【摘要】 <正> CdTe(能隙E_g=1.45 eV)是一种制作太阳电池的理想半导体村料。用阴极电沉积法制备多晶CdTe薄膜具有方法简单、周期短、材料费用低于单晶硅而接近非晶硅等优点,颇引人注目。但该技术发展较晚,因此对其成膜机理,各种因素对薄膜质地、内部结构和光电性能的影响尚缺乏足够了解。本文通过实验发现:采用双阳极、调节电沉积电流、改变电解液组成,可使CdTe薄膜表面平整、不易产生枝晶。如进一步在氩气或空气流中进行热处理,可使薄膜中CdTe晶粒增大到0.4～0.5μm,最大可达0.7～0.8μm,并使伴生的CdTe孪晶现象也更明显,这些对CdTe薄膜光电转换性能的提高是有利的。更多还原

【Abstract】 A study of micro-structural marphologies of CdTe thin-film from different technological processes is carried out with SEM and TEM. The change of crystal during the deposing processes was observed, and a comment for mechanism of crystal growth is given. The preliminary results are; (1) Both anode, change of electrolyte composition and rectification of electrodeposited current can possibly decrease the cathodic polarization of CdTe electrodeposited processes. So the surface of 3s CdTe film has a closer texture than that of 1# and 2#; (2) The crystallite size of 3# deposited from electrolyte B after annealing in argon and heating in air can be increased to 0. 4~0. 5μm; (3) It is found that CdTe twin crystal exists in the CdTe polycrystallites from the cathodic deposition after annealing in argon and heating in air. The close texture, big crystal and twins-are very advantageous for the improvement of solar-cell.更多还原