Fengxian Xie,Wallace C. H. Choy,Chuandao Wang,Xinchen Li,Shaoqing Zhang,Jianhui Hou
Graphical A simple one-step method is reported to synthesize low-temperature solution-processed transition metal oxides (TMOs) of molybdenum oxide and vanadium oxide with oxygen vacancies for a good hole-transport layer (HTL). The oxygen vacancy plays an essential role for TMOs when they are employed as HTLs: TMO films with excess oxygen are highly undesirable for their application in organic electronics.
Tandem solar cells are attractive because they can break the Shockley–Queisser efficiency limit of single-junction cells. However, it is still quite challenging to fabricate efficient nonfullerene tandem organic solar cells (OSCs) because of their complicated and vulnerable multilayers and interfaces. The interconnecting layer (ICL) between two subcells is the key part in efficient tandem solar cells, which should be designed properly based on the property of active layers. Herein, the incorporation of hydrogen molybdenum bronze (H x MoO 3 ) between the bottom active layer and PEDOT:PSS/ZnO to form a new ICL is proposed. The contribution of the H x MoO 3 is two fold: 1) it can well wet the hydrophobic active layer surface and form a uniform film. It provides a hydrophilic surface for the following deposition of PEDOT:PSS; 2) the H x MoO 3 has a high work function of 5.4 eV that is higher than PEDOT:PSS (5.0 eV) and can extract holes more efficiently from the active layer with the deep highest occupied molecular orbital energy level. Nonfullerene tandem solar cells with a high fill factor of 76.0% and power conversion efficiency of 15.03% are obtained with this ICL.
Ultrasound (US)-mediated sonodynamic therapy (SDT) has the advantages of non-invasiveness and deep tissue penetration. Nanosystems are prominently used in sonosensitization; however, most nano-sonosensitizers have a low reactive oxygen species (ROS) yield, thus restraining the application of SDT. Sodium molybdenum bronze nanoparticles (SMB NPs) with rich oxygen vacancies are developed and interlayer gaps of molybdenum trioxide nanobelts are expanded. Owing to the increased oxygen vacancy density and wide interlayer gap-induced narrower band gap of SMB NPs, the electrons (e – ) and holes (h + ) generated by US are separated more rapidly, and oxygen vacancies prevent electrons–holes recombination under US irradiation. SMB NPs exhibit a second near-infrared (NIR-II) photothermal effect to promote the generation of ROS by the sonosensitizer. The SMB NPs system is successfully realized to eliminate Staphylococcus aureus ( S. aureus ) and dissipate biofilm. Therefore, multimodal therapy using SMB NPs serves as an effective and promising regimen for deep-seated bacterial infections. The newly developed Mo-based sonosensitizer is presented for the first time to demonstrate excellent antimicrobial activity through hyperthermia-promoting SDT therapeutics. This work proposes a novel strategy in the field of NIR-II photo-amplified SDT with Mo-based materials for bacterial eradication and other important biomedical applications.
危险品化学品经营许可证（带存储）