Can everyone please give me the reference which is related?
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The relation between Bandgap and the Temperature can be described by expression given by Varshni. From that, you will find as the temperature increases, bandgap of the material decreases.
Now, the decrease in bandgap of the material, allows the additional absorption of the photons of small energy, therefore increasing the short-circuit current. But, the decrease in the bandgap leads to a decrease in the open-circuit voltage.
So, the dominating combined effect of the increased short-circuit current and decreased open-circuit voltage will determine the rise or fall of the conversion efficiency of the solar cell.
For the perovskite film, the increased heat treatment temperature can bring the redshift of the absorption edge leading to the decrease of bandgap from 1.569 to 1.508 eV and an increase of defect density from 3.87 × 10^17 cm^−3 to 9.03 × 10^17 cm^−3.
close band gap and low temperature are effective on efficiency improvement.
Close band gap and low temperature are effective on efficiency improvement.
Vinh Pham As Band Gap tuning is one of the advantages of using perovskite materials in solar cell, changing band gap of perovskite materials can be done for varying the range of light absorbed by the materials. For greater power conversion efficiency it is much necessary that light absorbed must in right optical range so changing band gap can help us to increase efficiency of our device. By changing halogen band gap of perovskite material can be changed as bandgap is inversely proportional to atomic number.
Effect of temperature- Suppose a material is under cubic phase( say around 5933 K and possess perovskite property and transforms to orthorhombic phase ( at room temperature ) which is non perovskite , so by changing temperature it may be possible that material may loose its perovskite nature and which will affect the efficiency of our device.
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