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This Week's Colloquium: Maria Loi, Nov. 15, 2012

Maria Loi
Photophysics & Optoelectronics
Zernike Institute for Advanced Materials
University of Groningen, Groningen, The Netherlands

Thursday, Nov. 15, 2012
102 JFB

Refreshments: 3:30 pm in 219 JFB
Lecture 4:00pm (102 JFB)

Title: Organic-Inorganic Hybrids: From Fundamental Properties To Optoelectronic Devices


Colloidal semiconductor nanocrystals (NCs) are solution processable semiconductors that are potentially highly appropriate for optoelectronic device fabrication, owing to their narrow bandwidth, their remarkably broad absorption, their large tunability, their high dielectric constant, and their high stability under ambient conditions. In spite of the interest drawn by these systems their successful application in optoelectronic devices have been limited. Most of the problems reside in the dichotomy between quantum confinement and the necessity of electronic wave function overlap to allow electrical transport. This problem is enhanced by the insulating nature of the organic ligands used to passivate and solubilize the NCs. Recently several authors have reported that the use of small conjugated ligands is a way to overcome these problems. I will report how PbS NCs with benzene dithiols ligands can be use as active layer for efficient solar cells, [1] with power conversion efficiencies approaching 4% and fill factors of 60% under AM1.5 illumination. The effect of different NCs` size on the performance and key parameters of the devices will be discussed together with peculiar features of the device functioning [2]. Finally I will discuss as PbS NCs together with conjugated polymers can give new possibility towards broad absorption of the solar spectrum.[3]

[1] K. Szendrei, W. Gomulya, M. Yarema, W. Heiss and M. A. Loi, Appl. Phys. Lett. 97, 203501 (2010).
[2] K. Szendrei, M. Speirs, W. Gomulya, D. Jarzab, M. Manca, O. V. Mikhnenko, M. Yarema, B. J. Kooi, W. Heiss, and M. A. Loi, Adv. Funct. Mater. 22, 1598 (2012).
[3] C. Piliego, M. Manca, R. Kroon, M. Yarema, K. Szendrei, M. Andersson, W. Heiss and M. A. Loi, J. Mater. Chem., J. Mater. Chem., 22, 24411 (2012).

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