Abstract
Photovoltaic cells and modules are exposed to partially rapid changing environmental parameters that influence the device temperature. The evolution of the device temperature of a perovskite module of 225 cm2 area is presented during a period of 25 days under central European conditions. The temperature of the glass–glass packaged perovskite solar module is directly measured at the back contact by a thermocouple. The device is exposed to ambient temperatures from 3 to 34 °C up to solar irradiation levels exceeding 1300 W m−2. The highest recorded module temperature is 61 °C under constant high irradiation levels. Under strong fluctuations of the global solar irradiance, temperature gradients of more than 3 K min−1 with total changes of more than 20 K are measured. Based on the experimental data, a dynamic iterative model is developed for the module temperature evolution in dependence on ambient temperature and solar irradiation. Furthermore, specific thermal device properties that enable an extrapolation of the module response beyond the measured parameter space can be determined. With this set of parameters, it can be predicted that the temperature of the perovskite layer in thin‐film photovoltaic devices is exceeding 70 °C under realistic outdoor conditions. Additionally, perovskite module temperatures can be calculated in final applications.
Highlights
With record efficiencies of perovskite solar cells surpassing 23% of this thin-film technology is approaching the efficiencies of the best devices of the established photovoltaic (PV) industries that use Si, copper indium gallium selenide (CIGS), or CdTe as photoactive materials.[1]
The perovskite module temperature is measured on a 225 cm2 sample device that is mounted on a 2400 cm2 unpolished metal plate of stainless steel (Figure 1a)
A large area of the light-absorbing area is consisting of highly reflective steel resulting in an overall low α, whereas the emissivity of steel and glass is in the range of 0.9–1.[15]. In the case of a perovskite module covering the full area, the absorption coefficient of the device can increase to 0.8
Summary
With record efficiencies of perovskite solar cells surpassing 23% of this thin-film technology is approaching the efficiencies of the best devices of the established photovoltaic (PV) industries that use Si, copper indium gallium selenide (CIGS), or CdTe as photoactive materials.[1].
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