Symbols
${\mathrm{C}}_{\mathrm{v}}$	Specific Heat at constant volume
${\mathrm{C}}_{\mathrm{P}}$	The specific heat
${\mathrm{D}}_{\mathrm{T}}$	Thermal diffusivity
e	Carrier charge
I	Current
Isc	Short circuit current
$\mathrm{E}$	Electron energy
${\mathrm{E}}_{\mathrm{f}}$	Electron energy at the Fermi level
$\mathrm{g}\left(\mathrm{E}\right)$	The density of states
$\mathrm{f}\left(\mathrm{E}\right)$	Fermi function
$\mathrm{h}$	Planck’s constant
$\mathrm{k}$	Thermal conductivity (W/m·K)
${\mathrm{k}}_{\mathrm{e}}$	Electron thermal conductivity
${\mathrm{k}}_{\mathrm{l}}$	Lattice thermal conductivity
${\mathrm{K}}_{\mathrm{B}}$	Boltzmann constant
L	Lorenz number
l	Phonons mean free path
𝑛	Carrier density
${\mathrm{N}}_{\mathrm{v}}$	Valley degeneracy
𝑁𝑚*	Effective mass
m𝑣b*	Band-mass
QH	Thermal energy (hot side) (J)
S	Seebeck coefficient
T	Temperature (K)
Tc	The temperature on the cold side
Th	The temperature on the hot side
V	Voltage (V)
Voc	The open circuit voltage
W	Power generated (W)
$\mathrm{v}$	Average Sound velocity
σ	Electrical conductivity (S/m)
$\mathsf{\sigma }\left(\mathrm{E}\right)$	Electronic conductivity specified in terms of the Fermi energy
η	Energy conversion efficiency
μ	Carrier mobility
$\mathsf{\rho }$	Mass density
Abbreviations
AAO	anodic aluminium oxide
CNT	Carbon nanotube
MWCNT	Multi-wall carbon nanotube
NWs	Nanowires
PANI	Polyaniline
PEDOT: PSS	Poly(3,4-ethylenedioxythiophene): poly (styrene sulfonate)
PDLC	Polymer-dispersed liquid crystals
PGEC	Phonon glass electron crystal
PTENG	Photo-Thermoelectric Nanogenerator
rGO	Reduced graphene oxide
TCOs	Transparent conductive oxides
TCM	Thermochromic materials
TC	Transition temperature
TE	Thermoelectric
TEGs	Thermoelectric generators
TENG	Thermoelectric nanogenerator
SWCNT	Single-wall carbon nanotube
ZT	Figure of merit
1D	One-dimensional