RTCVD工艺制备poly-Si薄膜太阳电池的研究

报道了快速热化学气相沉积(RTCVD)工艺制备多晶硅(poly -Si)薄膜及电池的实验和结果。采用SiH_2Co_2作为原料气体，衬底温度为1030℃时，薄膜的生长速率为10nm/s。发现薄膜的平均晶粒度及载流子迁移率与衬底温度和材料有关。用该薄膜在未抛光重掺杂磷的硅衬底上制备1cm~2的p~+n结样品电池，无减反射涂层，其转换效率为4.54%(AM1.5,100mW/cm~2,25℃)。

Electrical bistability and negative differential resistance in diodes based on silver nanoparticle-poly(N-vinylcarbazole) composites

An electrically bistable device has been fabricated using nanocomposite films consisting of silver nanoparticles and a semiconducting polymer by a simple spin-coating method. The current-voltage characteristics of the as-fabricated devices exhibit an obvious electrical bistability and negative differential resistance effect. The current ratio between the high-conducting state and low-conducting state can reach more than 103 at room temperature. The electrical bistability of the device is attributed to the electric-filed-induced charge transfer between the silver nanoparticles and the polymer, and the negative differential resistance behavior is related to the charge trapping in the silver nanoparticles. The results open up a simple approach to fabricate high quality electrically bistable devices by doping metal nanoparticles into polymer.

Effect of sodium alginate concentration on membrane strength and permeating property of poly-l-arginine group microcapsule

A novel poly-l-arginine microcapsule was prepared due to its nutritional function and pharmacological efficacy. A high-voltage electrostatic droplet generator was used to make uniform microcapsules. The results show that the membrane strength and permeating property are both remarkably affected with the changes of sodium alginate concentration. With the sodium alginate concentration increasing, gel beads sizes increase from 233 mum to 350 mum, release ratio is also higher at the same time, but the membrane strength decreases.