On solving \(\phi=0.61 eV\)
$\left\lfloor{m}_{e}=\text { mass of electron }=9 \times 10^{-31} \,{kg}\right.$
${h}=\text { Planck constant }=6.6 \times 10^{-34} {Js}$
$\left.{k}_{{B}}=\text { Boltzmann constant }=1.38 \times 10^{-23}\, {JK}^{-1}\right]$