Local vibrational modes of interstitial boron–interstitial oxygen complex in silicon
Local vibrational modes of interstitial boron–interstitial oxygen complex in silicon
复制标题
硅中间隙硼-间隙氧配合物的局部振动模式
DOI：
10.1002/pssa.201600588
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
B. Svensson
中科院分区：
文献类型：
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作者：
L. I. Murin;S. Lastovskii;E. Tolkacheva;V. Markevich;A. Peaker;B. Svensson
在目前的工作中，我们报告了与局域振动模式（LVM）相关的吸收线，这些吸收线被分配给包含间隙硼和间隙氧原子（BiOi）的复合物，BiOi是由硼掺杂富氧硅生产的太阳能电池中负责光致降解（LID）的中心的可能前体。傅里叶变换红外吸收 (IR) 光谱用于检测和分析由于在室温下用 6 或 10MeV 电子照射而在掺硼直拉法生长的 Si 样品中产生的缺陷所产生的吸收线。还监测了 75–225°C 温度范围内辐照样品等时退火时红外吸收光谱的变化。一组先前未报道的具有相同形成和消除行为的 LVM 系已被研究。该组中最强烈的线位于 991、721 和 550 cm−1。根据对线强度随硅中杂质浓度变化的分析，以及它们的退火特征与 BiOi 中心导致的 DLTS 信号的相似性，认为这些线与该缺陷的 LVM 有关。线的位置已与先前报告的 LVM 进行了比较，该 LVM 是从 BiOi 复合物的不同配置的从头开始建模计算得出的。已经找到了计算出的 LVM 接近实验确定的 LVM 的配置，并讨论了模式的起源。
In the present work, we report local vibrational mode (LVM) related absorption lines which are assigned to the complex incorporating interstitial boron and interstitial oxygen atoms (BiOi), a possible precursor of the center responsible for light‐induced degradation (LID) in solar cells produced from boron‐doped oxygen‐rich silicon. Fourier transform infrared absorption (IR) spectroscopy was used for detection and analysis of absorption lines due to defects which were created in boron‐doped Czochralski‐grown Si samples by irradiation with 6 or 10 MeV electrons at room temperature. Changes in the IR absorption spectra upon isochronal annealing of the irradiated samples in the temperature range 75–225 °C have also been monitored. A set of previously unreported LVM lines with the same formation and elimination behavior has been studied. The most intense lines of the set are found to be at 991, 721, and 550 cm−1. On the basis of an analysis of changes in intensity of the lines with the concentrations of impurities in the silicon and on the similarity of their annealing features with those for the DLTS signal due to the BiOi center, it is argued that the lines are related to the LVMs of this defect. The positions of the lines have been compared with the previously reported LVMs derived from ab initio modeling calculations for different configurations of the BiOi complex. A configuration having calculated LVMs close to those determined experimentally has been found and the origins of the modes are discussed.