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Browsing MIT Open Access Articles by Author "Bulovic, Vladimir"

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Browsing MIT Open Access Articles by Author "Bulovic, Vladimir"

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  • Ryu, Kevin K.; Nausieda, Ivan A.; He, David Da; Akinwande, Akintunde Ibitayo; Bulovic, Vladimir; Sodini, Charles G. (Institute of Electrical and Electronics Engineers, 2010-04)
    The effects of bias stress in integrated pentacene organic transistors are studied and modeled for different stress conditions. It is found that the effects of bias stress can be expressed in terms of the shift in applied ...
  • Barr, Miles C.; Carbonera, Chiara; Po, Riccardo; Gleason, Karen K.; Bulovic, Vladimir (American Institute of Physics (AIP), 2012-04)
    Vacuum and solution processed versions of poly(3,4-ethylenedioxythiophene) (PEDOT) are used as cathode interlayers in inverted organic photovoltaic cells comprising tetraphenyldibenzoperiflanthene as the electron donor and ...
  • Yu, Tony S.; Bulovic, Vladimir; Hosoi, A. E. (Cambridge University Press, 2013-04)
    We examine solidification in thin liquid films produced by annealing amorphous Alq[subscript 3] (tris-(8-hydroxyquinoline) aluminium) in methanol vapour. Micrographs acquired during annealing capture the evolution of the ...
  • Bulovic, Vladimir; Tischler, Jonathan R.; Young, Elizabeth Renee; Nocera, Daniel G. (Institute of Electrical and Electronics Engineers, 2009-08)
    Lowest reported threshold organic semiconductor VCSEL (4.9 muJ/cm[superscript 2]) is achieved when excitons coherently couple, upon sub-picosecond non-resonant optical excitation. Temperature dependence of lambda/2 n device, ...
  • Han, Ggoch Ddeul; Collins, William R.; Andrew, Trisha L.; Bulovic, Vladimir; Swager, Timothy Manning (Wiley Blackwell, 2013-01)
    New tetraalkylcyclobutadiene–C[subscript 60] adducts are developed via Diels–Alder cycloaddition of C[subscript 60] with in situ generated cyclobutadienes. The cofacial π-orbital interactions between the fullerene orbitals ...
  • Sodini, Charles G.; Nausieda, Ivan A.; Ryu, Kevin K.; He, David Da; Akinwande, Akintunde Ibitayo; Bulovic, Vladimir (Institute of Electrical and Electronics Engineers, 2009-12)
    For the first time, we demonstrate control of organic thinfilm transistor's (OTFT) threshold voltage (V [subscript T]) by modifying the gate work function. We present a near-room-temperature, fully lithographic process to ...
  • Nausieda, Ivan A.; Ryu, Kevin K.; He, David Da; Akinwande, Akintunde Ibitayo; Bulovic, Vladimir; Sodini, Charles G. (Institute of Electrical and Electronics Engineers, 2010-11)
    A fully photolithographic dual threshold voltage (VT) organic thin-film transistor (OTFT) process suitable for flexible large-area integrated circuits is presented. The nearroom-temperature (<; 95 °C) process produces ...
  • Bulovic, Vladimir; Tischler, Jonathan R.; Young, Elizabeth Renee; Bradley, Michael Scott; Nocera, Daniel G.; Akselrod, Gleb Markovitch (Institute of Electrical and Electronics Engineers, 2009-08)
    Sublinear intensity dependence of photoluminescence from organic exciton-polariton microcavities under non-resonant excitation in two power regimes is shown. The sublinearity is attributed to exciton-exciton annihilation, ...
  • Lobez, Jose M.; Andrew, Trisha Lionel; Bulovic, Vladimir; Swager, Timothy Manning (American Chemical Society, 2012-02)
    The motivation of this study is to determine if small amounts of designer additives placed at the polymer–fullerene interface in bulk heterojunction (BHJ) solar cells can influence their performance. A series of AB-alternating ...
  • He, David Da; Nausieda, Ivan A.; Ryu, Kevin K.; Akinwande, Akintunde Ibitayo; Bulovic, Vladimir; Sodini, Charles G. (Institute of Electrical and Electronics Engineers, 2010-02)
    An integrated organic temperature-sensing circuit array compatible with flexible and large-area substrates is presented. The array outputs an average value of 6.8 mV/A[over-carat][degree symbol]C, which is 22A[over-tilde] ...
