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Title: Thermomechanical Lift-Off and Recontacting of CdTe Solar Cells

Abstract

Controlled delamination of thin-film photovoltaics (PV) post-growth can reveal interfaces that are critical to device performance yet are poorly understood because of their inaccessibility within the device stack. In this work, we demonstrate a technique to lift off thin-film solar cells from their glass substrates in a clean, reproducible manner by first laminating a polymeric backsheet to the device and then thermally shocking the system at low temperatures (T ≤ -30 degrees C). To enable clean delamination of diverse thin-film architectures, a theoretical framework is developed and key process control parameters are identified. Focusing on cadmium telluride (CdTe) devices, we show that the lamination temperature and device architecture control the quality of lift-off, while the rate at which the film stack is removed is controlled by the delamination temperature. Crack-free CdTe devices are removed and successfully recontacted, recovering up to 80% of the original device efficiency. The areal density of these devices is ~0.4 kg m -2, a reduction of over an order of magnitude relative to their initial weight on glass. The framework developed here provides a pathway toward both the development of inexpensive, flexible PV with high specific power and the study of previously buried interfaces in thin-filmmore » architectures.« less

Authors:
 [1];  [2];  [2];  [2];  [2];  [2];  [3];  [2]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States); Colorado School of Mines, Golden, CO (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  3. Colorado School of Mines, Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
United States Department of the Navy, US Office of Naval Research
OSTI Identifier:
1502346
Report Number(s):
NREL/JA-5K00-71596
Journal ID: ISSN 1944-8244
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 10; Journal Issue: 51; Journal ID: ISSN 1944-8244
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; delamination; lift-off; polycrystalline; specific power; thin-film photovoltaics

Citation Formats

McGott, Deborah L., Kempe, Michael D., Glynn, Stephen, Bosco, Nick, Barnes, Teresa M., Haegel, Nancy M., Wolden, Colin A., and Reese, Matthew O. Thermomechanical Lift-Off and Recontacting of CdTe Solar Cells. United States: N. p., 2018. Web. doi:10.1021/acsami.8b16476.
McGott, Deborah L., Kempe, Michael D., Glynn, Stephen, Bosco, Nick, Barnes, Teresa M., Haegel, Nancy M., Wolden, Colin A., & Reese, Matthew O. Thermomechanical Lift-Off and Recontacting of CdTe Solar Cells. United States. doi:10.1021/acsami.8b16476.
McGott, Deborah L., Kempe, Michael D., Glynn, Stephen, Bosco, Nick, Barnes, Teresa M., Haegel, Nancy M., Wolden, Colin A., and Reese, Matthew O. Thu . "Thermomechanical Lift-Off and Recontacting of CdTe Solar Cells". United States. doi:10.1021/acsami.8b16476.
@article{osti_1502346,
title = {Thermomechanical Lift-Off and Recontacting of CdTe Solar Cells},
author = {McGott, Deborah L. and Kempe, Michael D. and Glynn, Stephen and Bosco, Nick and Barnes, Teresa M. and Haegel, Nancy M. and Wolden, Colin A. and Reese, Matthew O.},
abstractNote = {Controlled delamination of thin-film photovoltaics (PV) post-growth can reveal interfaces that are critical to device performance yet are poorly understood because of their inaccessibility within the device stack. In this work, we demonstrate a technique to lift off thin-film solar cells from their glass substrates in a clean, reproducible manner by first laminating a polymeric backsheet to the device and then thermally shocking the system at low temperatures (T ≤ -30 degrees C). To enable clean delamination of diverse thin-film architectures, a theoretical framework is developed and key process control parameters are identified. Focusing on cadmium telluride (CdTe) devices, we show that the lamination temperature and device architecture control the quality of lift-off, while the rate at which the film stack is removed is controlled by the delamination temperature. Crack-free CdTe devices are removed and successfully recontacted, recovering up to 80% of the original device efficiency. The areal density of these devices is ~0.4 kg m-2, a reduction of over an order of magnitude relative to their initial weight on glass. The framework developed here provides a pathway toward both the development of inexpensive, flexible PV with high specific power and the study of previously buried interfaces in thin-film architectures.},
doi = {10.1021/acsami.8b16476},
journal = {ACS Applied Materials and Interfaces},
issn = {1944-8244},
number = 51,
volume = 10,
place = {United States},
year = {2018},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on November 29, 2019
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