Vanadium pentoxide (V 2 O 5 ) is a highly promising material for optoelectronic applications due to its wide optical band gap, significant thermal/chemical stability, and intriguing multichromic properties. Nonetheless, the production of uniform and crackfree V 2 O 5 thin films over large areas via conventional deposition methods remain to be a challenge. In this work, we demonstrate deposition of microscopically uniform, large area (15 cm × 15 cm), nanocrystalline and multichromic V 2 O 5 thin films onto fluorine-doped tin oxide (FTO) coated glass substrates via ultrasonic spray deposition (USD) method. Thin-film formation behavior, microstructural and optoelectronic properties of the deposited films were investigated as a function of post-deposition annealing temperature. Electrochromic performance of the fabricated films up to an area of 15 cm × 15 cm was monitored using cyclic voltammetry (CV), where 3 different coloration states of V 2 O 5 were observed under different applied potentials. Electrochromic devices fabricated with the deposited V 2 O 5 thin films were found to be stable up to 1000 cycles. Results presented herein provide a new roadmap for the large area deposition of V 2 O 5 through USD method, which can be readily extended to a vast number of other functional metal oxide systems.

A new model is proposed for slow non-exponential relaxations on germanium surfaces in the d. c. field-effect. It is based on the diffusion of induced charges on localized centres uniformly distributed in the surface oxide layer. The theory is compared with both prcvious and new experimental work on slow states on germanium surfaces and almost complete agreement is found.Es wird fiir die langsamen nicht-exponentiellen Relaxationsphanomene auf der Oberflache von Germanium beim Gleichstromfeldeffekt ein neues Model1 vorgelegt, dessen Grundgedanke in der Diffusion der ifberschufiladung zu den in der oberflachlichen Oxydschicht gleichmaDig verteilen lokalisierten Zentren liegt. Diese Interpretation wird mit bekannten sowie mit neuen Versuchsergebnissen iiber langsame Effekt'e auf Ge verglichen und es wird eine fast vollstandige qualitative Ubereinstimmung gefunden. 3060 90 720 t (sec) -

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