The Merits of Sol-Gel Processing for Electrochromic Windows: A Commercial Perspective

Chapter
Part of the Advances in Sol-Gel Derived Materials and Technologies book series (Adv.Sol-Gel Deriv. Materials Technol.)

Abstract

Electrochromic windows are reversible electrochemical devices. For architectural windows, typical electrochromic device structures comprise of several layers of coatings, where oxidation and reduction of electrode coatings result in actively controllable optical properties by application of electrical potential. These windows reduce the energy cost of a building envelope by dynamically changing the solar transmission through the windows which are used to optimize both the lighting costs and thermal gains with changing outdoor conditions. Commercial electrochromic windows are now becoming available; however, to obtain broader market acceptance the cost/benefit ratio of these windows must be improved. The windows being introduced into the marketplace do not use sol-gel technology in their manufacturing process. Judicious use of sol-gel technology can assist in obtaining a more favorable cost/benefit ratio. Sol-gel processes offer the opportunity of making the cost attractive, given the unique aspects of the coatings used in this application, which include multiple metal oxide compositions, significant thickness, microstructural requirements, incorporation of mobile ions and the ability to effectively use low-cost transparent conductors.

Keywords

Bleached state Dip coating Electrochromic Fluorine-doped tin oxide Indium tin oxide Insulated glass unit Intercalation Physical vapor deposition (PVD) Plasma enhanced chemical vapor deposition (PECVD) Reversible electrochemical devices Sputtering Switchable devices Tungsten oxide WO3 film 

