摘要
掺杂锰氧化物是一种重要功能材料,近来其光电功能特性受到重视。利用对靶溅射方法在n型硅基底上沉积了100 nm的两种镧掺杂锰氧化物薄膜LaxCa1-xMnO3(x=0.4和x=0.67),构成异质结。分别研究了在无光照射、532 nm激光辐照、1064 nm激光辐照、模拟太阳光辐照4种情况下两种异质结的光生伏特效应。对比实验表明,与无光条件下相比,光照下的异质结负向区的整流特性变化明显,而正向导通区的整流曲线变化不大。其中在同样的光功率下,模拟太阳光入射时异质结I-V曲线变化最为明显,此时I-V曲线与坐标轴相交所构成的图形区域的面积也最大,光电转化效率最高,填充因子约为23%。高掺杂的异质结La0.67Ca0.33MnO3/Si的光电转化效率高于低掺杂的异质结La0.4Ca0.6MnO3/Si。对LaxCa1-xMnO3/Si异质结的紫外-可见光电流谱的测量结果表明此类异质结在400～1100 nm波长范围(涵盖整个可见光波段)具有良好的吸收和光电转化,这些特性将有利于探索基于锰酸盐氧化物异质结的新型太阳能电池材料。
Doped manganite was a kind of important function materials, which recently drew many attentions for its photoelectric properties. Manganite oxide heterojunctions of La, Ca1 -xMnO3 （x =0.4 and 0.67） were fabricated by depositing 100 nm LaxCa1-x MnO3 thin films on n-type sihcon substrates using facing target sputtering technique. The current-voltage characteristics of the hetero- junctions were measured by standard four-probe technique with different light illuminations： dark, 532 nm laser irradiation, 1064 nm laser irradiation or simulated sunlight irradiation. The results showed that the current-voltage properties presented obvious changes in the negative bias region with light illuminations. And among the three types of light irradiations which had the same optical power, un- der the simulated sunlight, the sample showed the largest variation of the I-V curve and the highest photoelectric conversion efficiency. The sample of Lao.67Ca0.33Mn03/Si showed higher photoelectric conversion efficiency than the sample of La0.4Ca0.6Mn03/Si. The bet- erojunctions had good absorption among 400 - 1100 nm wavelength range shown by absorption spectrum. All the results would be help- ful for exploring the solar cell material based on manganite oxide heterojunctions.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2013年第2期255-259,共5页
Chinese Journal of Rare Metals
基金
国家教育部新世纪优秀人才支持计划项目(NCET-08-0841)
中国石油大学(北京)基础学科研究基金项目(JCXK-2010-08)
北京市自然科学基金项目(4122064)资助
关键词
镧掺杂
锰酸盐
太阳能电池
异质结
光生伏特效应
lanthanum doped
manganite oxide
solar cell
heterojunction
photovoltaic effect
