skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: The Effect of Dopant Concentration and Annealing Treatments on N-Type Iodine Doped CdTe

Journal Article · · Journal of Alloys and Compounds

We report properties of highly conducting n-type cadmium telluride single crystals doped with iodine (CdTe:I). These crystals were grown with dopant concentrations in the range of 10^17 cm-3 to 10^19 cm-3 by Modified Vertical Bridgman (MVB) melt growth. Post-growth dopant activation, including Cd annealing, Te annealing, and rapid thermal annealing (RTA), was applied to improve free carrier density. The structural, optical, and electrical properties were analyzed by Glow Discharge Mass Spectroscopy (GDMS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Photoluminescence Spectroscopy (PL), optical absorption, Hall measurements, Capacitance-Voltage (CV) measurements, and time-resolved photoluminescence (TRPL). The results indicate that Cd annealing is the most effective activation method to get 100% donor activation (n is approximately 2 x 10^18 cm-3), which is close to the room temperature solubility limit of iodine. This leads to the lowest resistivity and the highest mobility. Moreover, this data suggests a potential role of Cd vacancy-related defects on electrical self-compensation.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office
DOE Contract Number:
AC36-08GO28308
OSTI ID:
1985629
Report Number(s):
NREL/JA-5K00-85337; MainId:86110; UUID:a969cff1-dc90-4487-86c0-a031e8d973dd; MainAdminID:69781
Journal Information:
Journal of Alloys and Compounds, Vol. 960
Country of Publication:
United States
Language:
English

References (49)

Thin-film CdTe photovoltaics – The technology for utility scale sustainable energy generation journal October 2018
Homojunction and heterojunction based on CdTe polycrystalline thin films journal October 2009
Solar cell efficiency tables (version 57) journal November 2020
CdTe-Based Thin Film Solar Cells: Past, Present and Future journal March 2021
High-efficiency polycrystalline CdTe thin-film solar cells journal December 2004
Sputtered indium-tin oxide/cadmium telluride junctions and cadmium telluride surfaces journal January 1980
Thin‐film junctions of cadmium telluride by metalorganic chemical vapor deposition journal April 1992
Electron and hole diffusion length investigation in CdTe thin films by SPV method journal December 1982
Single-Crystal CdTe Homojunction Structures for Solar Cell Applications journal May 2015
Electric and photovoltaic properties of CdTe pn homojunctions journal February 1979
Multisegment CdTe nanowire homojunction photodiode journal February 2010
Optimize parameters of new fabricated n-CdTe/p-CdTe solar cell conference May 2017
Identification of the chlorine A center in CdTe journal March 1992
The diffusion of chlorine in CdTe journal October 1984
Self-compensation in chlorine-doped CdTe journal June 2019
Investigation of Photoexcitation Energy Impact on Electron Mobility in Single Crystalline CdTe journal July 2021
Impurity doping and compensation mechanisms in CdTe journal May 2001
Chemical trends of defect formation and doping limit in II-VI semiconductors: The case of CdTe journal October 2002
Iodine Doping of CdTe and CdMgTe for Photovoltaic Applications journal June 2017
Molecular beam epitaxy of iodine-doped CdTe and (CdMg) Te journal August 1994
Self-compensation in halogen doped CdTe grown by molecular beam epitaxy journal April 1996
Modified vertical bridgman growth of Cd1−xZnxTe detector grade crystal in a 4 inch EDG furnace
  • Datta, A.; Jones, K. A.; Swain, S.
  • 2009 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC 2009), 2009 IEEE Nuclear Science Symposium Conference Record (NSS/MIC) https://doi.org/10.1109/NSSMIC.2009.5402202
conference October 2009
Experimental studies on control of growth interface in MVB grown CdZnTe and its consequences conference October 2011
A modified vertical Bridgman method for growth of high-quality Cd1−xZnxTe crystals journal September 2005
Bulk growth of uniform and near stoichiometric cadmium telluride journal March 2014
Fabrication of single-crystal solar cells from phosphorous-doped CdTe wafer
  • Ablekim, Tursun; Swain, Santosh K.; Kuciauskas, Darius
  • 2015 IEEE 42nd Photovoltaic Specialists Conference (PVSC), 2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC) https://doi.org/10.1109/PVSC.2015.7356372
conference June 2015
Cl-Doped CdTe Crystal Growth for Medical Imaging Applications journal September 2022
Study on temperature dependent resistivity of indium-doped cadmium zinc telluride journal December 2008
Chlorine activated stacking fault removal mechanism in thin film CdTe solar cells: the missing piece journal August 2021
Impact of CdCl2 Treatment in CdTe Thin Film Grown on Ultra-Thin Glass Substrate via Close Spaced Sublimation journal April 2021
Study of MgCl 2 activation treatment on the defects of CdTe solar cells by capacitance-voltage, drive level capacitance profiling and admittance spectroscopy techniques journal July 2017
Reduction of Inclusions in (CdZn)Te and CdTe:In Single Crystals by Post-Growth Annealing journal May 2008
Shallow donors in CdTe journal June 1990
Dependence of the Minority-Carrier Lifetime on the Stoichiometry of CdTe Using Time-Resolved Photoluminescence and First-Principles Calculations journal August 2013
p-type doping efficiency in CdTe: Influence of second phase formation journal April 2018
Approach to Defect-Free Lifetime and High Electron Density in CdTe journal April 2019
Simultaneous Measurement of Minority-Carrier Lifetime in Single-Crystal CdTe Using Three Transient Decay Techniques journal September 2014
Structural, optical and porosity properties of CdI2 thin film journal January 2016
Photoluminescence of CdTe: A comparison of bulk and epitaxial material
  • Giles‐Taylor, N. C.; Bicknell, R. N.; Blanks, D. K.
  • Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, Vol. 3, Issue 1 https://doi.org/10.1116/1.573250
journal January 1985
Study of dopant-dependent band gap narrowing in compound semiconductor devices journal December 1999
On the accurate determination of absorption coefficient from reflectanceand transmittance measurements: Application to Fe-doped GaN
  • Look, David C.; Leach, Jacob H.
  • Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phenomena, Vol. 34, Issue 4 https://doi.org/10.1116/1.4954211
journal July 2016
Variations in photovoltaic parameters of CdTe/CdS thin film solar cells by changing the substrate for the deposition of CdS window layer journal October 2020
Bandgaps of cadmium telluride sintered film journal November 1999
Is the Cu/Zn Disorder the Main Culprit for the Voltage Deficit in Kesterite Solar Cells? journal March 2016
Point defects in CdTe journal September 2003
Donor‐acceptor pair luminescence involving the iodineAcenter in CdTe journal November 1995
Defect levels in d-electron containing systems: Comparative study of CdTe using LDA and LDA + U journal October 2020
The nature of point defects in CdTe journal June 2006
Point defect engineering in thin-film solar cells journal June 2018