Thin film electronics made from emerging semiconductors have the capacity to be pervasive within our daily lives. Notably, some thin film devices have established themselves quite successfully, such as the OLED for flat panel displays. The goal of my research is to work on emerging device concepts and materials to help to realize the next generation of thin film electronic devices. Specifically, we try understand and leverage the unique electronic and optical properties of thin film materials, and in particular semiconductors. This includes the use of molecular and chalcogenide (e.g. oxide) semiconductors, as well as nanostructured quantized matter for emerging applications in solar cells, light emitting devices, and transistors. Studies that we conduct range from those on fundamental optical and electrical characterization to device physics and engineering to processing. Being interdisciplinary in nature, our work resides at the intersection of electrical engineering, materials science, physics, and chemistry, and we work with materials processed either in vacuum or via solution-phase. Our labs therefore consist of infrastructure for the preparation and testing of thin films and devices.
“Accurate spectral response measurements of a complementary absorbing organic tandem cell with fill factor exceeding the subcells,” D. Cheyns, M. Kim, B. Verreet, B.P. Rand, Appl. Phys. Lett., 104, 093302 (2014).
“Thin film metal nanocluster light emitting devices,” B. Niesen, B.P. Rand, Adv. Mater., 26, 1446 (2014).
“Exciton dynamics in an energy upconverting solid state system based on diphenylanthracene doped with platinum octaethylporphyrin,” R. Karpicz, S. Puzinas, V. Gulbinas, A. Vakhnin, A. Kadashchuk, B.P. Rand, Chem. Phys., 429, 57 (2014).
“Role of electron- and hole-collecting buffer layers on the stability of inverted polymer: fullerene photovoltaic devices,” E. Voroshazi, I. Cardinaletti, G. Uytterhoeven, S. Li, M. Empl, T. Aernouts, B.P. Rand, IEEE J. Photovolt., 4, 265 (2014).
“Decreased recombination through the use of a non-fullerene acceptor in a 6.4% efficient organic planar heterojunction solar cell,” B. Verreet, K. Cnops, D. Cheyns, P. Heremans, A. Stesmans, G. Zango, C.G. Claessens, T. Torres, B.P. Rand, Adv. Energy Mater., 4, 1301413 (2014).
“Microcrystalline organic thin film solar cells,” B. Verreet, P. Heremans, A. Stesmans, B.P. Rand, Adv. Mater., 25, 5504 (2013).
“Structure induced conductivity enhancement in metal-doped molybdenum oxide thin films,” D. Cheyns, B. Kam, K. Vasseur, P. Heremans, B.P. Rand, J. Appl. Phys., 113, 043109 (2013).
“Improved cathode buffer layer to decrease exciton recombination in organic planar heterojunction solar cells,” B. Verreet, P.E. Malinowski, B. Niesen, D. Cheyns, P. Heremans, A. Stesmans, B.P. Rand, Appl. Phys. Lett., 102, 043301 (2013).
“Excitation of charge transfer states and low-driving force triplet exciton dissociation at planar donor/acceptor interfaces,” F. Piersimoni, D. Cheyns, K. Vandewal, J.V. Manca, B.P. Rand, J. Phys. Chem. Lett., 3, 2064 (2012).
“The impact of molecular orientation on the photovoltaic properties of a phthalocyanine/fullerene heterojunction,” B.P. Rand, D. Cheyns, K. Vasseur, N.C. Giebink, S. Mothy, Y. Yi, V. Coropceanu, D. Beljonne, J. Cornil, J.-L. Bredas, J. Genoe, Adv. Funct. Mater., 22, 2987 (2012).
“Design of transparent anodes for resonant cavity enhanced light harvesting in organic solar cells,” N.P. Sergeant, A. Hadipour, B. Niesen, D. Cheyns, P. Heremans, P. Peumans, B.P. Rand, Adv. Mater., 24, 728 (2012).
“Solution processed MoO3 thin films as a hole-injection layer for organic solar cells,” C. Girotto, E. Voroshazi, D. Cheyns, P. Heremans, B.P. Rand, ACS Appl. Mater. Interfaces, 3, 3244 (2011).