D7.4 Update to D7.1, taking into account new device stacks, refined materials properties and optimized modelling

D7.4 Update to D7.1, taking into account new device stacks, refined materials properties and optimized modelling

Report D7.4 is an update of the confidential report D7.1 which outlined simulation guidelines for improving the optical and electrical performance of perovskite and perovskite-silicon tandem solar cells within the VIPERLAB consortium. It describes three rounds of comparative simulations that examined various tools to identify their strengths, limitations, and differences. The findings of D7.1 emphasized the importance of critical parameters such as material properties, layer thicknesses, and doping levels in achieving optimal device efficiency.
In D7.4 our enhanced opto-electrical simulations, now incorporating mobile ion effects, reveal key performance influencers in perovskite/silicon tandem solar cells. In addition, we quantified the impact of C60 interface recombination (-7.6% efficiency loss per decade of increase), C60 thickness (-0.05% efficiency loss per nm increase), and perovskite ion concentration (-1.6% efficiency loss per decade of increase). Furthermore, simulations predict a ~4% absolute efficiency gain/loss under standard test conditions when incorporating/avoiding a tailored refractive index matching layer (n≈2.9), compared to a non-ideal refractive index jump between the recombination layer (ITO) and the a-Si layers below. To broaden applicability, future model development will address non-STC scenarios, including varying illumination angles, temperatures, and spectral distributions. Temperature dependencies present a significant challenge due to their complex effects on material properties, requiring advanced optimization strategies and rigorous experimental validation, which presents a change to establish community-wide simulation standards.