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一、前吉在正常开设普通物理实验期间,我们选用适当的时间开放实验室,让学生在老师的指导下自选研究问题,利用同一种仪器、设备进行不同内容的测量.例如,在“牛顿环”实验中,通常是让学生测量平凸透镜球面的曲车半径R,而在开放实验室时,要求学生利用等厚干涉原理精确测量R的同时,进一步测量其它单色光的波长人,以及充填在牛顿圈之间的透明液体的折射率产,以扩展实验内容,开拓学生的思路.二、实验原理如图la所示,把一个焦距很大的平凸透镜放在标准平晶上,球面与平晶上表面相切于O点,它们之间形成了一个变厚度的空气膜,其… 相似文献
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Electron beam evaporation deposition of cadmium sulphide and cadmium telluride thin films: Solar cell applications7 下载免费PDF全文
Cadmium sulphide (CdS) and cadmium telluride (CdTe) thin films are deposited by electron beam evaporation. Atomic force microscopy (AFM) reveals that the root mean square (RMS) roughness values of the CdS films increase as substrate temperature increases. The optical band gap values of CdS films increase slightly with the increase in the substrate temperature, in a range of 2.42-2.48 eV. The result of Hall effect measurement suggests that the carrier concentration decreases as the substrate temperature increases, making the resistivity of the CdS films increase. CdTe films annealed at 300 ℃ show that their lowest transmittances are due to their largest packing densities. The electrical characteristics of CdS/CdTe thin film solar cells are investigated in dark conditions and under illumination. Typical rectifying and photovoltaic properties are obtained. 相似文献