List of abbreviations

EC

Electrochromic

IGU

Insulated glass unit

FTO

Fluorine doped tin oxide

ITO

Indium tin oxide

ASTM

American society for testing materials

UCPC

User controlled photochromic devices

PVD

Physical vapor deposition

PECVD

Plasma enhanced chemical vapor deposition

References

  1. 1.
    Warner JL, Reilly MS, Selkowitz SE, Arasteh DK, Ander GD (1992) Utility and economic benefits of electrochromic smart windows. Lawrence Berkeley Laboratory report LBL-32368Google Scholar
  2. 2.
    Selkowitz SE, Rubin M, Lee ES, Sullivan R, Finlayson E, Hopkins D (1994) A review of electrochromic window performance factors. Lawrence Berkeley Laboratory, report LBL-35486Google Scholar
  3. 3.
    Lee E (2006) A design guide for early-market electrochromic windows. Report prepared for California Energy Commission by Lawrence Berkeley Laboratory, CA, report# CEC-500-2006-052-AT16, http://windows.lbl.gov/comm_perf/Electrochromic/refs/LBNL-59950.pdf. Accessed 16 Feb 2011
  4. 4.
    Sullivan R, Rubin M, Selkowitz S (1996) Energy performance analysis of prototype electrochromic windows. Lawrence Berkeley National Laboratory report # LBNL 39905Google Scholar
  5. 5.
    Papaefthimiou S, Syrrakou E, Yianoulis P (2006) Energy performance assessment of an electrochromic window. Thin Solid Films 502:257–264CrossRefGoogle Scholar
  6. 6.
    Pawlicka A (2009) Development in electrochromic devices. Recent Patents Nanotechnol 3:177–181CrossRefGoogle Scholar
  7. 7.
    Gentex Corporation, Zeeland, Michigan, USA (2008) Annual reportGoogle Scholar
  8. 8.
    Ferrari cars, Superamerica. http://www.ferraricars.org/ferrari-superamerica/. Accessed 23 Feb 2011
  9. 9.
    Giron J-C, Schütt, J, Pender D, BéteilleF, Fanton X (2003) Proceedings of Glass Processing Days. pp 460–461Google Scholar
  10. 10.
    Gentex Corporation, Zeeland, Michigan, USA (2009) Annual reportGoogle Scholar
  11. 11.
    Lampert CL (2004) Chromogenic materials. Mater Today 7(3):28CrossRefGoogle Scholar
  12. 12.
    Agrawal A, Cronin JP, Zhang R (1993) Review of solid state electrochromic coatings produced using sol-gel techniques. Sol Energy Mater Sol Cells 31:9–21CrossRefGoogle Scholar
  13. 13.
    Livage J, Ganguli D (2001) Sol-gel electrochromic coatings and devices: a review. Sol Energy Mater Sol Cells 68:365–381CrossRefGoogle Scholar
  14. 14.
    Heusing S, Aegerter M (2005) Sol-gel coatings for EC devices. In: Sakka S (ed) handbook of sol-gel science and technology, Chap. 35. Kluwer Academic Publishers, New YorkGoogle Scholar
  15. 15.
    Baetens R, Jelle BP, Gustavsen A (2010) Properties, requirements and possibilities of smart windows for dynamic daylight and solar energy control in buildings: a state-of-the-art review. Sol Energy Mater Sol Cells 94:87–105CrossRefGoogle Scholar
  16. 16.
    Lampert CL, Agrawal A, Nagai J (1999) Durability Evaluation of Electrochromic Devices—an Industry Perspective. Sol Energy Mater Sol Cells 56:449CrossRefGoogle Scholar
  17. 17.
    Siegel JD (2002) The MSVD Low E ‘Premium Performance’ Myth-Actual energy conservation performance of different types of Low E glazings in residential windows. Int Glass Rev 1:55Google Scholar
  18. 18.
    Sage Electrochromics, Fairbault, MN, USA. www.sage-ec.com. Accessed 10 Mar 2011
  19. 19.
    EControl-Glas, Germany. www.econtrol-glas.de. Accessed 10 Mar 2011
  20. 20.
    Mack I, Steiner R, Oelhafen P (2009) Electrically controlled windows: perforamance of new products. In: Proceedings CISBAT Swiss federal institute of technology in Lausanne (EPFL), p 26Google Scholar
  21. 21.
    Widjaja E, Delporte G (2010) Method of making an ion-switching device without a separate lithiation step. U.S. Patent No. 7830585Google Scholar
  22. 22.
    Pitts JR, Lee S-H, Tracy C E, Gillaspie D (2009) Synthesizing thin films of lithiated transition metal oxide for use in electrochemical and battery devices. Published U.S. Patent Application No. 20090057137Google Scholar
  23. 23.
    Tench DM, Warren LF, Cunningham MA (2001) Diffusely reflecting reversible electrochromic mirror. U.S. Patent No. 6256135Google Scholar
  24. 24.
    Slack JL, Locke JCW, Song S-W, Ona J, Richardson TJ (2006) Metal hydride switchable mirrors: factors influencing dynamic range and stability. Sol Energy Mater Sol Cells 90:485–490CrossRefGoogle Scholar
  25. 25.
    Richardson TJ (2003) Electrochromic materials, devices and process of making. U.S. Patent No. 6647166Google Scholar
  26. 26.
    Huiberts JN, Griessen R, Rector JH, Wijngaarden RJ, Dekker JP, de Groot DG, Koeman NJ (1996) Nature-London 380:231CrossRefGoogle Scholar
  27. 27.
    Kazuki Y, Yasusel Y, Kazuki T (2010) All-solid-state reflective dimming electrochromic device having buffer layer and dimmer member using the same. Published U.S. Patent Application No. 20100188726Google Scholar
