(resolved) Seebeck effect: why can't electron+hole combine at cold end?

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SUMMARY

The discussion centers on the Seebeck effect, specifically addressing why electrons and holes do not recombine at the cold end of a thermoelectric material. When the hot region is heated, charge carriers migrate towards the cooler area, creating a potential difference. The inquiry focuses on the recombination of these carriers at the cold end rather than traveling through the entire circuit, which is essential for generating usable electrical power. The explanation emphasizes the role of energy barriers and the necessity of maintaining a potential difference to drive current through a load.

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jaus tail
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Hi,
In seebeck effect:
Ref:
1572843145788.png

Once the red region is hot, the electrons and holes move toward cooler region i.e. bottom. So there is a positive potential toward right side of cold side and negative region toward left side of cold side. So why can't the electrons and holes combine here only instead of going all the way across the wire and meet with a resistance (load of bulb). Why can't they just recombine in the cold side?
 
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Sorry for question. I found a more appropriate diagram:
1572844375255.png

Ref:
 

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