ERef Bayreuth

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Effect of Thermal and Structural Disorder on the Electronic Structure of Hybrid Perovskite Semiconductor CH₃NH₃PbI₃

Title data

Singh, Shivam ; Li, Cheng ; Panzer, Fabian ; Narasimhan, K. L. ; Gräser, Anna ; Gujar, Tanaji P. ; Köhler, Anna ; Thelakkat, Mukundan ; Hüttner, Sven ; Kabra, Dinesh:
Effect of Thermal and Structural Disorder on the Electronic Structure of Hybrid Perovskite Semiconductor CH₃NH₃PbI₃.
In: The Journal of Physical Chemistry Letters. Vol. 7 (2016) . - pp. 3014-3021.
ISSN 1948-7185
DOI: https://doi.org/10.1021/acs.jpclett.6b01207

Abstract in another language

In this Letter, we investigate the temperature dependence of the optical properties of methylammonium lead iodide (MAPbI3 = CH3NH3PbI3) from room temperature to 6 K. In both the tetragonal (T > 163 K) and the orthorhombic (T < 163 K) phases of MAPbI3, the band gap (from both absorption and photoluminescence (PL) measurements) decreases with decrease in temperature, in contrast to what is normally seen for many inorganic semiconductors, such as Si, GaAs, GaN, etc. We show that in the perovskites reported here, the temperature coefficient of thermal expansion is large and accounts for the positive temperature coefficient of the band gap. A detailed analysis of the exciton line width allows us to distinguish between static and dynamic disorder. The low-energy tail of the exciton absorption is reminiscent of Urbach absorption. The Urbach energy is a measure of the disorder, which is modeled using thermal and static disorder for both the phases separately. The static disorder component, manifested in the exciton line width at low temperature, is small. Above 60 K, thermal disorder increases the line width. Both these features are a measure of the high crystal quality and low disorder of the perovskite films even though they are produced from solution.

Further data

Item Type:	Article in a journal
Refereed:	Yes
Institutions of the University:	Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics II - Optoelectronics of Soft Matter > Chair Experimental Physics II - Optoelectronics of Soft Matter - Univ.-Prof. Dr. Anna Köhler Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry I Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors > Junior Professor Solar Energy - Juniorprof. Dr. Sven Hüttner Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Professor Applied Functional Polymers > Professor Applied Functional Polymers - Univ.-Prof. Dr. Mukundan Thelakkat Graduate Schools > Bayreuth Graduate School of Mathematical and Natural Sciences (BayNAT) > Photophysics of Synthetic and Biological Multichromophoric Systems Faculties Faculties > Faculty of Mathematics, Physics und Computer Science Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics II - Optoelectronics of Soft Matter Faculties > Faculty of Biology, Chemistry and Earth Sciences Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Junior Professor Solar Energy Graduate Schools Graduate Schools > Bayreuth Graduate School of Mathematical and Natural Sciences (BayNAT) Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Professor Applied Functional Polymers Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors
Result of work at the UBT:	Yes
DDC Subjects:	500 Science > 530 Physics
Date Deposited:	27 Jul 2016 13:11
Last Modified:	27 Jul 2016 13:11
URI:	https://eref.uni-bayreuth.de/id/eprint/33667