Direct imaging of Cl- and Cu-induced short-circuit efficiency changes in CdTe solar cells
Abstract
To achieve high-efficiency polycrystalline CdTe-based thin-film solar cells, the CdTe absorbers must go through a post-deposition CdCl2 heat treatment followed by a Cu diffusion step. To better understand the roles of each treatment with regard to improving grains, grain boundaries, and interfaces, CdTe solar cells with and without Cu diffusion and CdCl2 heat treatments are investigated using cross-sectional electron beam induced current, electron backscatter diffraction, and scanning transmission electron microscope techniques. The evolution of the cross-sectional carrier collection profile due to these treatments that cause an increase in short-circuit current and higher open-circuit voltage are identified. Additionally, an increased carrier collection in grain boundaries after either/both of these treatments is revealed. The increased current at the grain boundaries is shown to be due to the presence of a space charge region with an intrinsic carrier collection profile width of ≈350 nm. Scanning transmission electron microscope electron-energy loss spectroscopy shows a decreased Te and increased Cl concentration in grain boundaries after treatment, which causes the inversion. Furthermore, each treatment improves the overall carrier collection efficiency of the cell separately, and, therefore, the benefits realized by each treatment are shown to be independent of each other.
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Vanderbilt Univ., Nashville, TN (United States)
- Univ. of Toledo, Toledo, OH (United States)
- Univ. of Tennessee, Knoxville, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1185383
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Advanced Energy Materials
- Additional Journal Information:
- Journal Volume: 4; Journal Issue: 15; Journal ID: ISSN 1614-6832
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 14 SOLAR ENERGY; photovoltaic devices; solar cells; thin films
Citation Formats
Poplawsky, Jonathan D., Parish, Chad M., Leonard, Donovan N., Li, Chen, Paudel, Naba, Yan, Yanfa, and Pennycook, Stephen J. Direct imaging of Cl- and Cu-induced short-circuit efficiency changes in CdTe solar cells. United States: N. p., 2014.
Web. doi:10.1002/aenm.201400454.
Poplawsky, Jonathan D., Parish, Chad M., Leonard, Donovan N., Li, Chen, Paudel, Naba, Yan, Yanfa, & Pennycook, Stephen J. Direct imaging of Cl- and Cu-induced short-circuit efficiency changes in CdTe solar cells. United States. https://doi.org/10.1002/aenm.201400454
Poplawsky, Jonathan D., Parish, Chad M., Leonard, Donovan N., Li, Chen, Paudel, Naba, Yan, Yanfa, and Pennycook, Stephen J. Fri .
"Direct imaging of Cl- and Cu-induced short-circuit efficiency changes in CdTe solar cells". United States. https://doi.org/10.1002/aenm.201400454. https://www.osti.gov/servlets/purl/1185383.
@article{osti_1185383,
title = {Direct imaging of Cl- and Cu-induced short-circuit efficiency changes in CdTe solar cells},
author = {Poplawsky, Jonathan D. and Parish, Chad M. and Leonard, Donovan N. and Li, Chen and Paudel, Naba and Yan, Yanfa and Pennycook, Stephen J.},
abstractNote = {To achieve high-efficiency polycrystalline CdTe-based thin-film solar cells, the CdTe absorbers must go through a post-deposition CdCl2 heat treatment followed by a Cu diffusion step. To better understand the roles of each treatment with regard to improving grains, grain boundaries, and interfaces, CdTe solar cells with and without Cu diffusion and CdCl2 heat treatments are investigated using cross-sectional electron beam induced current, electron backscatter diffraction, and scanning transmission electron microscope techniques. The evolution of the cross-sectional carrier collection profile due to these treatments that cause an increase in short-circuit current and higher open-circuit voltage are identified. Additionally, an increased carrier collection in grain boundaries after either/both of these treatments is revealed. The increased current at the grain boundaries is shown to be due to the presence of a space charge region with an intrinsic carrier collection profile width of ≈350 nm. Scanning transmission electron microscope electron-energy loss spectroscopy shows a decreased Te and increased Cl concentration in grain boundaries after treatment, which causes the inversion. Furthermore, each treatment improves the overall carrier collection efficiency of the cell separately, and, therefore, the benefits realized by each treatment are shown to be independent of each other.},
doi = {10.1002/aenm.201400454},
journal = {Advanced Energy Materials},
number = 15,
volume = 4,
place = {United States},
year = {Fri May 30 00:00:00 EDT 2014},
month = {Fri May 30 00:00:00 EDT 2014}
}
Web of Science
Works referenced in this record:
From atomic structure to photovoltaic properties in CdTe solar cells
journal, November 2013
- Li, Chen; Poplawsky, Jonathan; Wu, Yelong
- Ultramicroscopy, Vol. 134
Tailoring Impurity Distribution in Polycrystalline CdTe Solar Cells for Enhanced Minority Carrier Lifetime
journal, November 2013
- Kranz, Lukas; Gretener, Christina; Perrenoud, Julian
- Advanced Energy Materials, Vol. 4, Issue 7
How Polycrystalline Devices Can Outperform Single-Crystal Ones: Thin Film CdTe/CdS Solar Cells
journal, June 2004
- Visoly-Fisher, I.; Cohen, S. R.; Ruzin, A.
