采用电子束蒸发法制备PbI2多晶膜,研究了制备条件对沉积速率和晶体结构的影响.结果表明,源-衬间距和衬底温度对沉积速率的影响不具单调性,沉积速率随源-衬间距增大、衬底温度升高呈波动起伏.不同条件下制备的PbI2膜均属六方结构,但结晶质量和择优生长晶面存在差异.实验发现,随着膜层厚度增大,样品的结晶质量提高,当膜厚超出某一临界值,其结晶质量出现明显的下降.同时,随着衬底温度升高,PbI2膜的择优生长方向由80 ℃的(110)晶面转变为120 ℃的(001)晶面,且高级次(002)、(003)、(004)晶面的衍射峰逐渐增强,样品的c轴择优取向生长更加明显.综合以上,在电子枪束流25 mA、电压6.5 kV,源-衬间距30 cm、衬底温度160 ℃的条件下,采用电子束蒸发制备的PbI2多晶膜具有最佳的结晶性能.
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