Abstract
Current voltage (I-V) characteristic of illuminated photovoltaic (PV) cell varies with temperature changes. The effect is explained according to the physical theory of solids. The higher the temperature, the lower the open-circuit voltage and the higher the short-circuit current. This behaviour is explained on the basis of band theory of the solid-state physics. The increasing temperature causes a narrowing of the forbidden gap and a shift of the Fermi energy level towards the centre of the forbidden gap. Both these effects lead to a reduction of the potential barrier in the band diagram of the illuminated PN junction, and thus to a decrease of the photovoltaic voltage. In addition, narrowing of the forbidden gap causes higher generation of electron–hole pairs in the illuminated PN junction and short-circuit current increases. During the operation of PV panels, various damages occur due to external influences or degradation of the PV cells encapsulation. Damage first worsens the parameters of the PV panel, later leading to its destruction.
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Abbreviations
- I :
-
Electric current
- Isc:
-
Short-circuit current
- V :
-
Voltage
- V oc :
-
Open-circuit voltage
- V D :
-
Diffusion voltage
- V P :
-
Photovoltaic voltage
- E :
-
Electric field intensity
- P :
-
Power
- I r :
-
Irradiation intensity
- t :
-
Temperature (°C)
- T :
-
Temperature (K)
- E F :
-
Fermi energy level
- E i :
-
Center of the forbidden gap
- E V :
-
Valence band edge
- E C :
-
Conduction band edge
- ΔEG:
-
Energy forbidden gap
- E D :
-
Donor energy level
- E A :
-
Acceptor energy level
- N D :
-
Donor concentration
- N A :
-
Acceptor concentration
- λ :
-
Wavelength
- v :
-
Frequency
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Libra, M., Poulek, V. (2022). Influence of Temperature on Important Characteristics of Photovoltaic Cells. In: Al-Ahmed, A., Inamuddin, Al-Sulaiman, F.A., Khan, F. (eds) The Effects of Dust and Heat on Photovoltaic Modules: Impacts and Solutions. Green Energy and Technology. Springer, Cham. https://doi.org/10.1007/978-3-030-84635-0_13
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DOI: https://doi.org/10.1007/978-3-030-84635-0_13
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