“Highly efficient Cu(In,Ga)Se₂ solar cells grown on flexible polymer films”, A. Chirilã, S. Buecheler, F. Pianezzi, P. Bloesch, C. Gretener, A.R. Uhl, C. Fella, L. Kranz, J. Perrenoud, S. Seyrling, R. Verma, S. Nishiwaki, Y.E. Romanyuk, G. Bilger, A. N. Tiwari, Nature Materials, 10, 857-861, 2011.

“Defect distribution in thin film solar cells deduced from admittance measurement under different bias voltages”, K. Decock, S. Khelifi, S. Buecheler, F. Pianezzi, A.N. Tiwari, M. Burgelman, J. Appl. Phys, 110, 063722, 2011.

“CuIn_1-xGaxSe₂ growth process modifications: influences on microstructure, Na distribution, and device properties”, S. Seyrling, A. Chirila, D. Güttler, P. Blösch, F. Pianezzi, R. Verma, S. Bücheler, S. Nishiwaki, Y.E. Romanyuk, P. Rossbach, A.N. Tiwari, Sol. Energy Mat. Sol. Cells, 95(6), 1477-1481, 2011.

“Cu(In,Ga)Se₂ solar cell grown on flexible polymer substrate with efficiency exceeding 17%”, A. Chirilã, P. Bloesch, S. Seyrling, A. Uhl, S. Buecheler, F. Pianezzi, C. Fella, J. Perrenoud, L. Kranz, R. Verma, D. Guettler, S. Nishiwaki, Y. E. Romanyuk, G. Bilger, D. Brémaud, and A. N. Tiwari, Prog. Photovolt: Res. Appl.19, 560–564, 2011.

“Influence of high growth rates on evaporated Cu(In,Ga)Se₂ layers and solar cells”, A. Chirilã, S. Seyrling, S. Buecheler, D. Guettler, S. Nishiwaki, Y.E. Romanyuk, G. Bilger, A.N.Tiwari, Prog. Photovolt: Res. Appl., published online, DOI: 10.1002/pip.1122, 2011.

“Fabrication of flexible CdTe solar modules with monolithic cell interconnection”, J. Perrenoud, B. Schaffner, S. Buecheler, A.N. Tiwari, Sol. Energy Mat. Sol. Cells, 95, S8-S12, 2011.

“Nanoscale Infrared Absorption Spectroscopy of Individual Nanoparticles Enabled by Scattering-Type Near-Field Microscopy”, J.M. Stiegler, Y. Abate, A. Cvitkovic, Y.E. Romanyuk, A.J. Huber, S.R. Leone, R. Hillenbrand, ACS Nano 5(8), 6494-6499, 2011.

"Effects of spectrum on the power rating of amorphous silicon photovoltaic devices", C. Monokroussos, M. Bliss, Y.N. Qiu, C.J. Hibberd, T.R. Betts, A.N. Tiwari and R. Gottschalg, Prog. Photovolt: Res. Appl. 19, 640–648, 2011.

“Isothermal section of the Ag₂S-PbS-GeS₂ system at 300 K and the crystal structure of Ag₂PbGeS₄”, Y. Kogut, A.O. Fedorchuk, O. Zhbankov, Y.E. Romanyuk, I. Kityk, L.V. Piskach, O.V. Parasyuk, O.J. Alloys Compd. 509(11), 4264-4267, 2011.

“The use of aluminium doped ZnO as transparent conductive oxide for CdS/CdTe solar cells”, J. Perrenoud, L. Kranz, S. Buecheler, F. Pianezzi, A.N. Tiwari, Thin Solid Films, 519, 7444-7448, 2011.

“Modification of the three-stage evaporation process for CuIn_1-xGa_xSe₂ absorber deposition” S. Seyrling, A. Chirilã, D. Güttler, F. Pianezzi, P. Rossbach, A.N. Tiwari, Thin Solid Films, 519, 7232-7236, 2011.

“Optimization of Ti/TiN/Mo back contact properties for Cu(In,Ga)Se₂ solar cells on polyimide foils”, P. Blösch, D. Güttler, A. Chirilã, A. N. Tiwari, Thin Solid Films, 519, 7453-7457, 2011.

“Thin film Cu(In,Ga)Se₂ solar cells processed from solution pastes with polymethyl methacrylate binder”, A. R. Uhl, Y. E. Romanyuk, A. N. Tiwari, Thin Solid Films, 519, 7259-7263, 2011.

“Interface formation between CuIn_1-xGa_xSe₂ absorber and In₂S₃ buffer layer”, S. Buecheler, F. Pianezzi, C. Fella, A. Chirilã, K. Decock, M. Burgelman and A.N. Tiwari, Thin Solid Films, 519, 7560-7563, 2011.

