WO9745879-A  13TH EUROPEAN PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, vol. I, 23 - 27 October 1995, NICE, FR, pages 69-72, XP002038448 A.C. VARONIDES ET AL.: "A new aligned quantum well (AQL) InP/In(0.53)Ga(0.47)As p-i-n multiquantum well solar cell";  21ST INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, vol. 2, 25 - 29 August 1986, SAN DIEGO, USA, pages 1314-1317, XP002038449 C.R. PARENT ET AL.: "Thermophotovoltaic energy conversion with a novel rare earth oxide emitter";  APPLIED SURFACE SCIENCE, vol. 113/114, April 1997, AMSTERDAM, NL, pages 722-733, XP002038450 K. BARNHAM ET AL.: "Quantum well solar cells";  WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY, WAIKOLOA, DEC. 5 - 9, 1994, vol. VOL. 2, no. CONF. 1, 5 December 1994, INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, pages 1738-1741, XP000680147 WILT D M ET AL: "LATTICE MISMATCHED INGAAS PHOTOVOLTAIC DEVICES FOR THERMOPHOTOVOLTAIC POWER SYSTEMS";  WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY, WAIKOLOA, DEC. 5 - 9, 1994, vol. VOL. 2, no. CONF. 1, 5 December 1994, INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, pages 1886-1889, XP000680166 FREUNDLICH A ET AL: "INP - BASED QUANTUM WELL SOLAR CELLS GROWN BY CHEMICAL BEAM EPITAXY"GB2313474-A  INSPEC abstract no. A9611-8630M-011 & Proc.Intersociety Energy Conversion Engineering Conf,vol3,p87WO9745879-A1  13TH EUROPEAN PHOTOVOLTAIC SOLAR ENERGY CONFERENCE, vol. I, 23 - 27 October 1995, NICE, FR, pages 69-72, XP002038448 A.C. VARONIDES ET AL.: &quot;A new aligned quantum well (AQL) InP/In(0.53)Ga(0.47)As p-i-n multiquantum well solar cell&quot;;  21ST INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, vol. 2, 25 - 29 August 1986, SAN DIEGO, USA, pages 1314-1317, XP002038449 C.R. PARENT ET AL.: &quot;Thermophotovoltaic energy conversion with a novel rare earth oxide emitter&quot;;  APPLIED SURFACE SCIENCE, vol. 113/114, April 1997, AMSTERDAM, NL, pages 722-733, XP002038450 K. BARNHAM ET AL.: &quot;Quantum well solar cells&quot;;  WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY, WAIKOLOA, DEC. 5 - 9, 1994, vol. VOL. 2, no. CONF. 1, 5 December 1994, INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, pages 1738-1741, XP000680147 WILT D M ET AL: &quot;LATTICE MISMATCHED INGAAS PHOTOVOLTAIC DEVICES FOR THERMOPHOTOVOLTAIC POWER SYSTEMS&quot;;  WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY, WAIKOLOA, DEC. 5 - 9, 1994, vol. VOL. 2, no. CONF. 1, 5 December 1994, INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, pages 1886-1889, XP000680166 FREUNDLICH A ET AL: &quot;INP - BASED QUANTUM WELL SOLAR CELLS GROWN BY CHEMICAL BEAM EPITAXY&quot;