研究目的
Investigating the impact of A-D-A structured dithienosilole and phenoxazine based small molecular material for bulk heterojunction and dopant-free perovskite solar cells.
研究成果
The novel A-D-A structured small molecule Si-PO-2CN demonstrated versatile applications in both BHJ OSCs and PSCs, achieving PCEs of 5.6% and 14.1%, respectively. The study highlights the potential of DTS based building blocks in solar cell applications and suggests further development of new materials for higher efficiency.
研究不足
The study does not discuss the long-term stability of the devices under operational conditions. The efficiency of OSCs is relatively low compared to state-of-the-art materials.
1：Experimental Design and Method Selection:
The study involved the synthesis of a novel A-D-A structured small molecule Si-PO-2CN, employing dithienosilole (DTS) as a building block flanked by electron-rich Phenoxazine (POZ) units terminated with dicyanovinylene. The methodology included UV-visible absorption spectra, cyclic voltammetry (CV), differential pulse voltammetry (DPV), and photoluminescence spectra (PL) to evaluate the optical and electrochemical properties.
2：Sample Selection and Data Sources:
The materials used included Si-PO-2CN, PC71BM, and CH3NH3PbI3 for the fabrication of BHJ OSCs and PSCs.
3：List of Experimental Equipment and Materials:
Instruments such as UV-vis spectrophotometer, CV and DPV setup, and PL spectrometer were used. Materials included chloroform, dichloromethane, and tetrabutylammonium perchlorate.
4：Experimental Procedures and Operational Workflow:
The synthesis route involved alkylation, Vilsmeier-Haack reaction, bromination, Knoevenagel condensation, and Stille cross-coupling. Device fabrication included spin-coating and thermal evaporation.
5：Data Analysis Methods:
The optical band gap was calculated from the onset wavelength of the thin film absorption. HOMO and LUMO energy levels were estimated from CV and DPV.
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