  • Bulovic, Vladimir; Bradley, Michael Scott (American Physical Society, 2010-07)
    We demonstrate intracavity optical pumping of J-aggregate microcavity exciton polaritons. The use of ultrathin layer-by-layer J-aggregate thin films as the strongly coupled exciton medium allows for inclusion of a thermally ...
  • Young, Elizabeth R.; Bradley, M. Scott; Akselrod, Gleb Markovitch; Bulovic, Vladimir (Optical Society of America, 2013-05)
    We demonstrate room temperature lasing through the polaritonic mode of a J-aggregate microcavity in which losses from exciton-exciton annihilation and slow polariton relaxation typical of direct J-aggregate excitation are ...
  • Osedach, Tim Paul; Geyer, Scott Mitchell; Ho, John C.; Arango, Alexi C.; Bawendi, Moungi G.; Bulovic, Vladimir (American Institute of Physics, 2009-01)
    We demonstrate a heterojunction photodetector of lateral geometry that utilizes an evaporated film of the hole-transporting molecular material N,N′-bis(3-methylphenyl)-N,N′-bis(phenyl)-9,9-spirobifluorene (spiro-TPD) as a ...
  • Sodini, Charles G.; Bulovic, Vladimir; Akinwande, Akintunde Ibitayo; Wang, Annie I.; Yaglioglu, Burag (Institute of Electrical and Electronics Engineers, 2009-12)
    We report a low temperature ( ~ 100à °C) lithographic method for fabricating hybrid metal oxide/organic field-effect transistors (FETs) that combine a zinc-indium-oxide (ZIO) semiconductor channel and organic, parylene, ...
  • Bulovic, Vladimir; Anikeeva, Polina; Panzer, Matthew J.; Wood, Vanessa Claire; Hummon, M. R.; Stollenwerk, A. J.; Narayanamurti, V. (American Physical Society, 2010-03)
    We use a scanning tunneling microscope to probe single-electron charging phenomena in individual CdSe/ZnS (core/shell) quantum dots (QDs) at room temperature. The QDs are deposited on top of a bare Au thin film and form a ...
  • Hummon, M. R.; Stollenwerk, A. J.; Narayanamurti, V.; Anikeeva, Polina; Panzer, Matthew J.; Wood, Vanessa Claire; Bulovic, Vladimir (American Physical Society, 2010-03)
    We use a scanning tunneling microscope to probe single-electron charging phenomena in individual CdSe/ZnS (core/shell) quantum dots (QDs) at room temperature. The QDs are deposited on top of a bare Au thin film and form a ...
  • Walker, Brian J.; Nair, Gautham P.; Marshall, Lisa F.; Bawendi, Moungi G.; Bulovic, Vladimir (American Chemical Society (ACS), 2009-06)
    We report narrow-band absorption enhancement of semiconductor nanocrystals via Förster resonance energy transfer from cyanine J-aggregates. These J-aggregated dyes associate electrostatically with short quantum-dot (QD) ...
  • Osedach, Timothy P.; Iacchetti, Antonio; Lunt, Richard R.; Andrew, Trisha L.; Brown, Patrick Richard; Akselrod, Gleb Markovitch; Bulovic, Vladimir (American Institute of Physics (AIP), 2012-09)
    We demonstrate a near-infrared photodetector that consists of a thin film of the J-aggregating cyanine dye, U3, and transparent metal-oxide charge transport layers. The high absorption coefficient of the U3 film, combined ...
  • Bradley, Michael Scott; Bulovic, Vladimir (Institute of Electrical and Electronics Engineers (IEEE), 2010-07)
    We present a measurement of the lower-branch exciton-polariton occupation in room-temperature J-aggregate microcavity devices under low-density steady-state excitation. The observed occupation follows a Maxwell-Boltzmann ...
  • Mei, Jun; Bradley, Michael Scott; Bulovic, Vladimir (American Physical Society, 2009-06)
    We report a comprehensive study of photoluminescence (PL) quenching of tris-(8-hydroxyquinoline) aluminum (Alq[subscript ]3) at interfaces with thin films of tin oxide (SnO[subscript 2]) using both steady-state and ...
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