Hexagonal NaYF4:Yb3+,Tm3+@SiO2 upconversion nanoprism-mixed SiO2 passivation layers are introduced into hole-transport-layer free carbon-based perovskite solar cells to improve the power conversion ...efficiency. This layer on the top of the TiO2 scaffold has multiple functions: (i) upconversion units could transform near-infrared photons to visible region and thus extend the absorption range; (ii) nanoprisms act as light-scattering centers to prolong light-transmission distance and enhance light harvesting; (iii) SiO2 capping layer could suppress charge recombination at the interface of perovskite/TiO2 through passivation effect. The champion efficiency of our carbon-based device with an optimal amount of upconversion nanoprisms is 14.47%, which is 16.1% higher than that of the reference (12.46%). In addition, our unencapsulated solar cells exhibit good stability against moisture and thermal stressing in ambient condition. We also demonstrated another application of our device as a self-powered photodetector with NIR-sensitive features.
Dramatic improvement of organic solar cells conversion efficiency is a significant technical challenge. This includes photon harvesting in the near infrared range of solar spectrum. This work ...presents a robust organic-inorganic hybrid heterojunction solar cell which possesses the capability to convert near infrared photons. Hybrid bulk heterojunctions were fabricated using rare earth decker phthalocyaninato complexes as electron donors, and new a perylenediimide derivative as electron acceptors. The mixtures of the donators and the acceptors were implanted as the active material into an ITO/TiO 2 -active material-TiO 2 /Al cell structure. Conventional solution-based processing was established for the fabrication of these devices. Analysis of the structure, absorption, and photocurrent was done. The photocurrent measurements demonstrated that these devices can harvest photons from UV-VIS to near infrared range. The ITO/TiO 2 -active material-TiO 2 /Al structure showed a significant improvement of the conversion efficiency in comparison to conventional bulk heterojunction solar cells.
Several 5-(4-carboxyphenyl)-10,15,20-tris(phenyl) porphyrin derivatives with different substituents (NO 2 , CN, CH 3 , OCH 3 , CN, NO 2 , Cl, N(CH 3 ) 2 , N(Ph) 2 ) in the para-positions of phenyl ...groups are designed and synthesized for systematic study of structural effect on their photovoltaic performance in dye-sensitized solar cells (DSSCs). Density Functional Theory (DFT) level calculation indicates the decrease of energy levels of frontier molecular orbitals (HOMO and LUMO) when substituents change from NO 2 , CN, Cl, H, OCH 3 , CH 3 , N(CH 3 ) 2 to N(Ph) 2 . Photovoltaic performances of these porphyrins in DSSCs show that introducing of electron donating groups in porphyrins and Zn 2+ ion favors the energy conversion of sunlight to electricity.
This paper introduced composting technology of municipal solid wastes (MSW) with inoculation agent, used complex microbial community, ordure of horse, composting, soil of garden and sewage sludge as ...inoculation agent, the temperature, oxygen consumption rate, organic matters degradation rate and outlet H2S gas were detected and analyzed in composting process. The experimental results indicated that adding inoculation agent to municipal solid wastes were proper for enhancing the composting temperature, oxygen consumption rate and controlling well H2S gas. Especially, when adding complex microbial community or ordure of horse as inoculation were effective to compose organic matter and speed up composting into humus. Therefore, adding inoculation agent to MSW greatly influence the rate of organic degradation and was useful to improve composting conditions.