“The CuGaSe₂–CuInSe₂–2CdS system and single crystal growth of the g-phase”, O.V. Parasyuk, V.V. Atuchin, Y.E. Romanyuk, L.P. Marushko, L.V. Piskach, I.D. Olekseyuk, S.V.Volkov, V.I.Pekhnyo, J. Cryst. Growth, 318, 332-336, 2011.

"Single crystal preparation and properties of the AgGaGeS₄–AgGaGe₃Se₈ solid solution", M.V. Shevchuk, V.V. Atuchin, A.V.Kityk, A.O. Fedorchuk, Y.E. Romanyuk, S. Calus, O.M. Yurchenko, O.V. Parasyuk, J. Cryst. Growth 318, 708–712, 2011.

"Introduction to the special issue on organic photovoltaics and dye sensitized solar cells", F.A. Nüesch, H.M. Upadhyaya, T.M. Razykov, A.N. Tiwari, Solar Energy, Preface, 85(6), 1171, 2011.

“CdCl₂ Activation induced chemical interaction at the CdTe/ZnO1-xSx thin film solar cell interface”, M. Bär, J. Perrenoud, R.G. Wilks, S. Buecheler, L. Kranz, C. Fella, J. Skarp, M. Blum, W. Yang, L. Weinhardt, C. Heske, A.N. Tiwari, Proceedings of the 37th IEEE Photovoltaic Specialists Conference, Seattle, Washington, 2011.

“Flexible and lightweight solar modules for new concepts in building integrated photovoltiacs”, S. Buecheler, A. Chirila, J. Perrenoud, L. Kranz, C. Gretener, P. Blösch, F. Pianezzi, S. Seyrling, A.N. Tiwari, Proceedings of CISBAT11, Lausanne, Switzerland 2011.

“Na distribution in CIGS solar cells grown with modified three stage processes”, S. Seyrling, A. Chirila, D. Güttler, P. Blösch, F. Pianezzi, S. Bücheler, A.R. Uhl, P. Rossbach, U. Müller, A.N. Tiwari, Proceedings of the 37th IEEE Photovoltaic Specialists Conference, Seattle, Washington, 2011.

“Optimisation of Luminescent EVA Encapsulation Layers for Increasing The Short-Wavelength Response of PV Modules”, E. Klampaftis, D. Ross, S. Seyrling, A.N. Tiwari, B.S. Richards, Proceedings of the 26th European Photovoltaic Solar Energy Conference and Exhibition, Hamburg, Germany, 2011.

J.W. Bowers, H.M. Upadhyaya, T. Nakada, A.N. Tiwari
Effects of surface treatments on high mobility ITiO coated glass substrates for dye sensitized solar cells and their tandem solar cell applications
Solar Energy Materials and Solar Cells 94 (2010)

S. Calnan, A.N. Tiwari
High mobility transparent conducting oxides for thin film solar cells
Thin Solid Films 518 (7) (2010)

L.P. Marushko, LV. Piskach, Y.E. Romanyuk, O.V. Parasyuk, I.D. Oleksyuk, S.V. Volkov, V.I. Pekhnyo
Quasi-ternary system CuGaS2-CuInS2-2CdS
Journal of Alloys and Compounds 492 (1-2) (2010)

R. Verma, D. Datta, A. Chirila, D. Güttler, J. Perrenoud, F. Pianezzi, U. Müller, S. Kumar, A.N. Tiwari
Optical, structural, and chemical properties of flash evaporated In2S3 buffer layer for Cu(In,Ga)Se2 solar cells
Journal of Applied Physics 108 (2010)

C.J. Hibberd, E. Chassaing, W. Liu, D. Mitzi, D. Lincot, A.N. Tiwari
Non-vacuum methods for formation of Cu(In,Ga)(S,Se)2 thin film photovoltaic absorbers
Progress in Photovoltaics: Research and Applications 18 (6) (2010)

N. Naghavi, D. Abou-Ras, N. Allsop, N. Barreau, S. Bücheler, A. Ennaoui, C.-H. Fischer, C. Guillen, D. Hariskos, J. Herrero, R. Klenk, K. Kushiya, D. Lincot, R. Menner, T. Nakada, C. Platzer-Björkman, S. Spiering, A.N. Tiwari, T. Törndahl

A.N. Tiwari, D. Lincot, M. Contreras
The time for CIGS
Progress in Photovoltaics: Research and Applications 18 (6) (2010)

L.P. Marushko, Y.E. Romanyuk, L.V. Piskach, O.V. Parasyuk, I.D. Olekseyuk, S.V. Volkov, V.I. Pekhnyo
The reciprocal system CuGaS2+CuInS2 = CuGaSe2+CuInS2
Chemistry of Metals and Alloys 3 (2010)

