Valery Rumyantsev
Head of Research group
Institutional affiliation Ioffe Physical-Technical Institute,

The Institute for Precise Mechanics and Optics, St.Petersburg, Russia 02/1970 optoelectronics
Ioffe Physical-Technical Institute, St.Petersburg, Russia PhD 02/1978 semiconductor devices based on III-V heterostructures:
Ioffe Physical-Technical Institute, St.Petersburg, Russia Doctor of sciences Degree 11/1989 lasers, LEDs,
solar cells

A. Personal Statement
Lattice-matched InGaP/InGaAsP/GaAs heterostructures for visible heterolasers and photosensitive devices (middle of the 1970s) have been developed for the first time. Luminescent properties of the AlGaAs-GaAs heterostructures for high-efficient light emitting diodes and heterolasers have been investigated; proposed a new structure of a concentrator solar cell with intermediate conversion of radiation (late 1970s). Concentrator photovoltaic modules and PV installations based on high efficiency heterostructure solar cells (since 1980) and multijunction solar cells (since 1994) have been developed. Proposed and realized high-efficiency modules of “all-glass” design with small-aperture area silicone-on-glass Fresnel lens concentrators (since 1999). Solar photovoltaic installations with automotive tracking systems have been constructed. New characterization methods and equipment for research in the field of photovoltaics have been proposed and realized.
Radical improvements in concentrator module design have been introduced during last decade. The concept of small-aperture area sub-modules have been combined with a concept of “silicone-on-glass” technology (in world practice this technology has been labeled as “SoG”) for Fresnel lens concentrators, and a concept of “all-glass” module design. Proposed and realized has been SoG technology for the Fresnel lens solar concentrator panels. All the concepts have been realized in the concentrator modules developed in co-operation with the Fraunhofer Institute for Solar Energy Systems (Germany) for commercialization in a start-up firm. The unique module features include the cover and bottom plates made out of glass and a relatively small 4 x 4 cm² aperture of the primary lens which is assembled in an array. Also, the work on more efficient use of solar spectrum in photovoltaic converters was carried out in co-operation with the Instituto de Energia Solar (Spain) and other European institutions.
A very important issue is creation of the characterization equipment for such a new branch of photovoltaics as solar concentrator photovoltaics. Proposed, designed and manufactured were flash solar simulators/testers specialized for III-V photovoltaics approach. Among them are the following: the instruments for cell chips characterization (sun concentration ratio of up to 5000X and more); “large-area” instruments for flat PV arrays (in particular, for arrays of up to 2x3 m2 and PV systems for space applications); the multilamp testers with variable spectrum; the testers, simultaneously simulating three parameters as sun spectrum, 1 sun intensity and angle size of the sun disk. Such an instrument can be used for in-line output sorting the concentrator modules up to 0.5x1 m2 in size. Some of the characterization instruments developed by Prof. Rumyantsev in the frame of the joint projects have been delivered to the world PV centers, such as the Fraunhofer ISE, NREL, Spectrolab.

B. Positions and Honors
1971: Post-graduate student, Research Engineer, Research Scientist at the Ioffe Physical-Technical Institute
1976: Winner of the National Prize for young scientists for the work on "Semiconductor sources of visible light"
1978: PhD obtained at the Ioffe Physical-Technical Institute
1989: Doctor of Science degree obtained at Ioffe Institute
1991: Chief Scientist of the PV Lab at Ioffe Institute
1993: Title of Professor obtained at Ioffe Institute
1996: "A.F.Ioffe Prize for Semiconductor Physics" of Russian Academy of Sciences.
Member of the Section “Photovoltaic energy conversion” of the Scientific Council at the Russian Academy of Sciences (1984 – present). Expert of the Russian Foundation for the Basic Research (2005-present). Expert of the State Corporation RUSNANOTECH (2009-present). Chair of the State Graduate Commission at the Polytechnical University (St.-Petersburg) (2003-present).

C. Selected Peer-reviewed Publications
1. V.D.Rumyantsev, J.-A.Rodriguez. "Luminescent characterization of contactless AlGaAs/GaAs heterostructure for solar cells and diodes". Solar Energy Materials and Solar Cells, 1993, v.31, p.357-370.
2. V.M.Andreev, V.D.Rumyantsev "A3B5 based solar cells and concentrating optical elements for space PV modules", Solar Energy Materials and Solar Cells, 44 (1996), pp.319-332.
3. V.M.Andreev, V.A.Grilikhes, V.D.Rumyantsev “Photovoltaic Conversion of Concentrated Sunlight” (monograph), J.Wiley & Sons Ltd, 1997.
4. C.Algora, V.M.Andreev, V.P.Khvostikov, V.D.Rumyantsev, “A GaAs solar cell with an efficiency of 26.2% at 1000 suns and 25% at 2000 suns”, IEEE Transactions of Electron Devices, 48, (2001), 840-844.
5. Zh.I. Alferov, V.D. Rumyantsev “Trends in the development of solar photovoltaics” in the book “Next generation photovoltaics”, Institute of Physics Publishing House, Bristol-Philadelphia, 2004.
6. Zh.I.Alferov, V.M.Andreev, V.D.Rumyantsev “III-V heterostructures in photovoltaics” in: “Concentrator Photovoltaics”, Eds.: A.Luque, V.Andreev, Springer Series in Optical Sciences, vol.130, 2007, pp. 25-50.
7. V.D.Rumyantsev “Terrestrial concentrator PV systems” in the book “Concentrator Photovoltaics”, Eds.: A.Luque, V.Andreev, Springer Series in Optical Sciences, vol.130, 2007, pp. 151-174.
8. Zh.I.Alferov, V.M.Andreev, V.D.Rumyantsev “III-V solar cells and concentrator arrays” in “High-Efficient Low-Cost Photovoltaics”, Eds.: V.Petrova-Koch, R.Hezel, A.Goetzberger, Springer Series in Optical Sciences, Vol. 140, 2008, pp. 101-141, ISSN: 0342-4111 ISBN: 978-3-540-79358-8.
9. Valery D. Rumyantsev “Solar concentrator modules with silicone-on-glass Fresnel lens panels and multijunction cells” OPTICS EXPRESS Vol. 18, No. S1, 2010, pp. A17-A24.

D. Research Support
Research project “Investigation of the thermophotovoltaic converters based on heterostructures” (1997-1999 years) in the frame of the Federal Program of Basic Research. Advanced GaSb and related compounds based thermophotovoltaic converters have been developed for operation with high-temperature emitters of photons. The project leader: V.D. Rumyantsev.
Research project “Investigation of the thermophotovoltaic generators based on heterostructure photovoltaic cells” (2003-2005 years) in the frame of the Federal Program of Basic Research. Experimental thermophotovoltaic generators have been developed operating with gas-fired high-temperature emitter of photons in a view of the temperature resistant mesh. The project leader: V.D. Rumyantsev.
Research project “Investigations directed on efficiency increase in photovoltaic modules with sunlight concentrators” (2009-2011 years) in the frame of the Federal Program of Basic Research. Experimental solar photovoltaic modules have been developed based on the panels of the small-aperture area Fresnel lenses and panels of the triple-junction cells. The project leader: V.D.Rumyantsev.