title: Temperature-Induced Lattice Relaxation of Perovskite Crystal Enhances Optoelectronic Properties and Solar Cell Performance.
abstract: Hybrid organic-inorganic perovskite crystals have recently become one of the most important classes of photoactive materials in the solar cell and optoelectronic communities. Albeit improvements have focused on state-of-the-art technology including various fabrication methods, device architectures, and surface passivation, progress is yet to be made in understanding the actual operational temperature on the electronic properties and the device performances. Therefore, the substantial effect of temperature on the optoelectronic properties, charge separation, charge recombination dynamics, and photoconversion efficiency are explored. The results clearly demonstrated a significant enhancement in the carrier mobility, photocurrent, charge carrier lifetime, and solar cell performance in the 60 ± 5 °C temperature range. In this temperature range, perovskite crystal exhibits a highly symmetrical relaxed cubic structure with well-aligned domains that are perpendicular to a principal axis, thereby remarkably improving the device operation. This finding provides a new key variable component and paves the way toward using perovskite crystals in highly efficient photovoltaic cells.
authors.affiliation: King Abdullah University of Science and Technology , KAUST Solar Center, Division of Physical Sciences and Engineering, Thuwal 23955-6900, Kingdom of Saudi Arabia.
authors.forename: Banavoth
authors.identifier: http://orcid.org/0000-0002-7806-2274
authors.initials: B
authors.lastname: Murali
authors.affiliation: King Abdullah University of Science and Technology , KAUST Solar Center, Division of Physical Sciences and Engineering, Thuwal 23955-6900, Kingdom of Saudi Arabia.
authors.forename: Emre
authors.identifier: http://orcid.org/0000-0001-7208-4803
authors.initials: E
authors.lastname: Yengel
authors.affiliation: King Abdullah University of Science and Technology , KAUST Solar Center, Division of Physical Sciences and Engineering, Thuwal 23955-6900, Kingdom of Saudi Arabia.
authors.forename: Wei
authors.initials: W
authors.lastname: Peng
authors.affiliation: King Abdullah University of Science and Technology , Functional Materials Design, Discovery and Development Research Group, Advanced Membranes and Porous Materials Center, Thuwal 23955-6900, Kingdom of Saudi Arabia.
authors.forename: Zhijie
authors.initials: Z
authors.lastname: Chen
authors.affiliation: King Abdullah University of Science and Technology , Photonics Laboratory, Computer, Electrical and Mathematical Sciences and Engineering Division, Thuwal 23955-6900, Kingdom of Saudi Arabia.
authors.forename: Mohd S
authors.identifier: http://orcid.org/0000-0003-1369-1421
authors.initials: MS
authors.lastname: Alias
authors.affiliation: King Abdullah University of Science and Technology , KAUST Solar Center, Division of Physical Sciences and Engineering, Thuwal 23955-6900, Kingdom of Saudi Arabia.
authors.forename: Erkki
authors.initials: E
authors.lastname: Alarousu
authors.affiliation: King Abdullah University of Science and Technology , Photonics Laboratory, Computer, Electrical and Mathematical Sciences and Engineering Division, Thuwal 23955-6900, Kingdom of Saudi Arabia.
authors.forename: Boon S
authors.initials: BS
authors.lastname: Ooi
authors.affiliation: Mathematical Institute, University of Oxford , Woodstock Road, Oxford OX2 6GG, United Kingdom.
authors.forename: Victor
authors.initials: V
authors.lastname: Burlakov
authors.affiliation: Mathematical Institute, University of Oxford , Woodstock Road, Oxford OX2 6GG, United Kingdom.
authors.forename: Alain
authors.initials: A
authors.lastname: Goriely
authors.affiliation: King Abdullah University of Science and Technology , Functional Materials Design, Discovery and Development Research Group, Advanced Membranes and Porous Materials Center, Thuwal 23955-6900, Kingdom of Saudi Arabia.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Eddaoudi
authors.affiliation: King Abdullah University of Science and Technology , KAUST Solar Center, Division of Physical Sciences and Engineering, Thuwal 23955-6900, Kingdom of Saudi Arabia.
authors.forename: Osman M
authors.identifier: http://orcid.org/0000-0002-3428-1002
authors.initials: OM
authors.lastname: Bakr
authors.affiliation: King Abdullah University of Science and Technology , KAUST Solar Center, Division of Physical Sciences and Engineering, Thuwal 23955-6900, Kingdom of Saudi Arabia.
authors.forename: Omar F
authors.identifier: http://orcid.org/0000-0001-8500-1130
authors.initials: OF
authors.lastname: Mohammed