-Si∶H膜中反常瞬态响应的光谱影响
SPECTRA EFFECTS OF ANOMALOUS TRANSIENT RESPONSE IN -Si:H FILM
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摘要: 测量夹心结构-Si∶H膜的瞬态响应谱时,发现无论是在低的正向偏压还是在低的反向偏压下,起始部分都出现不正常的尖形脉冲,它的幅度随光波长的增长而减小。零场瞬态谱的研究表明,这种不正常的非传输部分来源于结区,它的升降特点决定于光照时的空间电荷限制光电流。从光电流幅值与光吸收系数的关系式,我们发展了一种确定光学隙的方法。
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Abstract: Transient photoresponse spectra in -Si: H film with sandwich structure are measured. It is found that at the starting part of these curves anomalous pulse appears under either a small forward bias or a small reverse one. The pulse amplitude decreases when the light wavelength increases. Analysis of the transient response spectra without bias, showed that this anomalous non-transport component originates from the barrier region. Its rise or deeay characteristic is determined by space-charge-limited photocurents. With the relation between its amplitude and optical absorption, we developed a method to obtain optical band gap of the films studied. -
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