4. Charge Excitation

[@DDDelgado]

The way he explains band gap is extremly easy to understand. I have done a few courses and finally.

[@DDDelgado]

38:00 why thermalization or excited electron relaxation justifies the use of thermoelectric ideas such as thermocouples, because the delta T is quite low.

[@DDDelgado]

58:00 the explanation of maximum efficiency for single junction cell. 31%.

[@vahidmirkhani]

20:37 The exp(-ik.r) is the planewave function which oscillates. As a matter of fact, it's a spherical planewave function, which at infinity (away from its origin) becomes planar (Cartesian).

[@romanibukharst9517]

Thanks MIT, Thanks Prof Tonio Buonassisi

[@stormynite6]

Ref: 32:00. Woods are insulators, so must be having large bad gaps. Meaning, it would not absorb sun radiation at all. Hence woods should be transparent to the sunlight?

[@manubhadoria24]

+Stormynite6 Materials don't need to be transparent to have large band gaps.

[@joamarticorena9018]

Good question, don’t know the answer

[@brainstormingsharing1309]

Absolutely well done and definitely keep it up!!! 👍👍👍👍👍

[@getchased8997]

Thank you, MIT 👌🏼

[@joamarticorena9018]

Excellent videos! I have a question, UV photons have 100 eV, an energy higher than Silicon work function (4.85 eV), would that light generate photoelectric effect? Which means that the electron absorbes energy enough to separate from the nucleus of the atom

[@deshithadhananjaya3122]

thank you MIT

[@muhammadafifhidayat2566]

Hard topic 😂