Solar Cells, 2nd Edition

Appendix A

Constants, Physical Quantities, and Conversion Factors

Tom Markvart, Augustin McEvoy and Luis Castañer

Name	Symbol	Value
Astronomical unit (mean distance between the Sun and Earth)	RSE	1.496×1011 m
Avogadro’s number	NAv	6.023×1023 molecules/mol
Boltzmann constant	kB	1.381×10−25 J/K
Electron charge	q	1.602×10−19 C
Electronvolt	eV	1.602×10−19 J
Energy of 1 μm photon	1.240 eV
Free electron mass	m0	9.109×10−31 kg
Permitivity of free space	ε0 = 107/4πc2	8.854×10−12 F/m
Permeability of free space	μ0 = 4π 10−7	1.257×10−6 H/m
Plank’s constant	h	6.625×10−34 J.s
ħ = h/2π	1.055×10−31 J.s
Radius of the Sun	Rs	6.96×108 m
Thermal voltage at 300 K	VT = kBT/q	25.9 mV
Solid angle subtended by the Sun	ωs	6.85×10−5 sterad
fω = ω ...