Over the past 20 years, third generation excitonic solar cell technology has opened up a new exciting possibility and paradigms to produce electricity at lower cost as compared to Si solar cell technology. These devices can be utilized to exploit the near infrared (NIR) region of solar spectrum, which is typically lost in the commercial Si solar cells. In addition, all materials used for the fabrication of these devices are cheap, abundant and environmental friendly. This makes them a promising as well as realistic to reduce the overall cost of harvesting solar power. However, the photoconversion efficiency (PCE) of these solar cells is lower than Si-solar cells due to some undesirable carrier recombination processes that occur at different interfaces, are major bottlenecks for further improvement of the PCE.
My research work is mainly focused to improve the overall PCE of these excitonic solar cells by utilizing newly design nanostructured semiconductor materials. In particular to explore the effect of a careful material design on the physical-chemical processes governing the device mechanisms such as the charge separation, injection and transport. Furthermore the synthesis of these engineered nanostructured is framed in a green chemistry approach, devoted to explore the use of both cheap and simple materials and processes, respectful towards our environment. Results of this work will be very helpful to the scientific community working in this filed in order to develop new experimental techniques and theory to comprehend the unexplored phenomena to achieve further progress in the field of excitonic solar cells.
• Ph.D. in Materials for Engineering, Università degli Studi di Brescia, CNR-INO, SENSOR Laboratory, Italy, 2014.
• M.Sc. in Applied Physics, Specialization in Nano Science & Technology, Guru Nanak Dev University Amritsar, 2010.
• B.Sc. in Non-Medical Science, Punjabi University Patiala, 2008.
R. Milan, M. Hassan, G. S. Selopal, L. Borgese, M. M. Natile, L. E. Depero, G. Sberveglieri, I. Concina “A player often neglected: electrochemical comprehensive analysis of counter electrodes for quantum dot solar cells” ACS Applied Material and Interfaces, 2016, 8, 7766–7776.
G. S. Selopal, H.-P. Wu, J. Lu, Y.-C. Chang, M. Wang, A. Vomiero, I. Concina, E. W. G. Diau “Metal-free organic dyes for ZnO-based dye – sensitized solar cells” Scientific Reports, 2015, 6, 12P, 18756.
G. S. Selopal, R. Milan, I. Concina, V. Morandi, L. Ortolani, R. Rizzoli, G. Sberveglieri, G. P. Veronese, A. Vomiero “Graphene front contact for dye sensitized solar cells” Solar Energy Materials and Solar Cells, 2015, 135, 99-105.
R. Milan, G. S. Selopal, M. Epifani, M. M. Natile, G. Sberveglieri, A. Vomiero, I. Concina, “ZnO@SnO2 engineered composite photoanodes for dye sensitized solar cells” Sci. Reports, 2015, 5, 11p, 14523.
K. T. Dembele, G. S. Selopal, R. Milan, S. Afsoon, M. Mouna, I. Concina, G. Sberveglieri, F. Rosei, A. Vomiero “Graphene below the Percolation Threshold in TiO2 for High-Efficiency Dye-Sensitized Solar Cells” Journal of Materials Chemistry A, 2014, 3, 2580.
G. S. Selopal, N. Memarian, R. Milan, I. Concina, G. Sberveglieri, A. Vomiero “Effect of blocking layer to boost photoconversion efficiency in ZnO dye sensitized solar cells” ACS Applied Material & Interfaces, 2014, 6 (14), 11236-11244.
G. S. Selopal, I. Concina, R. Milan, M. M. Natile, G. Sberveglieri, A. Vomiero “Hierarchical self-assembled Cu2S nanostructures: fast and reproducible spray deposition of effective counter electrodes for high efficiency quantum dot solar cells”, Nano Energy, 2014, 6, 200-210.
I. Concina, G. S. Selopal, R. Milan, G. Sberveglieri, A. Vomiero “Light harvester band gap engineering in excitonic solar cells: a case study on semiconducting quantum dots sensitized rainbow solar cells”, Pure and Applied Chemistry, 2014, 86, 575-585.
H. Zhao, Z. Fan, H. Liang, G. S. Selopal, B. A. Gonfa, L. Jin, A. Soudi, D. Cui, F. Enrichi, M. M. Natile, I. Concina, D. Ma, A. O. Govorov, F. Rosei, A. Vomiero “Controlling Photoinduced Electron Transfer from Quantum Dots to Metal Oxide Nanostructured Thin Films”, Nanoscale, 2014, 6, 7004-7011.
K. T. Dembele, G. S. Selopal*, C. Soldano, R. Nechache, J. C. Rimada, I. Concina, G. Sberveglieri, F. Rosei, A. Vomiero “Hybrid carbon nanotubes-TiO2 photoanodes for high efficiency dye sensitized solar cells”, Journal of Physical Chemistry C, 2013, 117, 14510–14517.
I. Concina, N. Memarian, G. S. Selopal, M. M. Natile, A. Vomiero, G. Sberveglieri “Spray-assisted SILAR deposition of semiconductor quantum dots on metal oxide films for excitonic solar cells”, Journal of Power Sources, 2013, 240, 736-744.
R. Milan, G. S. Selopal, I. Concina, M. Epifani, A. Vomiero, G. Sberveglieri “Tailor-made ZnO@SnO2 network for highly efficiency photovoltaic devices” SPIE Photonics 8987, Oxide-based Materials and Devices V, 898728 (March 8, 2014), doi:10.1117/12.2040382.
I. Concina, G. S. Selopal, R. Milan, A. Vomiero, G. Sberveglieri “Engineering metal oxide structures for efficient photovoltaic devices” SPIE Photonics 8987, Oxide-based Materials and Devices V, 89872E (March 8, 2014), doi:10.1117/12.2038872.
A. Kumar, G. Singh, M. Lal, S. K. Tripathi, N. Goyal “Dielectric studies of Se85−xTe15Inx glasses” AIP Conf. Proc. 1393, 355 (2011), doi.org/10.1063/1.3653756.
G. S. Selopal, I. Concina, R. Milan, M. Epifani, A. Vomiero, G. Sberveglieri “Engineered metal oxides alternatives to TiO2 for efficient photovoltaic devices” at MRS Spring meeting, San Francisco, USA, 21-25 April 2014. (Oral presentation)
G. S. Selopal, I. Concina, R. Milan, M. Epifani, A. Vomiero, G. Sberveglieri “Engineering ZnO@SnO2 Multilayer Structures as Photoanodes for High Efficiency Photovoltaic Devices”. MRS Fall Meeting, Boston, USA, 1-6 December 2013. (Poster presentation)
G. S. Selopal, I. Concina, R. Milan, M. M. Natile, A. Vomiero G. Sberveglieri “Spray Deposition: A Versatile Technique for Quantum Dot-Based Photovoltaics”. MRS Fall Meeting, Boston, USA,1-6 December 2013. (Poster presentation)
G. S. Selopal, I. Concina, R. Milan, G. Sberveglieri, A. Vomiero “Electrochemical impedance spectroscopy of Quantum Dot solar cells” at International Workshop on Impedance Spectroscopy, Chemnitz, Germany, 25-27 September 2013. (Poster presentation)
G. S. Selopal, I. Concina, R. Milan, M. M. Natile, L. Borgese, F. Bilo, G. Sberveglieri , A.Vomiero “Spray deposition of Cu2S/CuS composite thin film an efficient counter electrode for quantum dot sensitized solar cells”. E-MRS Spring Meeting, Strasbourg, France, 28-30 May 2013. (Poster presentation)