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Improving the Cu2ZnSn(S,Se)4-Based Photovoltaic Conversion Efficiency by Back-Contact Modification
- Source :
- IEEE Transactions on Electron Devices. 68:2748-2752
- Publication Year :
- 2021
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2021.
-
Abstract
- 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 Cu2(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%.
- Subjects :
- 010302 applied physics
Soda-lime glass
Materials science
business.industry
Band gap
Substrate (electronics)
01 natural sciences
Electronic, Optical and Magnetic Materials
law.invention
Sputtering
law
0103 physical sciences
Solar cell
Optoelectronics
Crystallite
Electrical and Electronic Engineering
Thin film
business
Layer (electronics)
Subjects
Details
- ISSN :
- 15579646 and 00189383
- Volume :
- 68
- Database :
- OpenAIRE
- Journal :
- IEEE Transactions on Electron Devices
- Accession number :
- edsair.doi...........ea7a86d6c0ef8998ac4baf07ee1c6a27