Balancing formation of Perovskite solar cell components

  • Context: Chemistry 
  • Thread starter Thread starter Mayhem
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Discussion Overview

The discussion revolves around the balancing of components in Perovskite solar cells, specifically focusing on the notation involving the variable x, which represents the ratio of bromide and iodide in the final product. The conversation touches on conceptual understanding and the implications of using x in this context.

Discussion Character

  • Conceptual clarification, Technical explanation

Main Points Raised

  • One participant expresses confusion regarding the 1-x notation, questioning how bromide and iodide can coexist in the final product without resulting in negative amounts of iodide.
  • Another participant clarifies that x is a real number within the range of <0..1>, suggesting that the right side of the equation represents a bulk mixture rather than a single molecule.
  • A later reply acknowledges the clarification and proposes that the components can be balanced using x and 1-x as coefficients.
  • There are mentions of "NH3" being interesting, with a subsequent participant identifying it as a methyl ammonium halide.

Areas of Agreement / Disagreement

Participants appear to have differing levels of understanding regarding the notation and its implications, with some clarifications provided but no consensus reached on the initial confusion about the balancing of components.

Contextual Notes

The discussion does not resolve the conceptual issues raised about the notation and its application in balancing the components of Perovskite solar cells.

Mayhem
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Homework Statement
Balance ##\mathrm{\ CH_3NH_3PbBr_3+ CH_3NH_3PbI_3 \rightarrow CH_3NH_3Pb(I_{1-x}Br_x)_3}##
Relevant Equations
None
I don't understand the 1-x notation, as for all x, there wouldnt be an x such that bromide and iodide exists in the final product. i.e. for x = 0, the number of bromide would be 1, for x = 1, bromide would be one, for x > 1, we would achieve a negative amount of iodide, and thus this makes no conceptual sense.

How do I go about balancing this?
 
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x is not an integer, it is a real number from the <0..1> range.

What you have on the right is not a single molecule, more like a bulk mixture.
 
Borek said:
x is not an integer, it is a real number from the <0..1> range.

What you have on the right is not a single molecule, more like a bulk mixture.
Ah, makes sense then. I take it that it can be balanced by x and 1-x as coefficients then.
 
The "NH3" is interesting.
 
DrDu said:
The "NH3" is interesting.
It's a methyl ammonium halide.
 

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