A. Chirila, P. Blösch, A. Uhl, S. Seyrling, F. Pianezzi, S. Bücheler, C. Fella, S. Nishiwaki, Y.E. Romanyuk, A.N. Tiwari
Progress towards the development of 18% efficiency flexible CIGS solar cells on polymer film
Proceedings of the 25th European Photovoltaic Solar Energy Conference / 5th World Conference on Photovoltaic Energy Conversion (2010)

D. Güttler, A. Chirila, S. Seyrling, P. Blösch, S. Bücheler, X. Fontané, V. Izquierdo-Roca, L. Calvo-Barrio, A. Peréz-Rodriguez, J.R. Morante, A. Eicke, A.N. Tiwari
Influence of NaF incorporation during Cu(In,Ga)Se2 growth on microstructure and photovoltaic performance
Proceedings of the 35th IEEE Photovoltaic Specialists Conference (2010)

A. Chirila, D. Güttler, P. Blösch, S. Nishiwaki, S. Seyrling, S. Bücheler, R. Verma, F. Pianezzi, Y.E. Romanyuk, G. Bilger, R. Ziltener, D. Brémaud, A.N. Tiwari
Optimization of composition grading in Cu(In,Ga)Se2 for flexible solar cells and modules
Proceedings of the 35th IEEE Photovoltaic Specialists Conference (2010)

J. Perrenoud, S. Bücheler, L. Kranz, C. Fella, J. Skarp, A.N. Tiwari
The application of ZnO1-xSx as buffer layer in CdTe solar cells
Proceedings of the 35th IEEE Photovoltaic Specialists Conference (2010)

C. Fella, S. Bücheler, D. Güttler, J. Perrenoud, A. Uhl, A.N. Tiwari
Ultrasonically sprayed zinc sulfide buffer layers for Cu(In,Ga)(S,Se)2 solar cells
Proceedings of the 35th IEEE Photovoltaic Specialists Conference (2010)

D. Abou-Ras, R. Caballero, J. Kavalakkatt, M. Nichterwitz, T. Unold, H.-W. Schock, S. Bücheler, A.N. Tiwari
Electron backscatter diffraction: exploring the microstructure in Cu(In,Ga)(S,Se)2 and CdTe thin-film solar cells
Proceedings of the 35th IEEE Photovoltaic Specialists Conference (2010)

N. Schäuble, Y.E. Romanyuk, M.H. Aguirre, A. Shkabko, S. Yoon, A. Weidenkaff
Aluminium-substituted zinc oxide thin films: thermoelectric properties and characterisation
Proceedings of the 8th European Conference on Thermoelectrics (2010)

S. Wenger, S. Seyrling, A.N. Tiwari and M. Grätzel
Fabrication and performance of a monolithic dye-sensitized TiO₂/Cu(In,Ga)Se₂ thin film tandem solar cell
Applied Physics Letters 94 (2009)

J.W. Bowers, H.M. Upadhyaya, S. Calnan, R. Hashimoto, T. Nakada, A.N. Tiwari
Development of Nano-TiO2 dye-sensitised solar cells on high mobility transparent conducting oxide thin films
Progress in Photovoltaics: Research and Applications 17 (4) (2009)

P. Vorasayan, T.R. Betts, A.N. Tiwari, R. Gottschalg
Multi-laser LBIC system for thin film PV module characterisation
Solar Energy Materials and Solar Cells 93 (6-7) (2009)

S. Calnan, H.M. Upadhyaya, S. Bücheler, G. Khrypunov, A. Chirila, A. Romeo, R. Hashimoto, T. Nakada, A.N. Tiwari
Application of high mobility transparent conductors to enhance long wavelength transparency of the intermediate solar cell in multi-junction solar cells
Thin Solid Films 517 (7) (2009)

S. Buecheler, D. Corica, D. Guettler, A. Chirila, R. Verma, U. Müller, T.P. Niesen, J. Palm and A.N. Tiwari
Ultrasonically Sprayed Indium Sulfide Buffer Layers for Cu(In,Ga)(S,Se)2 Thin-Film Solar Cells
Thin Solid Films 517 (7), (2009)

S. Seyrling, S. Calnan, S. Buecheler, J. Hüpkes, S. Wenger, D. Brémaud, H. Zogg and A.N. Tiwari
CuIn1-xGaxSe2 Photovoltaic Devices for Tandem Solar Cell Application
Thin Solid Films 517 (7) (2009)

A. Romeo, S. Buecheler, M. Giarola, G. Mariotto, A.N. Tiwari, N. Romeo, A. Bosio, S. Mazzamuto
Study of CSS- and HVE-CdTe by different recrystallization processes
Thin Solid Films 517 (7) (2009)

