Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First principle studies on the optoelectronic properties of rubidium
  lead halides   Entirely inorganic perovskites have attracted enormous attention of late
owing to their outstanding applications in optoelectronics including highly
stable perovskite solar cells. In-depth understanding of the optoelectronic and
transport properties of such materials are vital for practical implementation
of the same. The carrier transport properties of the electronic devices based
on perovskite materials significantly depend on the effective mass of the
respective charge carriers. Here, we have performed first principle
calculations with FP-LAPW method for the orthorhombic rubidium lead halide
structures (\ch{RbPbX_3}, where \ch{X=I,Br,Cl}) to study the optoelectronic and
transport properties. The effective mass of electron (hole) is found to be
minimum for \ch{RbPbBr_3} (\ch{RbPbI_3}), suggesting an efficient transport of
electrons (holes) in the corresponding materials. Our calculated values such as
the dielectric constants, refractive indices, absorption coefficients and
reflectivities show good agreement with reported experimental data. To the best
of our knowledge, ab-initio study of electronic and optical properties of
\ch{RbPbBr_3} \& \ch{RbPbCl_3} in orthorhombic phase (\ch{NH_4CdCl_3} type
structure) is reported for the first time.

29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin