What is the advantage of using amorphous silicon as the material for solar cell when compared with polycrystalline silicon?

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BlackTom AI · Accepted Answer

Question restatement: What is the advantage of using amorphous silicon as the material for a solar cell when compared with polycrystalline silicon?

Option 1: It can be formed at lower temperature
This is the commonly cited practical advantage. Amorphous silicon (a-Si) can be deposited at significantly lower temperatures than crystalline forms, allowing fabrication on inexpensive substrates like glass or plastic and enabling large-area, lightweight, flexible panels. This lowers manufacturing costs and enables new form factors.

Option 2: It is more efficient in converting light energy to electrical energy
This is not correct. Amorphous silicon generally has lower efficiency than polycrystalline silicon due to poorer crystal quality, more defect states, and broader recombination losses. While it can absorb light well, the conversion efficiency is typically lower than that of polycrystalline silicon under similar conditions.

Option 3: It is more stable
In fact, amorphous silicon is less stable over time. It experiences light-induced degradation (LID) where its efficiency decreases with illumination, and it also has issues with aging. Polycrystalline silicon tends to be more stable in long-term operation, so this is not an advantage of a-Si.

Option 4: It has lower internal resistance
Internal resistance is more a function of device design and quality of contacts; the material form (amorphous vs polycrystalline) does not inherently guarantee lower internal resistance. In many cases, a-Si devices can have similar or higher series resistance due to thinner active layers or different junction properties, so this is not a definitive advantage.

Summary of reasoning: The primary practical advantage of amorphous silicon over polycrystalline silicon lies in processing temperature and substrate flexibility. The lower deposition temperatures enable cheap, large-area production on diverse substrates, which is the key driver for choosing a-Si in certain applications. The other statements describe disadvantages or non-unique attributes, making them incorrect as general advantages.

EESM5200 (L1) Part I: Topic 9 - Optical Properties of PN Junction

What is the advantage of using amorphous silicon as the material for solar cell when compared with polycrystalline silicon?

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