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Title: High Efficiency Cadmium Telluride and Zinc Telluride Based Thin-Film Solar Cells, Annual Subcontract Report, 1 March 1990 - 28 Februawry 1992

Abstract

This report describes work to improve the basic understanding of CdTe and ZnTe alloys by growing and characterizing these films along with cell fabrication. The major objective was to develop wide-band-gap (1.6--1.8 eV) material for the top cell, along with compatible window material and transparent ohmic contacts, so that a cascade cell design can be optimized. Front-wall solar cells were fabricated with a glass/SnO{sub 2}/CdS window, where the CdS film is thin to maximize transmission and current. Wide-band-gap absorber films (E{sub g} = 1.75 eV) were grown by molecular beam epitaxy (MBE) and metal-organic chemical vapor deposition (MOCVD) techniques, which provided excellent control for tailoring the film composition and properties. CdZnTe films were grown by both MBE and MOCVD. All the as-grown films were characterized by several techniques (surface photovoltage spectroscopy, Auger electron spectroscopy (AES), and x-ray photoelectron spectroscopy (XPS)) for composition, bulk uniformity, thickness, and film and interface quality. Front-wall-type solar cells were fabricated in collaboration with Ametek Materials Research Laboratory using CdTe and CdZnTe polycrystalline absorber films. The effects of processing on ternary film were studied by AES and XPS coupled with capacitance voltage and current voltage measurements as a function of temperature. Bias-dependent spectral response and electricalmore » measurements were used to test some models in order to identify and quantify dominant loss mechanisms.« less

Authors:
; ; ;
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
7004274
Report Number(s):
NREL/TP-451-4999
ON: DE92016403
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; CADMIUM SULFIDE SOLAR CELLS; RESEARCH PROGRAMS; CADMIUM TELLURIDE SOLAR CELLS; SOLAR CELLS; AUGER ELECTRON SPECTROSCOPY; CHEMICAL VAPOR DEPOSITION; ELECTRICAL PROPERTIES; FABRICATION; MOLECULAR BEAM EPITAXY; PHOTOELECTRON SPECTROSCOPY; PROGRESS REPORT; TEMPERATURE DEPENDENCE; THIN FILMS; ZINC TELLURIDES; CHALCOGENIDES; CHEMICAL COATING; DEPOSITION; DIRECT ENERGY CONVERTERS; DOCUMENT TYPES; ELECTRON SPECTROSCOPY; EPITAXY; EQUIPMENT; FILMS; PHOTOELECTRIC CELLS; PHOTOVOLTAIC CELLS; PHYSICAL PROPERTIES; SOLAR EQUIPMENT; SPECTROSCOPY; SURFACE COATING; TELLURIDES; TELLURIUM COMPOUNDS; ZINC COMPOUNDS; photovoltaics; solar cells; high efficiency; cadmium telluride; zinc telluride; thin films; 140501* - Solar Energy Conversion- Photovoltaic Conversion; 360601 - Other Materials- Preparation & Manufacture

Citation Formats

Rohatgi, A., Sudharsanan, R., Ringel, S. A., and Chou, H. C. High Efficiency Cadmium Telluride and Zinc Telluride Based Thin-Film Solar Cells, Annual Subcontract Report, 1 March 1990 - 28 Februawry 1992. United States: N. p., 1992. Web. doi:10.2172/7004274.
Rohatgi, A., Sudharsanan, R., Ringel, S. A., & Chou, H. C. High Efficiency Cadmium Telluride and Zinc Telluride Based Thin-Film Solar Cells, Annual Subcontract Report, 1 March 1990 - 28 Februawry 1992. United States. https://doi.org/10.2172/7004274
Rohatgi, A., Sudharsanan, R., Ringel, S. A., and Chou, H. C. 1992. "High Efficiency Cadmium Telluride and Zinc Telluride Based Thin-Film Solar Cells, Annual Subcontract Report, 1 March 1990 - 28 Februawry 1992". United States. https://doi.org/10.2172/7004274. https://www.osti.gov/servlets/purl/7004274.
@article{osti_7004274,
title = {High Efficiency Cadmium Telluride and Zinc Telluride Based Thin-Film Solar Cells, Annual Subcontract Report, 1 March 1990 - 28 Februawry 1992},
author = {Rohatgi, A. and Sudharsanan, R. and Ringel, S. A. and Chou, H. C.},
abstractNote = {This report describes work to improve the basic understanding of CdTe and ZnTe alloys by growing and characterizing these films along with cell fabrication. The major objective was to develop wide-band-gap (1.6--1.8 eV) material for the top cell, along with compatible window material and transparent ohmic contacts, so that a cascade cell design can be optimized. Front-wall solar cells were fabricated with a glass/SnO{sub 2}/CdS window, where the CdS film is thin to maximize transmission and current. Wide-band-gap absorber films (E{sub g} = 1.75 eV) were grown by molecular beam epitaxy (MBE) and metal-organic chemical vapor deposition (MOCVD) techniques, which provided excellent control for tailoring the film composition and properties. CdZnTe films were grown by both MBE and MOCVD. All the as-grown films were characterized by several techniques (surface photovoltage spectroscopy, Auger electron spectroscopy (AES), and x-ray photoelectron spectroscopy (XPS)) for composition, bulk uniformity, thickness, and film and interface quality. Front-wall-type solar cells were fabricated in collaboration with Ametek Materials Research Laboratory using CdTe and CdZnTe polycrystalline absorber films. The effects of processing on ternary film were studied by AES and XPS coupled with capacitance voltage and current voltage measurements as a function of temperature. Bias-dependent spectral response and electrical measurements were used to test some models in order to identify and quantify dominant loss mechanisms.},
doi = {10.2172/7004274},
url = {https://www.osti.gov/biblio/7004274}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Oct 01 00:00:00 EDT 1992},
month = {Thu Oct 01 00:00:00 EDT 1992}
}