  28. 28.
    Tajima K, YamadaY, Okada M, Yoshimura K (2010) Accelerated degradation studies on electrochromic switchable mirror glass based on magnesium−nickel thin film in simulated environment. Sol Energy Mater Sol Cells :1716–1722Google Scholar
  29. 29.
    Bullock JN, Xu Y, Benson DK, Branz HM (1995) Tandem self-powered photovoltaic-electrochromic window coatings. In: Lampert CM, Deb SK, Granqvist CG (eds) Optical materials technology for energy efficiency and solar energy conversion XIV. Proc SPIE 2531:35–41CrossRefGoogle Scholar
  30. 30.
    Teowee G, Allemand P-M, Cronin JP, Tonazzi TCL, Agrawal A (1997) Novel photochromic devices. U.S. Patent No. 5604626Google Scholar
  31. 31.
    Teowee G, McCarthy K, Agrawal A, Allemand P-M, Cronin JP (1999) User controllable photochromic (UCPC) devices. Electrochim Acta 44:3017–3026CrossRefGoogle Scholar
  32. 32.
    Gregg BA (1997) Photoelectrochromic cells and their applications. Endeavor 21(2):52–55CrossRefGoogle Scholar
  33. 33.
    Hauch A, Georg A, Baumgärtner S, Opara-Krasovec U, Orel B (2001) New photoelectrochromic device. Electrochim Acta 46:2131–2136CrossRefGoogle Scholar
  34. 34.
    Lam D, Branda NR (2010) Variable transmittance optical filter and uses thereof. Published PCT Patent Application No. WO/2010/142019Google Scholar
  35. 35.
    Huang L-M, Chen C-H (2010) Photosensitive electrochromic device. US patent 7855822Google Scholar
  36. 36.
    Cronin JP, Kennedy SR, Agrawal A, Gudgel TJ, Uhlmann DR (1999) Electrochromic glazing. Mater Res 2(1):1–9Google Scholar
  37. 37.
    Market data obtained from current electrochromic window suppliers and distributorsGoogle Scholar
  38. 38.
    Pilkington Corporation. http://www.pilkington.com/resources/faqenergikarelegacy2.pdf. Accessed 13 Mar 2011
  39. 39.
    Skinner N, Insulating glazing in a warm climate-even more important than in a cold climate. http://www.glassfiles.com/library/article.php?id=783&search=skinner&page=1. Accessed 9 Mar 2011 (in year 2000, 280 million sq meters of IGU were produced, assuming a 4% growth rate/year for flat glass (Pilkington and the flat glass industry 2010, http://www.nsg.com/resources/pfgi2010.pdf), would result in 400 million square meters in 2010
  40. 40.
    Amiran Glass Product Guide, Schott Glass, Elmsford, NY. http://www.us.schott.com/2009_architecture/english/download/amiran_brochure_-_2008.pdf. Accessed 14 Feb 2011
  41. 41.
    Yamada S, Kitao M (1990) Modulation of absorption spectra by the use of mixed films of MocW1-cO3. In: Lampert CM, Granqvist CG (eds) Large area chromogenics: materials and devices for transmittance control. SPIE optical engineering Press, Bellingham, Washington USA, p 246Google Scholar
  42. 42.
    Heusing S, Sun D-L, Otero-Anaya J, Aegerter MA (2006) Grey, brown and blue coloring sol-gel electrochromic devices. Thin solid films 502(1–2):240–245Google Scholar
  43. 43.
    Allemand PM, Ingle A, Cronin JP, Kennedy SR, Yao Y, Tonazzi JCL, Boulton J, Agrawal A (2001) Electrochromic devices. U.S. Patent No. 6266177Google Scholar
  44. 44.
    Hashimoto S, Matsuoka S (1991) J Electrochem Soc 138:2403CrossRefGoogle Scholar
  45. 45.
    Gillet PA, Fourquet JL, Bohnke O (1992) Proc. SPIE 1728:82CrossRefGoogle Scholar
  46. 46.
    Burdis MS, Weir DGJ (2006) Electrochromic devices and methods. Published U.S. Patent Application No. 20060209383Google Scholar
  47. 47.
    Jodicke D (2009) Electrochromic elements using antioxidadnts to suppress self-discharging. Published U.S. Patent Application No. 20090225393Google Scholar
  48. 48.
    Jödicke D, Wittkopf H (2007) The 2nd generation of an electrochromic solar control glazing—ready for projects. In: Proceedings of glass performance days, pp 394–395Google Scholar
  49. 49.
    Burdis MS, Siddle JR, Batchelor RA, Gallego JM (1998) V0.5Ti0.5Ox thin films as counterelectrodes for electrochromic devices. Sol Energy Mater Solar Cells 54(1–4):93–98Google Scholar
  50. 50.
    Burdis MS, John DG (2008) Electrochromic devices and methods. Published U.S. Patent Application No. 20080169185Google Scholar
  51. 51.
    Wittkopf H (2010) Elektrochrome Beschichtungen. Sonnenchutzglaser der neuen Generation Vakum in Forchung and Praxis 22(3):26–30Google Scholar
  52. 52.
    Garg D, Henderson PB, Hollingsworth RE, Jensen DG (2005) An economic analysis of the deposition of electrochromic WO3 via sputtering or plasma enhanced chemical vapor deposition. Mater Sci Eng B119:224–231CrossRefGoogle Scholar
  53. 53.
    Brinker CJ, Scherer GW (1990) Sol-gel science:the physics and chemistry of sol-gel processing, Chap. 13. Academic Press, New YorkGoogle Scholar
  54. 54.
