Chemical Vapor Deposited Molybdenum Films For Use In Photothermal Conversion'

G. E. Carver; D. D. Allred; B. O. Seraphin

doi:10.1117/12.956873

17 November 1978 Chemical Vapor Deposited Molybdenum Films For Use In Photothermal Conversion'

G. E. Carver, D. D. Allred, B. O. Seraphin

Proceedings Volume 0161, Optics Applied to Solar Energy IV; (1978) https://doi.org/10.1117/12.956873
Event: 22nd Annual Technical Symposium, 1978, San Diego, United States

Abstract

High infrared reflectance, coupled with high solar absorptance, is required for efficient photothermal conversion. Converters can be fabricated by depositing an absorber on a highly reflecting metal. The absorber functions in the visible, yet becomes transparent in the near infrared, allowing the metal to suppress the thermal emittance. Economic considerations demand the use of thin films, rather than bulk materials. The thin film reflector must be capable of withstanding high temperatures of operation. Compatibility of the re-flector with the substrate below, and the absorber above, is required for long-time service. Highly reflective silver films suffer reflectance losses by agglomeration, and require stabilization layers. Refractory materials such as molybdenum avoid agglomeration at temperatures of operation of photothermal converters. Unlike other deposition methods, chemical vapor deposition (CVD) can produce molybdenum films with an infrared reflectance rivaling that of bulk molybdenum. CVD is a non-vacuum based technology with potential for sequential throughput fabrication. Studies are being undertaken to determine how sensitively the reflectance reacts to inclusions of impurities into the molybdenum. Thin film passivators deposited on the molybdenum prevent reflectance losses induced by oxidation, and insure high temperature survival of optimal reflectance. Complete converter stacks have been annealed at 550°C for over 1000 hours in air.

Citation Download Citation

G. E. Carver, D. D. Allred, and B. O. Seraphin "Chemical Vapor Deposited Molybdenum Films For Use In Photothermal Conversion'", Proc. SPIE 0161, Optics Applied to Solar Energy IV, (17 November 1978); https://doi.org/10.1117/12.956873

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available