Experimental Studies on Electrolyte-gated Carbon Nanotube Field Effect Transitors

Owing to unique structure and characteristic of carbon nanotubes, much more are attractions, especially in molecular elements, including field effect transitorsmade of carbon nanotubes. Carbon nanotube field effect transitors with electrolyte-gated are investgated. Carbon nanotubes on glass substrate in this study are fabricated by hot filament vapor deposition using Fe / Ni as catalyst. Optimized multi-walled carbon nanobute transistors are made with Ag contact electrodes, and the KCl solution is used as a gate. Experimental results show that the electrolyte-gated carbon nanotube transitors exhibited a good voltage-current characteristic. The transconductance is about 0.5 mA/V at 2 V. The results obtained are discussed.     

槽式PV/T系统随温度变化的特性分析

为提高太阳电池电效率同时获取可利用的热能,设计制作了槽式聚光太阳能热电联供系统并进行系统测试实验.结果表明:聚光后太阳电池阵列系统热效率随温度升高而线性下降;电池阵列峰值功率点随温度升高左移,电池特性参数FF,Pm,ηe和温度影响系数由聚光前的0.735,117.4W/m2,12.3%和-0.2W/(m2·℃)分别下降到0.39,550 W/m2,6.9%和-5.1 W/(m2·℃)研究工作对提高槽式聚光系统效率和大规模利用聚光光伏发电提供依据,为后续工作提供参考价值.     

太阳电池电势诱导衰减效应表面复合速度机理

电势诱导衰减(potential induced degradation,PID)效应是导致光伏组件输出效率下降的主要原因之一.为了研究PID太阳电池前表面非平衡载流子复合特性,该论文首先分析PID太阳电池表面能带及电场变化情况,利用连续性方程以及电流密度方程建立PID太阳电池表面复合速度SpPID与短波内量子效率(internal quantum efficiency,IQE(λ))之间的数学模型.其次,通过利用太阳电池常用计算模拟软件PClD模拟在不同工艺条件下晶体硅太阳电池IQE(λ),并且采用所构建的数学模型计算PID效应太阳电池前表面复合速度SpPID,与未发生PID效应时前表面复合速度Sp以及I-V特性曲线进行对比.结果表明,利用短波IQE(λ)测量PID太阳电池前表面复合速度SpPID时,波长选择范围在310～360 nm之间误差较小;当太阳电池发生PID效应,前表面复合速度增大,前表面杂质浓度低、钝化效果好的太阳电池输出I-V特性下降,对钝化效果差、表面掺杂浓度高的太阳电池输出Ⅰ-Ⅴ特性影响较小.论文的研究结果为制备抗PID效应组件提供理论基础.