Integrating Photovoltaic Cells into Decorative Architectural Glass Using Traditonal Glass-Painting Techniques and Fluorescent Dyes

Integrating Photovoltaic Cells into Decorative Architectural Glass Using Traditonal Glass-Painting Techniques and Fluorescent Dyes

D.A.Hardy S.C.Roaf  B.S.Richards 

School of Engineering and Physical Sciences, Heriot-Watt University, United Kingdom

School of Energy, Geoscience, Infrastructure and Society, Heriot-Watt University, United Kingdom

Institute of Microstructure Technology, Karlsruhe Institute of Technology, Germany. Light Technology Institute, Karlsruhe Institute of Technology, Germany

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Photovoltaic (PV) cells can be integrated into decorative glass, providing a showcase for this renewable technology, whilst assisting in the creation of sustainable architecture through generation of electricity from the building surface. However, traditional, opaque, square, crystalline-silicon solar cells contrast strongly with their surroundings when incorporated into translucent, coloured glazing. Methods of blending PV cells into their surroundings were developed, using traditional glass painting techniques. A design was created in which opaque paint was applied to the areas of glass around underlying PV cells. Translucent, platinum paint was used on the glass behind the PV cells. This covered the grey cell backs whilst reflecting light and movement. The platinum paint was shown to cause a slight increase in power produced by PV cells placed above it. To add colour, very small amounts of Lumogen F dye (BASF) were incorporated into a silicone encapsulant (Dow Corning, Sylgard 184), which was then used to hold PV cells in place between sheets of painted glass. Lumogen dyes selectively absorb and emit light, giving a good balance between colour addition and electricity production from underlying PV cells. When making sufficient quantities of dyed encapsulant for a 600 ? 450 mm test piece, the brightness of the dye colours faded and fluorescence decreased, although some colour was retained. Improvement of the method, including testing of alternative encapsulant materials, is required, to ensure that the dyes continue to fluoresce within the encapsulant. In contrast, the methods of adding opacity variation to glass, through the use of glass painting, are straightforward to develop for use in a wide vari- ety of PV installations. Improvement of these methods opens up a wide variety of architectural glass design opportunities with integrated PV, providing an example of one new medium to make eco-architecture more aesthetically pleasing, whilst generating electricity.


architectural glass, encapsulant, fluorescent organic dye, glass paint, lumogen dye, photovoltaics, reflective surface, solar, sustainable architecture, Sylgard 184.


[1] Roaf, S., Hyde, R., Campbell, C. & Seigert, M., Transforming markets in the built environment and adapting to climate change: an introduction. Architectural Science Review, 53(1), pp. 3–11, 2010. doi:

[2] Roaf, S., Crichton, D. & Nicol, F., Adapting Buildings and Cities for Climate Change, Oxford: Routledge, 2009. doi:

[3] Scognamiglio, A. & Røstvik, H.N., Photovoltaics and zero energy buildings: a new opportunity and challenge for design. Progress in Photovoltaics: Research and Applications, 21, pp. 1319–1336, 2012. doi:

[4] Schoen, T., Prasad, D., Ruoss, D., Eiffert, P. & Sørensen, H., Task 7 of the IEA PV Power Systems Program – Achievements and Outlook, 17th European Photovoltaic Solar Conference, 24 October 2001, Munich.

[5] Photon International, Multicrystalline modules will dominate market in 2014, NPD Solarbuzz. Photon International: Aachen, 2013 [9 April 2014]; Available at

[6] Hardy, D., Kerrouche, A., Roaf, S. & Richards, B.S., The search for building-integrated PV materials with good aesthetic potential: a survey. PVSAT-7: 7th Photovoltaic Science, Applications and Technology Conference, eds. M.G. Hutchins and N. Pearsall, 6–8 April 2011; Heriot-Watt University, The Solar Energy Society.

[7] Riedel, A., Creating electricity, letting light through. PV Magazine, 71-3, 2010.

[8] Reyntiens, P., The Beauty of Stained Glass, Herbert Press: London, 1990.

[9] Moor, A., Colours of Architecture, Octopus: London, 2006.

[10] Devenport, S., Roberts, S., Bruton, T.M., Heasman, K., Brown, L., Cole, A., et al., A summary of the havemor project – process development of shaped and coloured solar cells for BIPV applications, 24th European Photovoltaic Solar Energy Conference and Exhibition; 21–25 Sept 2009; Hamburg.

