Materials such as hybrid organic-inorganic perovskites, self-assembled molecular crystals, and conjugated polymers can demonstrate anomalously long excitonic diffusion. We seek to characterize and optimize these materials through an iterative combination of synthesis and spectrosocpy. In the laboratory, we probe the initial femtosecond dynamics after excitation and follow the fate of the carriers and excitons through the nanosecond (or hundreds of nanosecond) timescale.
L. Wang, N.E. Williams, E.W. Malachosky, J.P. Otto, D. Hayes, R.E. Wood, P. Guyot-Sionnest, and G.S. Engel, "Scalable Ligand-Mediated Transport Synthesis of Organic-Inorganic Hybrid Perovskite Nanocrystals with Resolved Electronic Structure and Ultrafast Dynamics" ACS Nano 11, 2689–2696 2017.
C. She, I. Fedin, D.S. Dolzhnikov, P.D. Dahlberg, G.S. Engel, R.D. Schaller, D.V. Talapin, "Red, Yellow, Green, and Blue Amplified Spontaneous Emission and Lasing Using Colloidal CdSe Nanoplatelets" ACS Nano. 9, 9475–9485 2015.
Y. Zhang, S. Oh, F.H. Alharbi, G.S. Engel, and S. Kais, "Delocalized quantum states enhance photocell efficiency" Phys. Chem. Chem. Phys. 17, 5743-5750 2015.
J.R. Caram, H. Zheng, P.D. Dahlberg, B.S. Rolczynski, G.B. Griffin, D.S. Dolzhnikov, D.V. Talapin, and G.S. Engel, "Exploring size and state dynamics in CdSe quantum dots using two-dimensional electronic spectroscopy" J. Chem. Phys. 140, 084701 2014.
G.B. Griffin, P.M. Lundin, B.S. Rolczynski, A. Linkin, R.D. McGillicuddy, Z.Bao, and G.S. Engel, "Ultrafast energy transfer from rigid, branched side-chains into a conjugated, alternating copolymer" J. Chem. Phys. 140, 034903 2014.