Deposition Of Organic Polymers Research Articles

Enhanced Photostability and Photoluminescence of PbI2 via Constructing Type‐I Heterostructure with ZnO

Improving the stability of lead iodide (PbI2), especially photostability, is in crucial demand for the realization of application‐level optoelectronic devices. In this regard, deposition of organic polymers on PbI2 as a protective layer is a common strategy to improve its stability, but polymers with low thermal conductivity generally cannot produce the desired effect. Herein, a novel strategy is proposed for improving the photostability of PbI2 at different excitation wavelengths, including 320, 405, and 532 nm, via constructing type‐I heterostructure with ZnO with high thermal conductivity. In addition, due to the type‐I band alignment between PbI2 and ZnO, the photogenerated carriers in ZnO can be transferred to PbI2, resulting in a nearly eightfold photoluminescence enhancement of PbI2 under 320 nm laser excitation. The ZnO as a protective layer forming type‐I heterostructure is evidenced as a feasible strategy for enhancing the photostability and photoluminescence of PbI2, facilitating the development of practical applications.

Effect of Electric and Magnetic States of Substrate on the Deposition of Organic Polymers

The processes of deposition of organic polymers (using lysozyme an example) on substrates with different magnetic and electric states have been studied using a complex of microscopy methods. It is shown that substrates with a well-developed electric relief promote the immobilization of lysozyme. For substrates with a type of freshly cleaved mica, with specific dipole surface structure, the ordering of lysozyme islands in the form of filaments is observed. An effect of lysozyme self-organization with the formation of dendritic structure upon the deposition of cobalt ferrite films on the surface of films is found, which makes such template substrates promising biotropic structures.

Deposition of organic polymers at higher substrate temperatures in atmospheric pressure glow discharge

The atmospheric pressure glow discharge burning in nitrogen with small admixture of organosilicon compounds such as hexamethyldisilazane (HMDSN) or hexamethyldisiloxane (HMDSO) was used for the deposition of thin organosilicon polymer films at deposition temperatures up to 120 °C. The properties of the discharge were studied by means of optical emission spectroscopy and electrical measurements. Mechanical properties of deposited films were characterised by depth sensing indentation technique, optical properties were measured by means of ellipsometry. The films were polymer-like, transparent in visible range and without pinholes.

Controlled ink-jet printing and deposition of organic polymers and solid particles

In this letter, we present a technique for the deposition of inks, organic polymers and solid particles, using a fluid ejector. The ejector design is based on a flextensional transducer that excites axisymmetric resonant modes in a clamped circular membrane. It is constructed by bonding a thin piezoelectric annular ring to a thin, edge supported, circular membrane. Liquids or solid particles are placed behind one face of the membrane which has a small orifice (50–200 μm diam) at its center. By applying an ac signal across the piezoelectric element, continuous or drop-on-demand ejection of photoresist (Shipley Microposit S1400-21, S1400-27, S1805, and S1813), oil-based ink, water, or talcum powder [Mg3Si4O10(OH)2] has been achieved. Successful deposition of photoresist has been accomplished without spinning, and thus without waste. Patterning of 10 μm features, by baking, exposure, and developing, has revealed no defects in the deposition process. A boundary integral method was used to numerically simulate drop formation from the vibrating orifice. Simulations have been used to optimize ejection performance.