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Title: Process Development for High Voc CdTe Solar Cells: Phase I, Annual Technical Report, October 2005 - September 2006

Abstract

The focus of this project is the open-circuit voltage of the CdTe thin-film solar cell. CdTe continues to be one of the leading materials for large-scale cost-effective production of photovoltaics, but the efficiency of the CdTe solar cell has been stagnant for the last few years. At the manufacturing front, the CdTe technology is fast paced and moving forward with U.S.-based First Solar LLC leading the world in CdTe module production. To support the industry efforts and continue the advancement of this technology, it will be necessary to continue improvements in solar cell efficiency. A closer look at the state-of-the-art performance levels puts the three solar cell efficiency parameters of short-circuit current density (JSC), open-circuit voltage (VOC), and fill factor (FF) in the 24-26 mA/cm2, 844?850 mV, and 74%-76% ranges respectively. During the late 1090s, efforts to improve cell efficiency were primarily concerned with increasing JSC, simply by using thinner CdS window layers to enhance the blue response (<510 nm) of the CdTe cell. These efforts led to underscoring the important role 'buffers' (or high-resistivity transparent films) play in CdTe cells. The use of transparent bi-layers (low-p/high-p) as the front contact is becoming a 'standard' feature of the CdTe cell.

Authors:
;
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
903078
Report Number(s):
NREL/SR-520-41525
NDJ-2-30630-18; TRN: US200720%%185
DOE Contract Number:
AC36-99-GO10337
Resource Type:
Technical Report
Resource Relation:
Related Information: Work performed by University of South Florida, Tampa, Florida
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; BUFFERS; CURRENT DENSITY; EFFICIENCY; ELECTRIC POTENTIAL; FILL FACTORS; MANUFACTURING; ORGANIC COMPOUNDS; PERFORMANCE; PRODUCTION; SOLAR CELLS; VOLATILE MATTER; PV; OPEN-CIRCUIT VOLTAGE; THIN FILM; MANUFACTURER; SHORT-CIRCUIT CURRENT DENSITY; FILL FACTOR; HIGH RESISTIVITY TRANSPARENT FILMS; CADMIUM TELLURIDE (CDTE); CONVERSION EFFICIENCY; Solar Energy - Photovoltaics

Citation Formats

Ferekides, C. S., and Morel, D. L. Process Development for High Voc CdTe Solar Cells: Phase I, Annual Technical Report, October 2005 - September 2006. United States: N. p., 2007. Web. doi:10.2172/903078.
Ferekides, C. S., & Morel, D. L. Process Development for High Voc CdTe Solar Cells: Phase I, Annual Technical Report, October 2005 - September 2006. United States. doi:10.2172/903078.
Ferekides, C. S., and Morel, D. L. Sun . "Process Development for High Voc CdTe Solar Cells: Phase I, Annual Technical Report, October 2005 - September 2006". United States. doi:10.2172/903078. https://www.osti.gov/servlets/purl/903078.
@article{osti_903078,
title = {Process Development for High Voc CdTe Solar Cells: Phase I, Annual Technical Report, October 2005 - September 2006},
author = {Ferekides, C. S. and Morel, D. L.},
abstractNote = {The focus of this project is the open-circuit voltage of the CdTe thin-film solar cell. CdTe continues to be one of the leading materials for large-scale cost-effective production of photovoltaics, but the efficiency of the CdTe solar cell has been stagnant for the last few years. At the manufacturing front, the CdTe technology is fast paced and moving forward with U.S.-based First Solar LLC leading the world in CdTe module production. To support the industry efforts and continue the advancement of this technology, it will be necessary to continue improvements in solar cell efficiency. A closer look at the state-of-the-art performance levels puts the three solar cell efficiency parameters of short-circuit current density (JSC), open-circuit voltage (VOC), and fill factor (FF) in the 24-26 mA/cm2, 844?850 mV, and 74%-76% ranges respectively. During the late 1090s, efforts to improve cell efficiency were primarily concerned with increasing JSC, simply by using thinner CdS window layers to enhance the blue response (<510 nm) of the CdTe cell. These efforts led to underscoring the important role 'buffers' (or high-resistivity transparent films) play in CdTe cells. The use of transparent bi-layers (low-p/high-p) as the front contact is becoming a 'standard' feature of the CdTe cell.},
doi = {10.2172/903078},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Apr 01 00:00:00 EDT 2007},
month = {Sun Apr 01 00:00:00 EDT 2007}
}

Technical Report:

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