研究目的
To develop efficient and cost-effective inverted perovskite solar cells (PVSCs) through the use of dopant-free hole transporting materials (HTMs) with facile synthesis and a lower price tag.
研究成果
The study demonstrates that FT-OMeTPA, with its thiophene unit, exhibits higher hole mobility, better charge extraction ability, and stronger interfacial interaction with perovskite, leading to higher power conversion efficiency and operational stability in inverted PVSCs compared to FB-OMeTPA. The findings suggest that FT-OMeTPA is a promising candidate for efficient, low-cost PVSCs.
研究不足
The study focuses on the comparison between two specific HTMs (FB-OMeTPA and FT-OMeTPA) and their performance in inverted PVSCs. The scalability and long-term stability under various environmental conditions are not extensively explored.
1：Experimental Design and Method Selection:
The study involves the synthesis of two organic small molecules with a fluorene core as dopant-free HTMs in inverted PVSCs. The molecules are designed to differ by replacing one of the benzene rings with thiophene to improve coplanarity.
2：Sample Selection and Data Sources:
The samples include FB-OMeTPA and FT-OMeTPA, synthesized through a two-step reaction.
3：List of Experimental Equipment and Materials:
Instruments used include thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), UV-Vis absorption spectroscopy, cyclic voltammetry (CV), atomic force microscopy (AFM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS).
4：Experimental Procedures and Operational Workflow:
The HTMs were spin-coated onto ITO electrodes, annealed, and characterized. Perovskite layers were deposited using an antisolvent method, followed by the deposition of PCBM, BCP, and Ag to form complete PVSCs.
5：Data Analysis Methods:
The performance of PVSCs was evaluated through current-voltage (J-V) characteristics, external quantum efficiency (EQE) spectra, and time-resolved photoluminescence (PL) decay measurements.
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