Improving the Cu2ZnSn(S,Se)4-Based Photovoltaic Conversion Efficiency by Back-Contact Modification

Back-contact modification using a 10-nm ZnS layer in CZTSSe-based solar cell can play a crucial role in improving photovoltaic conversion efficiency. An ultrathin layer of ZnS is deposited over Mo-coated soda lime glass substrate before depositing CZTSSe using sputtering. The crystal structure of de...

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Bibliographic Details
Published in:IEEE transactions on electron devices 2021-06, Vol.68 (6), p.2748-2752
Main Authors: Sengar, Brajendra S., Garg, Vivek, Siddharth, Gaurav, Kumar, Amitesh, Pandey, Sushil Kumar, Dubey, Mayank, Atuchin, Victor V., Kumar, Shailendra, Mukherjee, Shaibal
Format: Article
Language:English
Subjects:
Conversion efficiency
Crystal defects
Crystal structure
CZTSSe
Efficiency
Energy conversion efficiency
Glass substrates
II-VI semiconductor materials
Mathematical model
Photonic band gap
Photovoltaic cells
Photovoltaic conversion
Room temperature
Simulation
Soda-lime glass
Solar cells
Spectroellipsometry
Substrates
Thin films
Uninterruptible power systems
Zinc compounds
Zinc sulfide
ZnS back contact
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Summary:Back-contact modification using a 10-nm ZnS layer in CZTSSe-based solar cell can play a crucial role in improving photovoltaic conversion efficiency. An ultrathin layer of ZnS is deposited over Mo-coated soda lime glass substrate before depositing CZTSSe using sputtering. The crystal structure of deposited CZTSSe thin films over ZnS is recognized as (112)-oriented, polycrystalline in nature, and free from the presence of any secondary phases such as Cu 2 (S,Se) or Zn(S,Se). The bandgap of CZTSSe thin films deposited over ultrathin ZnS is observed to increase from 1.49 (deposited over Mo directly) to 1.58 eV at room temperature, as determined by spectroscopic ellipsometry. In addition, numerical simulation has been performed using SCAPS software. The impact of ZnS layer has been simulated by using the defects in the absorber and at the interface of ZnS/CZTSSe. The simulated results have been validated with experimentally fabricated CZTSSe device. Simulated device with ZnS intermediate layer is observed to give rise to a photovoltaic conversion efficiency of 15.2%.
ISSN:0018-9383
1557-9646
DOI:10.1109/TED.2021.3071105