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Synthesis and Characterisations of Mixed Tellurium and Iodine Anions Based Chacolgen‐Halogen Lead Perovskite
Author(s) -
Masikini Milua,
Mkehlane Moleko Samuel,
Iwuoha Emmanuel
Publication year - 2020
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.202060376
Subject(s) - perovskite (structure) , band gap , chalcogenide , iodide , materials science , halogen , inorganic chemistry , semiconductor , chemistry , crystallography , organic chemistry , optoelectronics , alkyl
Various types of low band gap materials have been reported as suitable components for the development of solar cells. These include oxygenated amorphous silicon (a‐SiO:H) with energy bang gap ( E g =1.8–2.0 eV), kesterites ( E g =1.0–1.7 eV), and more recently perovskites ( E g =1.6–2.3 eV) which are ambipolar inorganic‐organic hybrid semiconductors. The most extensively reported perovskite is methylammonium lead (II) iodide (CH 3 NH 3 PbI 3 ) with a tetragonal crystal structure having a direct E g around 1.6 eV and the power conversion efficiency (PCE) of up to 24 %. Recently, in order to resolve simultaneously both stability and toxicity challenges raised by conventional perovskite solar cells, chalcogenide materials have fascinated attention of researchers. This work, for the first time mixed tellurium (chalcogenide) and iodine (halogen) perovskite is explored to identify novel photovoltaic absorbers that can replace conventional perovskite (CH 3 NH 3 PbI 3 ). Therefore, we present synthesis of organic‐inorganic hybrid perovskite material by means of wet chemical solution technique, by introducing during the preparation the ions of tellurium into the precursors using solvent mixture of dimethylformamide (DMF)/dimethyl sulfoxide (DMSO) at ambient temperature. The optical band gap (Eg) of CH 3 NH 3 PbI 3‐x Te x was estimated to be 1.98 eV using the Tauc plot which is within the range for an ideal perovskite. The high band gap obtained makes the material as an interesting candidate for multijunction solar cells. Though, more need to be done in term of synthesis, film making and an exact tuning of the band gap.