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Investigating Charge Dynamics in Halide Perovskite Sensitized Mesostructured Solar Cells

Published online by Cambridge University Press:  21 July 2014

Andrea Listorti*
Affiliation:
Center for Bio-Molecular Nanotechnology, Fondazione Istituto Italiano di Tecnologia, Via Barsanti, 73010 Arnesano (Lecce), Italy NNL − National Nanotechnology Laboratory, CNR Istituto Nanoscienze, Distretto Tecnologico, Via Arnesano 16, 73100 Lecce, Italy
Vittoria Roiati
Affiliation:
Center for Bio-Molecular Nanotechnology, Fondazione Istituto Italiano di Tecnologia, Via Barsanti, 73010 Arnesano (Lecce), Italy Department of Physics, Politecnico di Milano, p.zza Leonardo da Vinci 32, Milano, Italy Center for Nano Science and Technology@Polimi, Istituto Italiano di Tecnologia, Via G. Pascoli 70/3, 20133 Milano, Italy
Silvia Colella
Affiliation:
NNL − National Nanotechnology Laboratory, CNR Istituto Nanoscienze, Distretto Tecnologico, Via Arnesano 16, 73100 Lecce, Italy
Edoardo Mosconi
Affiliation:
Computational Laboratory for Hybrid/Organic Photovoltaics (CLHYO), CNR-ISTM, Via Elce di Sotto 8, Perugia I-06123, Italy
Giovanni Lerario
Affiliation:
Center for Bio-Molecular Nanotechnology, Fondazione Istituto Italiano di Tecnologia, Via Barsanti, 73010 Arnesano (Lecce), Italy
Luisa De Marco
Affiliation:
Center for Bio-Molecular Nanotechnology, Fondazione Istituto Italiano di Tecnologia, Via Barsanti, 73010 Arnesano (Lecce), Italy
Aurora Rizzo
Affiliation:
Center for Bio-Molecular Nanotechnology, Fondazione Istituto Italiano di Tecnologia, Via Barsanti, 73010 Arnesano (Lecce), Italy NNL − National Nanotechnology Laboratory, CNR Istituto Nanoscienze, Distretto Tecnologico, Via Arnesano 16, 73100 Lecce, Italy
Filippo De Angelis
Affiliation:
Computational Laboratory for Hybrid/Organic Photovoltaics (CLHYO), CNR-ISTM, Via Elce di Sotto 8, Perugia I-06123, Italy
Giuseppe Gigli
Affiliation:
Center for Bio-Molecular Nanotechnology, Fondazione Istituto Italiano di Tecnologia, Via Barsanti, 73010 Arnesano (Lecce), Italy NNL − National Nanotechnology Laboratory, CNR Istituto Nanoscienze, Distretto Tecnologico, Via Arnesano 16, 73100 Lecce, Italy Dipartimento di Matematica e Fisica “E. De Giorgi”, Universita’ del Salento, Via per Arnesano, 73100 Lecce, Italy
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Abstract

Charge generation and transport in CH3NH3PbI3-xClx based mesostructured solar cells are investigated. Time correlated single photon counting analysis proves highly efficient charge generation and provides insights on the structural properties of perovskite films. Photoinduced absorption and transient photovoltage analyses depict a double charge recombination dynamics suggesting the existence of two complementary paths for electron transport, involving either TiO2 and perovskite matrixes. Stark spectroscopy, a powerful tool allowing interface-sensitive analysis, is employed to prove the existence of oriented permanent dipoles, consistent with the hypothesis of an ordered perovskite layer close to the oxide surface. This evidence is also confirmed by first principle DFT calculations. The existence of a structural order, promoted by specific local interactions, could be one of the decisive reasons for highly efficient carriers transport within perovskite films.

Type
Articles
Copyright
Copyright © Materials Research Society 2014 

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References

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