研究目的
To address the hydroscopic nature of Li-TFSI and low boiling point of t-BP in hole transport layers (HTL) of perovskite solar cells (PSCs) by introducing a dual functional dopant PFPPY to improve power conversion efficiency (PCE) and long-term stability.
研究成果
The introduction of PFPPY as a dual functional dopant in HTL significantly improves the PCE and stability of PSCs. The PFPPY-based device achieved a PCE of 21.38% and maintained over 90% of its initial efficiency after 600 hours under ambient conditions, demonstrating the potential of PFPPY in enhancing PSC performance and durability.
研究不足
The study focuses on the dopant's effect within the HTL and its impact on PSC performance and stability. Potential limitations include the scalability of PFPPY synthesis and its compatibility with other PSC architectures.
1：Experimental Design and Method Selection:
The study involved the synthesis of a novel organic small molecule dopant PFPPY and its application in HTL of PSCs. The doping effect was confirmed through UV-Vis absorption and EPR studies.
2：Sample Selection and Data Sources:
Perovskite solar cells with different HTL compositions were fabricated and characterized.
3：List of Experimental Equipment and Materials:
Instruments included UV-Vis spectrophotometer, EPR spectrometer, SEM, AFM, and conductivity measurement setup. Materials included Spiro-OMeTAD, Li-TFSI, t-BP, FK209, and the newly synthesized PFPPY.
4：Experimental Procedures and Operational Workflow:
The PFPPY was synthesized and characterized. HTLs with varying PFPPY concentrations were prepared and applied in PSCs. The devices were then tested for photovoltaic performance and stability.
5：Data Analysis Methods:
Conductivity and hole mobility were measured using two-probe electrical conductivity method and SCLC method, respectively. Photovoltaic performance was evaluated through J-V measurements and IPCE spectra.
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