- Advanced Materials, Vol. 16, Issue 11
Solar cell efficiency tables (version 42): Solar cell efficiency tables
journal, July 2013
- Green, Martin A.; Emery, Keith; Hishikawa, Yoshihiro
- Progress in Photovoltaics: Research and Applications, Vol. 21, Issue 5
Grain-Boundary-Enhanced Carrier Collection in CdTe Solar Cells
journal, April 2014
- Li, Chen; Wu, Yelong; Poplawsky, Jonathan
- Physical Review Letters, Vol. 112, Issue 15
Passivation of double-positioning twin boundaries in CdTe
journal, July 2004
- Yan, Yanfa; Al-Jassim, M. M.; Jones, K. M.
- Journal of Applied Physics, Vol. 96, Issue 1
Chlorine-doped CdS thin films from CdCl2-mixed CdS powder
journal, February 2004
- Abu-Safe, Husam H.; Hossain, Marouf; Naseem, Hameed
- Journal of Electronic Materials, Vol. 33, Issue 2
Quantitative analysis of electron‐beam‐induced current profiles across p–n junctions in GaAs/Al0.4Ga0.6As heterostructures
journal, May 1996
- Bonard, Jean‐Marc; Ganière, Jean‐Daniel
- Journal of Applied Physics, Vol. 79, Issue 9
Copper migration in cdte heterojunction solar cells
journal, July 1996
- Chou, H. C.; Rohatgi, A.; Jokerst, N. M.
- Journal of Electronic Materials, Vol. 25, Issue 7
Understanding the Beneficial Role of Grain Boundaries in Polycrystalline Solar Cells from Single-Grain-Boundary Scanning Probe Microscopy
journal, March 2006
- Visoly-Fisher, I.; Cohen, S. R.; Gartsman, K.
- Advanced Functional Materials, Vol. 16, Issue 5
Diffusion and influence of Cu on properties of CdTe thin films and CdTe/CdS cells
journal, January 2005
- Dzhafarov, T. D.; Yesilkaya, S. S.; Yilmaz Canli, N.
- Solar Energy Materials and Solar Cells, Vol. 85, Issue 3
Direct evidence for grain-boundary depletion in polycrystalline CdTe from nanoscale-resolved measurements
journal, January 2003
- Visoly-Fisher, Iris; Cohen, Sidney R.; Cahen, David
- Applied Physics Letters, Vol. 82, Issue 4
Stability of CdTe/CdS thin-film solar cells
journal, May 2000
- Dobson, Kevin D.; Visoly-Fisher, Iris; Hodes, Gary
- Solar Energy Materials and Solar Cells, Vol. 62, Issue 3
A comparative EBIC study of CdTe solar cell activation using CdCl2 and Cl2
journal, May 2001
- Edwards, P. R.; Durose, K.; Beier, J.
- Thin Solid Films, Vol. 387, Issue 1-2
Effect of Copassivation of Cl and Cu on CdTe Grain Boundaries
journal, October 2008
- Zhang, Lixin; Da Silva, Juarez L. F.; Li, Jingbo
- Physical Review Letters, Vol. 101, Issue 15
Analysis of Bulk and Interface Phenomena in CdTe/CdS Thin-Film Solar Cells
journal, April 2004
- Terheggen, M.; Heinrich, H.; Kostorz, G.
