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Enhancement in electrical performance of thin-film silicon solar cells based on a micro- and nano-textured zinc oxide electrodes.
- Source :
-
Applied Energy . Dec2014, Vol. 135, p158-164. 7p. - Publication Year :
- 2014
-
Abstract
- Boron-doped ZnO (BZO) films deposited by metal organic chemical vapor deposition (MOCVD) generally act as transparent conductive oxide films in hydrogenated amorphous silicon (a-Si:H) solar cells and exhibit a high external quantum efficiency (EQE) performance in the short-wavelength region. They, therefore, facilitate efficient use of sunlight in solar cells. However, sharp surface features on the BZO film may result in nano-cracks and voids in the cells. In this study, we devised a process for modifying these sharp features. The BZO films were smoothened by performing a sputtering hydrogen-doped ZnO (HZO) layer using a magnetron sputtering system. The a-Si:H solar cells based on BZO films subjected to this treatment exhibited a higher open-circuit voltage ( V oc ), fill factor ( FF ), and efficiency; however, their short-circuit current density ( J sc ) decreased slightly. In an attempt to increase the J sc while maintaining a high electrical performance for the solar cells, we deposited an additional thin BZO film on the sputter-treated one to realize a micro- and nano-textured structure. This strategy succeeded in increasing J sc and also caused a further improvement in the V oc , FF , and efficiency. As a result, over 10% efficiency of a-Si:H solar cells based on BZO electrodes with a micro- and nano-textured structure was achieved. Moreover, the thickness of the cell is only 300 nm. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03062619
- Volume :
- 135
- Database :
- Academic Search Index
- Journal :
- Applied Energy
- Publication Type :
- Academic Journal
- Accession number :
- 99230520
- Full Text :
- https://doi.org/10.1016/j.apenergy.2014.08.097