研究目的
Investigating the effects of a novel bis-dimethylamino-functionalized fullerene derivative (PCBDMAM) as an auxiliary interlayer atop PCBM to form a double fullerene cathode buffer layer (CBL) on the efficiency and stability of inverted planar perovskite solar cells (iPSCs).
研究成果
The incorporation of a PCBDMAM interlayer atop PCBM to form a double fullerene CBL significantly enhances the efficiency and ambient stability of iPSC devices. The PCBDMAM interlayer facilitates the formation of an interfacial dipole layer, reducing the work function of the Ag cathode and minimizing the interfacial energy offset. This leads to improved electron transport and device performance, with the best PCE reaching 18.11%. The higher hydrophobicity of PCBDMAM also contributes to the enhanced stability of the devices under ambient conditions.
研究不足
The study is limited to the specific fullerene derivative (PCBDMAM) and its application in iPSC devices. The scalability and cost-effectiveness of synthesizing PCBDMAM for large-scale applications were not addressed. Additionally, the study focused on MAPbI3 perovskite, and the findings may not be directly applicable to other perovskite compositions.
1：Experimental Design and Method Selection:
The study involved synthesizing PCBDMAM and applying it as an interlayer atop PCBM in iPSC devices to form a double fullerene CBL. The methodology included the fabrication of iPSC devices with and without the PCBDMAM interlayer to compare their performance and stability.
2：Sample Selection and Data Sources:
The samples included MAPbI3 perovskite films grown on NiOx, with PCBM and PCBDMAM as CBLs. Data were sourced from photovoltaic performance measurements, morphological and spectroscopic characterizations.
3：List of Experimental Equipment and Materials:
Fluorine-doped tin oxide (FTO)-coated glass substrates, PbI2, MAI, DMF, DMSO, chlorobenzene, isopropanol, ethanol, acetone, C60, PCBM, BCP, and other chemicals were used. Equipment included a Bruker AV 400 MHz NMR spectrometer, UV–vis–NIR 3600 spectrometer, Keithley 2400 source measurement unit, Oriel Sol 3A solar simulator, and others.
4：Experimental Procedures and Operational Workflow:
The iPSC devices were fabricated by spin-coating perovskite precursor solutions onto FTO/NiOx substrates, followed by deposition of PCBM and PCBDMAM layers, and finally thermal evaporation of Ag electrodes. The devices were characterized for their photovoltaic performance, stability, and interfacial properties.
5：Data Analysis Methods:
The data were analyzed using statistical methods to compare the performance of devices with and without the PCBDMAM interlayer. Spectroscopic and morphological characterizations were used to understand the mechanisms behind the performance enhancement.
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