- Interface Science, Vol. 12, Issue 2/3
Detailed Investigation of Surface Passivation Methods for Lifetime Measurements on P-Type Silicon Wafers
journal, January 2012
- Pollock, Kevin L.; Junge, Johannes; Hahn, Giso
- IEEE Journal of Photovoltaics, Vol. 2, Issue 1
Radiative efficiency of state-of-the-art photovoltaic cells
journal, September 2011
- Green, Martin A.
- Progress in Photovoltaics: Research and Applications, Vol. 20, Issue 4, p. 472-476
Characterization of extended defects in polycrystalline CdTe thin films grown by close-spaced sublimation
journal, June 2001
- Yan, Yanfa; Al-Jassim, M. M.; Jones, K. M.
- Thin Solid Films, Vol. 389, Issue 1-2
Development of Cu‐doped ZnTe as a back‐contact interface layer for thin‐film CdS/CdTe solar cells
journal, May 1996
- Gessert, T. A.; Mason, A. R.; Sheldon, P.
- Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, Vol. 14, Issue 3
SRIM – The stopping and range of ions in matter (2010)
journal, June 2010
- Ziegler, James F.; Ziegler, M. D.; Biersack, J. P.
- Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 268, Issue 11-12
Fabrication and characterization of high-efficiency CdTe-based thin-film solar cells on commercial SnO2:F-coated soda-lime glass substrates
journal, December 2013
- Paudel, Naba R.; Yan, Yanfa
- Thin Solid Films, Vol. 549
Phase control of CuxTe film and its effects on CdS/CdTe solar cell
journal, May 2007
- Wu, X.; Zhou, J.; Duda, A.
- Thin Solid Films, Vol. 515, Issue 15
Detailed Balance Limit of Efficiency of p‐n Junction Solar Cells
journal, March 1961
- Shockley, William; Queisser, Hans J.
- Journal of Applied Physics, Vol. 32, Issue 3, p. 510-519
Grain-boundary recombination in Cu(In,Ga)Se2 solar cells
journal, December 2005
- Gloeckler, Markus; Sites, James R.; Metzger, Wyatt K.
- Journal of Applied Physics, Vol. 98, Issue 11
Effect of chlorine activation treatment on electron beam induced current signal distribution of cadmium telluride thin film solar cells
journal, October 2013
- Zywitzki, Olaf; Modes, Thomas; Morgner, Henry
- Journal of Applied Physics, Vol. 114, Issue 16
Low Energy Ga+ and Ar+ Ion Milling for Improved EBSD Sample Preparation
journal, August 2008
- Michael, Jr; Kotula, Pg
- Microscopy and Microanalysis, Vol. 14, Issue S2
Doping of polycrystalline CdTe for high-efficiency solar cells on flexible metal foil
journal, August 2013
- Kranz, Lukas; Gretener, Christina; Perrenoud, Julian
- Nature Communications, Vol. 4, Issue 1
Research strategies toward improving thin-film CdTe photovoltaic devices beyond 20% conversion efficiency
journal, December 2013
- Gessert, T. A.; Wei, S.-H.; Ma, J.
- Solar Energy Materials and Solar Cells, Vol. 119, p. 149-155
EBIC and IBIC Imaging on Polycrystalline CdTe
journal, June 2007
- Baier, Nicolas; Brambilla, Andrea; Feuillet, Guy
- Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 576, Issue 1
Local electrical characterization of cadmium telluride solar cells using low-energy electron beam
journal, October 2013
- Yoon, Heayoung P.; Haney, Paul M.; Ruzmetov, Dmitry
- Solar Energy Materials and Solar Cells, Vol. 117
The impact of charged grain boundaries on thin-film solar cells and characterization
journal, September 2005
- Metzger, W. K.; Gloeckler, M.
- Journal of Applied Physics, Vol. 98, Issue 6
CdCl2 treatment, S diffusion, and recombination in polycrystalline CdTe
journal, May 2006
- Metzger, W. K.; Albin, D.; Romero, M. J.
- Journal of Applied Physics, Vol. 99, Issue 10
Electron penetration and energy transfer in solid targets
journal, September 1977
- Fitting, H. -J.; Glaefeke, H.; Wild, W.