S. Calnan, H.M. Uphadhyaya, S. Buecheler, G. Khrypunov, A. Chirila, A. Romeo, R. Hashimoto, T. Nakada, A.N. Tiwari
Application of high mobility transparent conductors to enhance long wavelength transparency of the intermediate solar cell in multi-junction solar cells
Thin Solid Films 517 (7) (2009)

O.V. Parasyuk, Z.V. Lavrynyuk, O.F. Zmiy, Y.E. Romanyuk
Single crystal growth and properties of the gamma-phase in the CuInSe2 - 2CdTe system
Journal of Crystal Growth 211 (18) (2009)

S.M. Sosovska, O.M. Yurchenko, Y.E. Romanyuk, I.D. Olekseyuk, O.V. Parasyuk
Phase diagram of the CdGa2Se4-Sb2Se3 system and single crystal growth of CdGa2Se4
Chemistry of Metals and Allyos 2 (2) (2009)

J. Perrenoud, S. Bücheler, A.N. Tiwari
Flexible CdTe solar cells and modules: challenges and prospects
Proceedings of SPIE on Thin Film Solar Technology vol. 7409 (2009)

R. Verma, A. Chirila, D. Güttler, J. Perrenoud, S. Bücheler, S. Seyrling, P. Mandaliev, A. Weidenkaff, A.N. Tiwari
Flexible Cu(In,Ga)Se2 solar cells with In2S3 buffer layer
Proceedings of the 24th European Photovoltaic Solar Energy Conference (2009)

S. Bücheler, R.L. Sauaia, D. Corica, C. Fella, R. Verma, A. Chirila, Y.E. Romanyuk, A.N. Tiwari
Investigation of the deposition process of ultrasonically sprayed In2S3 buffer layers for Cu(In,Ga)Se2 thin film solar cells
Proceedings of the 24th European Photovoltaic Solar Energy Conference (2009)

S. Bücheler, D. Corica, A. Chirila, D. Güttler, F. Pianezzi, R. Verma, K. Decock, A.N. Tiwari
Influence of the absorber composition in CuIn1-xGaxSe2 solar cells with sprayed In2S3 buffer layers on the dominant recombination mechanisms
Proceedings of the 24th European Photovoltaic Solar Energy Conference (2009)

S. Seyrling, S. Bücheler, A. Chirila, J. Perrenoud, R. Verma, S. Wenger, M. Grätzel, A.N. Tiwari
Towards the development of high efficiency multijunction thin film solar cells
Proceedings of the 24th European Photovoltaic Solar Energy Conference (2009)

J. Hüpkes, S.E. Pust, W. Béttler, A. Gordijn, N. Wyrsch, D. Güttler, I. Gordon, Y. Qiu
Light scattering and trapping in different thin film photovoltaic devices
Proceedings of the 24th European Photovoltaic Solar Energy Conference (2009)

J. Perrenoud, S. Bücheler, A.N. Tiwari
Flexible CdTe solar cells with high photovoltaic conversion efficiency
Proceedings of the 34th IEEE Photovoltaic Specialists Conference (2009)

A. Chirila, D. Güttler, S. Seyrling, S. Bücheler, A.N. Tiwari
Cu(In,Ga)Se2 solar cells grown by a three-stage process with different evaporation rates
Proceedings of the 34th IEEE Photovoltaic Specialists Conference (2009)

S. Seyrling, S. Bücheler, A. Chirila, S. Wenger, M. Grätzel, A.N. Tiwari
Development of multijunction thin film solar cells
Proceedings of the 34th IEEE Photovoltaic Specialists Conference (2009)

S. Seyrling, S. Wenger, M. Grätzel, A.N. Tiwari
Analysis of optical and electronical losses in Cu(In,Ga)Se2/dye sensitized cell tandem solar cells
Energy Procedia 2 (2010)

R. Verma, S. Buecheler, D. Corica, A. Chirila, S. Seyrling, J. Perrenoud, D. Guettler, C. J. Hibberd and A. N. Tiwari
Cu(In,Ga)Se2 Solar Cells with In2S3 Buffer Layers grown by Vacuum Evaporation and Chemical Spray Methods
Proc. 23rd European Photovoltaic Solar Energy Conference and Exhibition, Valencia, Spain, Sept. 1-5, 2008

D. Corica, S. Buecheler, D. Guettler, A. Chirila, S. Seyrling, R. Verma and A.N. Tiwari
Indium Sulfide Buffer Layer for Cu(In,Ga)Se2 Thin-Film Solar Cells Deposited by Ultrasonic Spray Pyrolysis
Proc. 23rd European Photovoltaic Solar Energy Conference and Exhibition, Valencia, Spain, Sept 1-5, 2008