    Crandall RS, Faughan BW (1976) Dynamics of coloration of amorphous electrochromic films of WO3 at low voltages. Appl Phys Lett 28(2):95–97CrossRefGoogle Scholar
  55. 55.
    Mohapatra SK (1978) Electrochromism in LixWO3. J Electrochem Soc Solid State Sci Technol 125(2):284–288Google Scholar
  56. 56.
    Randin J-P, Viennet R (1983) Proton diffusion in tungsten trioxide films. J Electrochem Soc: Solid State Sci Technol 129(10):2349–2354Google Scholar
  57. 57.
    Kamimori T, Nagai J, Mizuhashi M (1983) Transport of Li+ ions in amorphous tungsten oxide films. SPIE 428:51–56Google Scholar
  58. 58.
    Zhang J-G, Tracy CE, Benson DK, Deb SK (1993) The influence of microstructure on the electrochromic properties of LixWO3 thin films: part I. Ion diffusion and electrochromic properties. J Mater Res 8(10):2646–2656Google Scholar
  59. 59.
    Zhang J-G, Tracy CE, Benson DK, Deb SK (1993) The influence of microstructure on the electrochromic properties of LixWO3 thin films: part II. Limiting mechanisms in coloring and bleaching processes. J Mater Res 8(10):2657–2667Google Scholar
  60. 60.
    Cronin J P, Tarico D J, Agrawal A, Zhang R (1994) Method for depositing high performing electrochromic layers. Published U.S. Patent No. 5277986Google Scholar
  61. 61.
    Cronin JP, Kennedy SR, Agrawal A, Gudgel TJ, Yao YJ, Tonazzi JCL (1999) Properties of WO3 coatings for large area electrochromic devices. In: Sundaram SK, Bickford DF, Hornyak EJ Jr (eds) Electrochemistry of glass and ceramics (Ceramic Transitions), vol 92. American Ceramic Society, USA, pp 175–193Google Scholar
  62. 62.
    Cheng W, Baudrin E, Dunn B, Zink JI (2001) Synthesis and electrochromic properties of mesoporous tungsten oxide. J Mater Chem 11:92–97CrossRefGoogle Scholar
  63. 63.
    Ozkan E, Lee S-H, Liu PC, Tracy E, Tepehan FZ, Pitts JR, Deb SK (2002) Electrochromic and optical properties of mesoporous tungsten oxide films. Solid State Ionics 149:139CrossRefGoogle Scholar
  64. 64.
    Deepa M, Singh DP, Shivaprasad SM, Agnihotri SA (2007) A comparison of electrochromic properties of sol-gel derived amorphous and nanocrystalline tungsten oxide films. Curr Appl Phy 7:220–229CrossRefGoogle Scholar
  65. 65.
    Vink TJ, Boonekamp EP, Verbeek RGFA, Tamminga Y (1999) Lithium trapping at excess oxygen in sputter-deposited a-WO3 films. J Appl Phy 85(3):1540–1544CrossRefGoogle Scholar
  66. 66.
    Burdis M (1997) Properties of sputtered thin films of vanadium-titanium oxide for use in Electrrochromic windows. Thin Solid Films 311:286–298CrossRefGoogle Scholar
  67. 67.
    Cronin JP, Tarico DJ, Tonazzi JC, Agrawal A, Kennedy SR (1993) Microstructure and properties of sol-gel deposited WO3 coatings for large area electrochromic windows. Sol Energy Mater Sol Cells 29:371–386CrossRefGoogle Scholar
  68. 68.
    Cronin JP, Tarico DJ, Agrawal A, Zhang RL, Tonazzi JCL (1996) Precursor solutions for forming coatings. U.S. Patent No. 5,525,264Google Scholar
  69. 69.
    Allemand PM, Ingle A, Cronin JP, Kennedy SR, YaoY, Tonazzi JCL, Boulton J, Agrawal A (2001) Electrochromic devices. US Patent No. 6266177B1Google Scholar
  70. 70.
    Agrawal A, Tonazzi JCL LeCompte R, Cronin JP, Kennedy SR. McCarthy K, Denesuk M, Teowee G (2001) Busbars for electrically powered cells. US Patent No. 6317248Google Scholar
  71. 71.
    Gerhardinger P, Stickler D (2008) Fluorine doped tin oxide coatings-over 50 years and going strong. Key Eng Mater 380:169–178CrossRefGoogle Scholar
  72. 72.
    Pilkington TEC Glass Product informationhttp://Products.construction.com/swts_content_files/1179/313761.pdf. Accessed 8 Mar 2011
  73. 73.
    Cronin JP, Agrawal A, Trosky M (1999) Method for reducing haze in tin oxide transparent conductive coatings. US Patent No. 5900275Google Scholar
  74. 74.
    Holland L, Siddall G (1953) The properties of reactively sputtered metal oxide films. Vacuum 3(4):375–391Google Scholar
  75. 75.
    Alden JS, Dai H, Knapp MR, Na S, Pakbaz H, Pschenitzka F, Quan X, Spaid M A, Winoto A, Wolk J (2007) Nanowires based transparent conductors. Published U.S. Patent Application No. 2007/0074316Google Scholar
  76. 76.
    Agrawal A, Cronin JP, Metal coatings, conductive nanoparticles and applications of the same. Published US Patent Application No. 20100002282Google Scholar
  77. 77.
    Allemand P-M Grimes FR, Bigelow BA, Agrawal A (2001) Electrochromic devices with improved processability and methods of preparing the same. US Patent No. 6,327,069Google Scholar
  78. 78.
    Agrawal A, Zhang R, Boulton J (2002) Chromogenic glazing for automobiles and display filters. US Patent No. 6373618Google Scholar

Copyright information

© © Springer Science+Business Media New York 2012

Authors and Affiliations

  1. 1.AJJER LLCTucsonUSA

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