- Physica Status Solidi (a), Vol. 43, Issue 1
Electronically active layers and interfaces in polycrystalline devices: Cross-section mapping of CdS/CdTe solar cells
journal, December 2003
- Visoly-Fisher, Iris; Cohen, Sidney R.; Cahen, David
- Applied Physics Letters, Vol. 83, Issue 24
Works referencing / citing this record:
Understanding Detrimental and Beneficial Grain Boundary Effects in Halide Perovskites
journal, October 2018
- Adhyaksa, Gede W. P.; Brittman, Sarah; Āboliņš, Haralds
- Advanced Materials, Vol. 30, Issue 52
Applications of Phosphorene and Black Phosphorus in Energy Conversion and Storage Devices
journal, December 2017
- Pang, Jinbo; Bachmatiuk, Alicja; Yin, Yin
- Advanced Energy Materials, Vol. 8, Issue 8
Obtaining Large Columnar CdTe Grains and Long Lifetime on Nanocrystalline CdSe, MgZnO, or CdS Layers
journal, January 2018
- Amarasinghe, Mahisha; Colegrove, Eric; Moseley, John
- Advanced Energy Materials, Vol. 8, Issue 11
Electron‐Beam‐Related Studies of Halide Perovskites: Challenges and Opportunities
journal, February 2020
- Ran, Junhui; Dyck, Ondrej; Wang, Xiaozheng
- Advanced Energy Materials, Vol. 10, Issue 26
In-depth analysis of chloride treatments for thin-film CdTe solar cells
journal, October 2016
- Major, J. D.; Al Turkestani, M.; Bowen, L.
- Nature Communications, Vol. 7, Issue 1
CdTe solar cells with open-circuit voltage breaking the 1 V barrier
journal, February 2016
- Burst, J. M.; Duenow, J. N.; Albin, D. S.
- Nature Energy, Vol. 1, Issue 3
Charge transport in CdTe solar cells revealed by conductive tomographic atomic force microscopy
journal, September 2016
- Luria, Justin; Kutes, Yasemin; Moore, Andrew
- Nature Energy, Vol. 1, Issue 11
Direct evidence for grain boundary passivation in Cu(In,Ga)Se2 solar cells through alkali-fluoride post-deposition treatments
journal, September 2019
- Nicoara, Nicoleta; Manaligod, Roby; Jackson, Philip
- Nature Communications, Vol. 10, Issue 1
Point defect engineering in thin-film solar cells
journal, June 2018
- Park, Ji Sang; Kim, Sunghyun; Xie, Zijuan
- Nature Reviews Materials, Vol. 3, Issue 7
Effect of the KF post-deposition treatment on grain boundary properties in Cu(In, Ga)Se2 thin films
journal, January 2017
- Nicoara, N.; Lepetit, Th.; Arzel, L.
- Scientific Reports, Vol. 7, Issue 1
Recombination by grain-boundary type in CdTe
journal, July 2015
- Moseley, John; Metzger, Wyatt K.; Moutinho, Helio R.
- Journal of Applied Physics, Vol. 118, Issue 2
Direct observation of electrical properties of grain boundaries in sputter-deposited CdTe using scan-probe microwave reflectivity based capacitance measurements
journal, October 2015
- Tuteja, Mohit; Koirala, Prakash; MacLaren, Scott
- Applied Physics Letters, Vol. 107, Issue 14
Quantitative determination of optical and recombination losses in thin-film photovoltaic devices based on external quantum efficiency analysis
journal, August 2016
- Nakane, Akihiro; Tampo, Hitoshi; Tamakoshi, Masato
- Journal of Applied Physics, Vol. 120, Issue 6
Grain boundaries in CdTe thin film solar cells: a review
journal, July 2016
- Major, Jonathan D.
- Semiconductor Science and Technology, Vol. 31, Issue 9
Direct AFM-based nanoscale mapping and tomography of open-circuit voltages for photovoltaics
journal, January 2018
- Atamanuk, Katherine; Luria, Justin; Huey, Bryan D.
- Beilstein Journal of Nanotechnology, Vol. 9
Direct AFM-based nanoscale mapping and tomography of open-circuit voltages for photovoltaics
journal, January 2018
- Atamanuk, Katherine; Luria, Justin; Huey, Bryan D.
- Beilstein Journal of Nanotechnology, Vol. 9