S
Sergei Tretiak
Researcher at Los Alamos National Laboratory
Publications - 475
Citations - 28719
Sergei Tretiak is an academic researcher from Los Alamos National Laboratory. The author has contributed to research in topics: Excited state & Density functional theory. The author has an hindex of 73, co-authored 415 publications receiving 23905 citations. Previous affiliations of Sergei Tretiak include European University of Brittany & University of Central Florida.
Papers
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Journal ArticleDOI
High-efficiency solution-processed perovskite solar cells with millimeter-scale grains
Wanyi Nie,Hsinhan Tsai,Reza Asadpour,Jean-Christophe Blancon,Amanda Neukirch,Gautam Gupta,Jared Crochet,Manish Chhowalla,Sergei Tretiak,Muhammad A. Alam,Hsing-Lin Wang,Aditya D. Mohite +11 more
TL;DR: A solution-based hot-casting technique is demonstrated to grow continuous, pinhole-free thin films of organometallic perovskites with millimeter-scale crystalline grains that are applicable to several other material systems plagued by polydispersity, defects, and grain boundary recombination in solution-processed thin films.
Journal ArticleDOI
High-efficiency two-dimensional Ruddlesden–Popper perovskite solar cells
Hsinhan Tsai,Hsinhan Tsai,Wanyi Nie,Jean-Christophe Blancon,Constantinos C. Stoumpos,Reza Asadpour,Boris Harutyunyan,Amanda Neukirch,Rafael Verduzco,Jared Crochet,Sergei Tretiak,Laurent Pedesseau,Jacky Even,Muhammad A. Alam,Gautam Gupta,Jun Lou,Pulickel M. Ajayan,Michael J. Bedzyk,Mercouri G. Kanatzidis,Aditya D. Mohite +19 more
TL;DR: Thin films of near-single-crystalline quality are produced, in which the crystallographic planes of the inorganic perovskite component have a strongly preferential out-of-plane alignment with respect to the contacts in planar solar cells to facilitate efficient charge transport.
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Extremely efficient internal exciton dissociation through edge states in layered 2D perovskites
Jean-Christophe Blancon,Hsinhan Tsai,Hsinhan Tsai,Wanyi Nie,Costas C. Stoumpos,Laurent Pedesseau,Claudine Katan,Mikael Kepenekian,Chan Myae Myae Soe,Kannatassen Appavoo,Matthew Y. Sfeir,Sergei Tretiak,Pulickel M. Ajayan,Mercouri G. Kanatzidis,Jacky Even,John Jared Crochet,Aditya D. Mohite +16 more
TL;DR: It is reported that, counterintuitive to classical quantum-confined systems where photogenerated electrons and holes are strongly bound by Coulomb interactions or excitons, the photophysics of thin films made of Ruddlesden-Popper perovskites with a thickness exceeding two perovkite-crystal units is dominated by lower-energy states associated with the local intrinsic electronic structure of the edges of the perovSKite layers.
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Spectrally resolved dynamics of energy transfer in quantum-dot assemblies: towards engineered energy flows in artificial materials.
TL;DR: Time-resolved and spectrally resolved photoluminescence directly reveals the energy-dependent transfer rate of excitons from smaller to larger dots via electrostatic coupling, and suggests that interdot energy transfer can approach picosecond time scales in structurally optimized systems.
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Light-activated photocurrent degradation and self-healing in perovskite solar cells
Wanyi Nie,Jean-Christophe Blancon,Amanda Neukirch,Kannatassen Appavoo,Hsinhan Tsai,Manish Chhowalla,Muhammad A. Alam,Matthew Y. Sfeir,Claudine Katan,Jacky Even,Sergei Tretiak,Jared Crochet,Gautam Gupta,Aditya D. Mohite +13 more
TL;DR: It is shown that the slow photocurrent degradation in thin-film photovoltaic devices is due to the formation of light-activated meta-stable deep-level trap states, and the creation of small polaronic states involving localized cooperative lattice strain and molecular orientations emerges as a credible microscopic mechanism requiring further detailed studies.