Synthesis And Performance Study Of Solar Cell Sensitizing Dyes And Multifunctional Fluorescent Probes Based On Spirobifluorene Structure

Topic 1In order to overcome the problems of poor photothermal stability,serious aggregation effect and low photoelectric conversion efficiency of solar cell sensitizing dyes,this thesis introduces spirobifluorene on the basis of triphenylamine dyes,and designs and synthesizes 8 sets of sensitizing dyes SPF-TM1.,SPF-TM2,SPF-TM3,SPF-TM4,SPF-TM5,SPF-TM6,SPF-TM7 and SPF-TM8.The use of the spirobifluorene 3D orthogonal structure suppresses the dye aggregation effect and dark current,and improves the photothermal stability of the dye.SPF-TM5,SPF-TM6 and SPF-TM7 have a high molar extinction coefficient???,indicating their high ability to capture photons.In addition,SPF-TM6 and SPF-TM7 have a wide absorption range and are capable of capturing a wider range of photons.The dyes SPF-TM3,SPF-TM4,SPF-TM5 and SPF-TM8 adsorbed on the semiconductor film compared to the solution system,only a small range of blue shift:5nm,2nm,5nm and 0nm,indicating dye aggregation effect It is well suppressed.The HOMO level of each dye is much lower than the redox potential of the electrolyte solution?I₃^-/I^-??about-4.84 eV?,which can ensure the smooth regeneration of dyes and electrolytes;the LUMO energy level of each dye is much higher than The energy level of the conduction band of titanium dioxide?TiO₂??-4.0eV?is sufficient to ensure that electrons can be smoothly injected from the LUMO level to the side of the titanium dioxide?TiO₂?conduction band.By Bode plot analysis of Electrochemical impedance spectroscopy?EIS?,it is known that the dyes SPF-TM1,SPF-TM4,SPF-TM5 and SPF-TM8 have long electron lifetimes:23.4ms,13.1ms,19.3ms and 21.54ms.The dyes SPF-TM4,SPF-TM5 and SPF-TM8 all exhibited higher conversion efficiency values:5.38%,5.38%and 5.43%.After 1000 h of solar illumination(100mW.cm^-2),the parameters of the device?Jsc,Voc,FF,and ??showed relatively stable properties,which confirmed the sensitizing dye.SPF-TM1,SPF-TM2,SPF-TM3,SPF-TM4,SPF-TM5 and SPF-TM8 all show good light stability.The dyes SPF-TM1,SPF-TM2,SPF-TM3,SPF-TM4,SPF-TM5 and SPF-TM8 all have high decomposition temperatures?T_d,weight loss of about 5%?,glass transition temperature?T_g?and crystallization temperature?T_c?.It shows that it can form a relatively stable film,which can improve device performance and electronic lifetime.It can be seen that the introduction of spirobifluorene in the molecular structure of the dye can better improve its thermal stability.Topic 2Based on the snails,this topic designed and synthesized a multifunctional fluorescent probe SPF-Probe1 capable of simultaneously detecting hypochlorous acid and hydrazine hydrate.The probe has good selectivity,strong anti-interference ability and low detection limit.The detection limit?LOD?for hydrazine hydrate is12nM,and the quantitative detection is based on the equation y=74.7x+134.1.The limit of detection for hydrazine hydrate?LOD?was 28 nM and the quantitative test followed the equation y=31.8x+460.The probe is capable of stable detection over a wide pH range,such as when detecting hydrazine hydrate,the pH detection range is5-8;when detecting hypochlorite,the pH range is 6-12.In addition,when detecting hypochlorite,the response time was 15 s,and when detecting hydrazine hydrate,the response time was 25 s.