CdTe-Based Solar Cells with Variations in Mg Concentration in the MgZnO Emitter
Abstract
The optimal fraction of Mg incorporation in sputter‐deposited Mg X Zn 1− X O (MZO) emitters for thin‐film CdTe‐based solar cells is evaluated by varying it over a range of x from 0 to 0.35. This range allows a variation in the conduction band offset from −0.1 eV (cliff like) to +0.32 eV (spike like). A maximum efficiency of 18.5% for cells with the bilayer CdSeTe/CdTe absorber occurs at x = 0.15, which corresponds to a spike‐like band offset near 0.2 eV, as confirmed by X‐ray photoelectron spectroscopy. In addition, good cell performance is seen over a fairly broad range of x extending from 0.1 to 0.25. The MZO optical bandgap increases with the Mg fraction, consistent with an increasing conduction band offset. Temperature‐dependent current−voltage measurements and time‐resolved photoluminescence show improvement in the emitter/absorber interface with the incorporation of Mg. Capacitance−voltage measurements show that the depletion region extends further into the absorber with more Mg, and X‐ray diffraction confirms a change from a hexagonal‐dominant crystal structure toward zinc blende at x = 0.35.
- Authors:
-
- Colorado State Univ., Fort Collins, CO (United States)
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Publication Date:
- Research Org.:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- OSTI Identifier:
- 1782803
- Alternate Identifier(s):
- OSTI ID: 1781239
- Report Number(s):
- NREL/JA-5900-79942
Journal ID: ISSN 2367-198X; MainId:39160;UUID:936ac3c4-171c-4d2e-a533-ab0039af143b;MainAdminID:22444
- Grant/Contract Number:
- AC36-08GO28308
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Solar RRL
- Additional Journal Information:
- Journal Volume: 5; Journal Issue: 7; Journal ID: ISSN 2367-198X
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 14 SOLAR ENERGY; CdTe; MZO; thin-film solar cells
Citation Formats
Pandey, Ramesh, Munshi, Amit, Shimpi, Tushar, Shah, Akash, Bothwell, Alexandra, Kuciauskas, Darius, and Sites, James R. CdTe-Based Solar Cells with Variations in Mg Concentration in the MgZnO Emitter. United States: N. p., 2021.
Web. doi:10.1002/solr.202100126.
Pandey, Ramesh, Munshi, Amit, Shimpi, Tushar, Shah, Akash, Bothwell, Alexandra, Kuciauskas, Darius, & Sites, James R. CdTe-Based Solar Cells with Variations in Mg Concentration in the MgZnO Emitter. United States. https://doi.org/10.1002/solr.202100126
Pandey, Ramesh, Munshi, Amit, Shimpi, Tushar, Shah, Akash, Bothwell, Alexandra, Kuciauskas, Darius, and Sites, James R. Wed .
"CdTe-Based Solar Cells with Variations in Mg Concentration in the MgZnO Emitter". United States. https://doi.org/10.1002/solr.202100126. https://www.osti.gov/servlets/purl/1782803.
@article{osti_1782803,
title = {CdTe-Based Solar Cells with Variations in Mg Concentration in the MgZnO Emitter},
author = {Pandey, Ramesh and Munshi, Amit and Shimpi, Tushar and Shah, Akash and Bothwell, Alexandra and Kuciauskas, Darius and Sites, James R.},
abstractNote = {The optimal fraction of Mg incorporation in sputter‐deposited Mg X Zn 1− X O (MZO) emitters for thin‐film CdTe‐based solar cells is evaluated by varying it over a range of x from 0 to 0.35. This range allows a variation in the conduction band offset from −0.1 eV (cliff like) to +0.32 eV (spike like). A maximum efficiency of 18.5% for cells with the bilayer CdSeTe/CdTe absorber occurs at x = 0.15, which corresponds to a spike‐like band offset near 0.2 eV, as confirmed by X‐ray photoelectron spectroscopy. In addition, good cell performance is seen over a fairly broad range of x extending from 0.1 to 0.25. The MZO optical bandgap increases with the Mg fraction, consistent with an increasing conduction band offset. Temperature‐dependent current−voltage measurements and time‐resolved photoluminescence show improvement in the emitter/absorber interface with the incorporation of Mg. Capacitance−voltage measurements show that the depletion region extends further into the absorber with more Mg, and X‐ray diffraction confirms a change from a hexagonal‐dominant crystal structure toward zinc blende at x = 0.35.},
doi = {10.1002/solr.202100126},
journal = {Solar RRL},
number = 7,
volume = 5,
place = {United States},
year = {Wed Apr 21 00:00:00 EDT 2021},
month = {Wed Apr 21 00:00:00 EDT 2021}
}
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