The effect of temperature rise on the thermal conductivity of composite (perovskite/polymer) solar cell

The efficiency of solar cell and the corresponding output power is mainly affected by the rise in the film temperature, and in such cases, the stability in thermal conductivity value is required to ensure adequate rate of heat loss.This study investigates the effect of temperature rise on the overall thermal conductivity of the perovskite cell including the response of polymeric additives that have been used recently to enhance the interaction between different grains in perovskite films.The polymers under study are: polyethylene oxide (PEO), polyacetylene (PA), polythiophene (PT), polystyrene (PS) and polymethyl methacrylate (PMMA).The work assumes mathematical procedure that links the variation of temperature to the degree of polymer's crystallinity and then converting this impact in terms of thermal conductivity.The calculations assumed three different concentrations of the polymer as: 1, 3 and 5%.Each polymer has served with two degrees of crystallinity.In general, the results show that the effect of added polymers on the final value of the thermal conductivity of the film may be positive or negative depending on three main factors: k-value of the perovskite-based material, k-value of the polymer and concentration of the polymer.The effect of the polymer appears more when it is used with the low k-value perovskite material (0.2 W/mK) rather than with high k-value perovskite material (0.8 W/mK).The addition of PEO to the perovskite-based materials makes the overall k-value of the film reaches to 3.7 W/mK and even higher when the temperature rises up.Hence, this polymer is useful in high operation temperature.In the case of using polymers (PA and PT), the overall k-value of the film was less sensitive.The use of amorphous polymers (PS and PMMA) has not witnessed any significant contribution in the overall k-value of the film.