Optical absorptions in ZnO/a-Si distributed Bragg reflectors |
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| Authors: | Aqing Chen Zhian Chen Kaigui Zhu Zhenguo Ji |
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| Affiliation: | 1.College of Materials & Environmental Engineering,Hangzhou Dianzi University,Hangzhou,People’s Republic of China;2.Department of physics,Beihang University,Beijing,People’s Republic of China |
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| Abstract: | The distributed Bragg reflectors (DBRs) consisting of alternating layers of ZnO and heavy doped amorphous silicon (a-Si) have been fabricated by magnetron sputtering. It is novel to find that the optical absorptions exist in the stopband of the DBRs, and that many discrete strong optical absorption peaks exist in the wavelength range of visible to near-infrared. The calculated results by FDTD show that the absorptions in the stopband mainly exist in the first a-Si layer, and that the light absorbed by other a-Si layers inside contributes to the two absorption peaks in near-infrared range. The strong absorptions ranged from visible to infrared open new possibilities to the enhancement of the performance of amorphous silicon solar cells. |
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