R
Raja Ghosh
Researcher at University of California, San Diego
Publications - 20
Citations - 612
Raja Ghosh is an academic researcher from University of California, San Diego. The author has contributed to research in topics: Polaron & Chemistry. The author has an hindex of 8, co-authored 16 publications receiving 371 citations. Previous affiliations of Raja Ghosh include Temple University & Indian Institute of Science Education and Research, Thiruvananthapuram.
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Journal ArticleDOI
The Effects of Crystallinity on Charge Transport and the Structure of Sequentially Processed F4TCNQ-Doped Conjugated Polymer Films
D. Tyler Scholes,Patrick Y. Yee,Jeffrey Lindemuth,Hyeyeon Kang,Jonathan W. Onorato,Raja Ghosh,Christine K. Luscombe,Frank C. Spano,Sarah H. Tolbert,Benjamin J. Schwartz +9 more
TL;DR: In this article, the properties of molecularly doped films of conjugated polymers are explored as the crystallinity of the polymer is systematically varied using Solution Sequential Processing (SqP) to introduce 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) into poly(3-hexylthiophene-2,5-diyl) (P3HT).
Journal ArticleDOI
Polaron Delocalization in Conjugated Polymer Films
TL;DR: In this article, a theory describing the spatial coherence length of polarons in disordered conjugated polymer films is presented, revealing a simple relationship between oscillator strength of the mid-IR absorption band and the polaron coherence function.
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Sequential Doping Reveals the Importance of Amorphous Chain Rigidity in Charge Transport of Semi-Crystalline Polymers
TL;DR: A combination of infrared spectroscopy and theoretical simulations shows that the dopants selectively placed in the amorphous regions in the film via sequential doping result in highly localized polarons, increasing film connectivity and hence improving the overall conductivity of the film compared with the conventional doping processes.
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Spectral Signatures and Spatial Coherence of Bound and Unbound Polarons in P3HT Films: Theory Versus Experiment
Raja Ghosh,Annabel R. Chew,Jonathan W. Onorato,Viktoria Pakhnyuk,Christine K. Luscombe,Alberto Salleo,Frank C. Spano +6 more
TL;DR: In this article, the origin of the mid-infrared spectral features for hole absorption in doped poly(3-hexylthiophene) (P3HT) films is investigated theoretically and experimentally using a Holstein-style Hamil...
Journal ArticleDOI
Excitons and Polarons in Organic Materials.
Raja Ghosh,Frank C. Spano +1 more
TL;DR: In this article, the authors compare the spectral properties of excitons and polarons in a generic linear array of coupled units as a model host for both quasiparticles, with a particular emphasis on the spatial coherence length, the length over which an exciton or polaron possesses wave-like properties.