[11] Onyx Solar, Photovoltaic Glass Patterns, Onyx Solar Group LLC: Avila, Spain [27 March 2014], available at

[12] Baum, R., Architectural integration of light-transmissive photovoltaic (LTPV). EU PVSEC, 5–9 September 2011, Hamburg.

[13] Baum, R., Studies on light-transmissive photovoltaics (LTPV): patterns of integration into architectural design. Tokyo, 2012.

[14] Farkas, K., Architectural integration of photovoltaics: formal and symbolic aesthetics of photovoltaics [PhD], Norwegian University of Science and Technology: Trondheim, 2013.

[15] oensgen, J., Solar-Kunst am Parkhaus Pilgrimstein, Marburg [9 April 2014]; available at template=bild_template&id=96054&ges_id=5.

[16] Goodpasture, L., Art and Design: Art for Architecture, 2011 [6 August 2012]; available at

[17] Hall, S., ‘Lux Nova’ wind tower with solar cells, Regent College, University of British Columbia, Vancouver, British Columbia, Canada [9 September 2012]; available at http://www.

[18] orrado, C., Leow, S.W., Osborn, M., Chan, E., Balaban, B. & Carter, S.A., Optimization of gain and energy conversion efficiency using front-facing photovoltaic cell luminescent solar concentrator design. Solar Energy Materials and Solar Cells, 111(0), pp. 74–81, 2013. doi:

[19] Klampaftis, E., Ross, D., McIntosh, K.R. & Richards, B.S., Enhancing the performance of solar cells via luminescent down-shifting of the incident spectrum: a review. Solar Energy Materials and Solar Cells, 93(8), pp. 1182–1194, 2009. doi:

[20] Klampaftis, E. & Richards, B.S., Improvement in multi-crystalline silicon solar cell efficiency via addition of luminescent material to EVA encapsulation layer. Progress in Photovoltaics: Research and Applications, 19(3), pp. 345–351, 2011. doi:

[21] Hardy, D., Kerrouche, A., Roaf, S.C. & Richards, B.S., Improving the aesthetics of photovoltaics through use of coloured encapsulants. PLEA2013 – 29th Conference: Sustainable Architecture

[22] angopadhyay, U., Jana, S. & Das, S., State of art of solar photovoltaic technology. Conference Papers in Energy, 2013, p. 9, 2013. doi:

[23] Dross, F., Labat, A., Antonio Perez Lopez, M., Antonio Perez Lopez, M., Raudez, R., Bruce, A., et al., Vacuum-free, cost-effective, developing-country-material-available solar cell encapsulation. Solar Energy Materials and Solar Cells, 90(14), pp. 2159–2166, 2006. doi:

[24] Hardy, D., Kerrouche, A., Roaf, S. & Richards, B., A silicone host for lumogen dyes. PVSAT-8: 8th Photovoltaic Science, Applications and Technology Conference, eds. M. Hutchins, N. Pearsall & A. Cole, Northumbria University: Newcastle, 2012. The Solar Energy Society.

[25] BASF, Lumogen F Collector Dyes: Technical Information. BASF: Ludwigshafen, Germany, 1997 [20 April 2012]; available at

[26] Kerschaver, E.V. & Beaucarne, G., Back-contact solar cells: a review. Progress in Photovoltaics: Research and Applications, 14(2), pp. 107–123, 2006. doi:

[27] Wilberforce, R., ed., The Link Between Glazing and Climate Change. Glass in Buildings, The Centre for Window and Cladding Technology: Bath, 1999.

[28] Leatherland, E., Possibilites for the use of Low emissivity glass by surface coating manipulation within a creative contex [PhD]. University of Sunderland: Sunderland, 2012.

[29] Roberts, S. & Guariento, N., Building Integrated Photovoltaics: A Handbook, Birkhauser: Basel, 2009.

[30] Aberle, A.G., Thin-film solar cells. Thin Solid Films, 517(17), pp. 4706–4710, 2009. doi:

[31] Po, R., Bernardi, A., Calabrese, A., Carbonera, C., Corso, G. & Pellegrino, A., From lab to fab: how must the polymer solar cell materials design change? – an industrial perspective. Energy & Environmental Science, 7(3), pp. 925–943, 2014. doi:

[32] Hardy, D.A., Roaf, S.C. & Richards, B.S., Improving the aesthetics of photovoltaics in decorative architectural glass, WIT Transactions on the Built Environment, 142, 2014, ISSN 1743-3509. doi: