Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.059
Publication date: 16th December 2024
Over the past decade, substantial strides have been made in enhancing the performance of tandem cells, culminating in dual junction configurations achieving PCEs nearing 34%, marked by various record-breaking updates.[1] In 2023, our research contributed significantly to this progress, unveiling three PCE records of 32.5%, 33.2%, and 33.7%.[2] These achievements were made possible by introducing solution-processed perovskites on micron-sized pyramidally textured c-Si bottom cells and a series of improvements at the interfaces and the bulk of the perovskite. As for the interfaces, we had to solve several issues, such as introducing a dielectric interlayer between perovskite and fullerene contacts to mitigate induced defect states [3], enhancing the recombination junction through ultrathin indium zinc oxide electrodes, introducing alternative hole selective contacts including polymers,[4] nickel oxide,[5] and self-assembled monolayers, and using alternative transparent electrodes. Each step of these advancements and their corresponding stability assessments revealed the pivotal role of interfaces. We also discovered that interfaces play a crucial role even during the encapsulation process, as thermomechanical stresses drive the degradation of solar cells, making interfacial strengths critically important. Furthermore, from a sustainability perspective, reducing the use of critical elements on the contacts is essential. To address this, we minimized the use of indium in the transparent electrodes of our tandem solar cells, thereby enhancing light coupling in the devices and making the process more sustainable [6]. Despite the remarkable achievements in perovskite-silicon tandem solar cells, their use in space remains a concern due to the radiation sensitivity of the silicon heterojunction bottom cells, while other extremes are still yet to be demonstrated. In this invited talk, I will present our systematic solutions to solve stability issues in dual junction tandem solar cells, along with insights into their potential for space applications.
Erkan Aydin acknowledges financial support from the European Research Council (ERC) under the European Union’s Horizon Europe Research and Innovation Program (INPERSPACE, Grant Agreement No. 101077006) and KAUST for the use of the Core Labs facilities and funding.
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