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Band Gap Tuning of CH3NH3Pb(Br1-xClx)(3) Hybrid Perovskite for Blue Electroluminescence

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Title Band Gap Tuning of CH3NH3Pb(Br1-xClx)(3) Hybrid Perovskite for Blue Electroluminescence
 
Creator KUMAWAT, NK
DEY, A
KUMAR, A
GOPINATHAN, SP
NARASIMHAN, KL
KABRA, D
 
Subject LIGHT-EMITTING-DIODES
ORGANOMETAL HALIDE PEROVSKITE
SOLAR-CELLS
THIN-FILMS
LOW-COST
EFFICIENT
DEPOSITION
LAYER
PHOTOLUMINESCENCE
NANOWIRES
perovskite
bandgap tuning
Bowing parameter
Urbach energy
Sommerfield factor
Blue-PeLED
 
Description We report on the structural, morphological and optical properties of AB(Br1-xClx)(3) (where, A = CH3NH3+, B = Pb2+ and x = 0 to 1) perovskite semiconductor and their successful demonstration in green and blue emissive perovskite light emitting diodes at room temperature. The bandgap of perovskite thin film is tuned from 2.42 to 3.16 eV. The Onset of optical absorption is dominated by excitonic effects. The coulomb field of the exciton influences the absorption at the band edge. Hence, it is necessary to explicitly account for the enhancement of the absorption through the Sommerfield factor. This enables us to correctly extract the exciton binding energy and the electronic bandgap. We also show that the lattice constant varies linearly with the fractional chlorine content satisfying Vegards law.
 
Publisher AMER CHEMICAL SOC
 
Date 2016-01-15T06:16:57Z
2016-01-15T06:16:57Z
2015
 
Type Article
 
Identifier ACS APPLIED MATERIALS & INTERFACES, 7(24)13119-13124
1944-8244
http://dx.doi.org/10.1021/acsami.5b02159
http://dspace.library.iitb.ac.in/jspui/handle/100/17910
 
Language en