Effect of conversion efficiency of electroluminescence and solar cell with change of perovskite thickness

Abstract

Evidence suggests that the combination of a diode structure with a hybrid organic-inorganic perovskite may give rise to multifunctional device phenomena, such as the high power conversion efficiency of a solar cell and the strong electroluminescence efficiency of a light-emitting diode. This might open the door for the creation of a device with several uses. These multifunctional devices have a limited ability to approach the Shockley-Queisser efficiency limit due to the nonradiative losses that lower the open circuit voltage (Voc) . Here, we investigate and quantify the radiative limit of current carrying capacity in a perovskite solar cell as a function of absorber thickness. We seek to get a deeper understanding of the limiting elements that contribute to a low Voc by developing a link between PCE and EL efficiency over a variety of thicknesses. The efficiency of power conversion increases with increasing perovskite thickness, whereas the efficiency of energy conversion declines. To control light while also minimisingnonradiative losses, it is necessary to consider both of these figures of merit of a solar cell and tie them together. The findings suggest that increasing the efficiency of absorption and emission is critical for enhancing device performance.