Tunable surface-plasmon-resonance wavelength of silver island films

This paper experimentally and theoretically investigates the effect of the underlayer medium on tuning of the surface plasmon resonance (SPR) wavelength of silver island films,and the effect of substrate temperature on the morphologies and optical properties of the films.From the absorption spectra of single Ag with various thickness and overcoated (Ag/TiO 2) films deposited on glass substrates at various substrate temperatures by RF magnetron sputtering,we demonstrate that the surface plasmon resonance wavelength can be made tunable by changing the underlayer medium,the thickness of metal layer and the substrate temperature.By varying substrate temperatures,the interparticle coupling effects on plasmon resonances of nanosilver particles enhance as the spacing between the particles reduces.When the substrate temperature is up to 500 C,the absorption peak decreases sharply and shifts to shorter wavelength side due to the severe coalescence between silver islands in the film.     

氧氩比对钴掺杂氧化锌薄膜光电性能的影响

以氧化锌陶瓷靶和金属钴靶为靶材,利用磁控共溅射方法制备钴掺杂氧化锌(Co-ZnO)薄膜。研究了氧氩比对薄膜的结构、光学和电学性能的影响。结果表明:薄膜具有类似于ZnO的六方纤锌矿结构,并沿c轴择优生长;当氧氩比为2:8时,薄膜具有较好的纳米晶粒和表面结构,其霍尔迁移率为2.188×104cm2/V·s,最小电阻率为1.326×104Ω·cm,其薄膜透光率最高,且在紫外区有一个相对较强的发射峰。     

有机金属卤化物钙钛矿中的离子迁移现象及其研究进展

近年来,卤化物钙钛矿太阳能电池由于其诸多技术优势引起了普遍的关注,其效率在几年内达到了认证的24.2%,接近目前已经民用化的晶体硅太阳能电池.卤化物钙钛矿在外加电场作用下除了具有电荷传输能力外,还表现出离子迁移现象,是一种兼具半导体和离子导体特性的材料.离子迁移不仅直接改变了钙钛矿晶体的局部化学配比,而且会对材料的电学性质乃至相应器件的工作机理产生极大影响.本文总结了离子迁移的形成机制、基本特征及其对器件工作过程的影响(如可翻转的光伏现象、电流迟滞现象等),介绍了一些关于抑制离子迁移的最新研究进展.目前关于钙钛矿材料中的离子迁移现象的认识仍不全面,深入理解卤化物钙钛矿材料中的离子迁移现象对推动钙钛矿太阳能电池的发展和应用十分重要.