovskite films by scalable methods, which provides significant insight into the scalable manufacturing of efficient and stable PSCs.
研究不足
The study focuses on the use of PPS as an additive for FA-based PSCs and its effects on efficiency and stability. The scalability and practical application of the method in industrial settings are not extensively explored.
1：Experimental Design and Method Selection:
The FA-based perovskite films were grown directly onto preheated substrates by one-step blade-coating technique. The PPS-incorporated precursor ink was dripped onto NiOx-coated FTO substrates heated at 150 oC, and followed by a blade coater to spread the solution onto substrates. The perovskite films dried in a few seconds and then annealed at 120 °C for 10 min.
2：Sample Selection and Data Sources:
FTO coated glass substrates were used. The FA-based precursor ink was prepared by mixing PbI2 (
3：05 M), FAI (9 M), and CsI (1 M) in mixed solvent of DMF and DMSO (volume ratio
1).
4：1).
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Field-emission scanning electron microscope (SEM, QUANTA FEG250), X-ray diffraction (XRD) analysis with a Bruker D8 Discover diffractometer, atomic force microscope (AFM, Bruker), photoelectron spectrometer (Escalab 250Xi, Thermo Fisher Scientific, USA), UV-3600 spectrophotometer (Shimadzu, Japan), FTIR spectrometer (Nicolet iS50, Thermo Scientific), Keithley 2612A source meter.
5：Experimental Procedures and Operational Workflow:
The FA-based precursor ink was dripped onto NiOx-coated FTO substrate on a hot plate at 150 oC, then swiped linearly at a high speed about 15 mm s?1 by a blade coater with a gap (≈100 μm) between the blade coater and the substrate. After blading, the resulting film was annealed on a hot plate at 120 °C for 10 min.
6：Data Analysis Methods:
XRD measurements, SEM, AFM, XPS, FTIR, PL and TRPL measurements, SCLC measurements, EIS measurement.
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