研究目的
To study the impact of dopant exchange among stable, low cost, high glass transition temperature (Tg), and easily synthesized triarylamine-based HTL and radical triarylamine cation salts as dopants on the performance and stability of perovskite solar cells.
研究成果
Low cost carbazole-based HTLs with metal ion-free dopant and multiple 2-ethylhexyl alkyl chains per HTL molecule resulted in PSCs with similar PCE and much higher stability compared to those with spiro-OMeTAD. The increased performance is attributed to the HTL being metal ion-free and having higher hydrophobicity, minimizing moisture diffusion into the perovskite layer.
研究不足
The study focuses on the impact of dopant exchange on PSC performance and stability but does not extensively explore the underlying mechanisms of dopant exchange effects. Additionally, the stability tests were conducted under specific conditions (50℃, 10-20%RH), which may not represent all real-world scenarios.
1：Experimental Design and Method Selection:
The study involved the synthesis of carbazole-based HTLs and analogous oxidized radical cation salts, followed by their application in PSCs to assess performance and stability.
2：Sample Selection and Data Sources:
Mixed perovskite precursor solutions were used, and devices were fabricated on FTO-coated glass substrates.
3：List of Experimental Equipment and Materials:
Materials included various chemicals for synthesis and device fabrication, with equipment such as a solar simulator for J-V curve measurement and a photoelectron spectrometer for work function measurement.
4：Experimental Procedures and Operational Workflow:
The fabrication process involved cleaning substrates, depositing TiO2 layers, spin-coating perovskite layers, and applying HTLs before electrode deposition.
5：Data Analysis Methods:
Performance was evaluated through J-V curves, IPCE spectra, PL and TRPL measurements, and EIS spectra.
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