Organic-inorganic metal halide perovskites have seen a resurgence in interest due to unprecedented gains in power conversion efficiency (PCE). Perovskite solar cells, however, suffer from several stability challenges including thermomechanical reliability and moisture sensitivity, which are not competitive with the stability of c-Si modules that exhibit 25-service lifetimes.
We first review results from extensive studies involving an international collaboration on the inherent thermomechanical challenges for reliability of a wide range of planar and mesoporous perovskite solar cells including the role of perovskite and charge transport layer compositions. Trade-offs between efficiency and reliability, meaning maximal conversion efficiencies often come at the expense of mechanical reliability and long-term stability, are discussed.
We next consider accelerated scaling strategies to rapid open-air fabrication of durable perovskite solar modules with improved inherent perovskite and charge transport layer performance and thermal stability. We consider strategies to improve charge transport layers with a concomitant increase in device efficiency. Importantly, we demonstrate that mechanically robust perovskite films can be cured with an open-air atmospheric plasma discharge on large-scale substrates, and at linear deposition rates exceeding 4 cm/s with improved power conversion efficiency and open-circuit voltages.
Finally, we conclude by reporting on a new concept in solar cell design, the scaffold-reinforced compound solar cell (CSC) with integrated low cost optics which addresses the intrinsic fragility of these materials with mechanically reinforcing internal scaffolds. These developments mitigate the foremost barriers to wide-scale commercial deployment, namely perovskite module manufacturing and reliability, providing momentum towards the goal of 0.02 $/kWhr that exceeds even the most aggressive predictions for new silicon PV production and a pathway to tandems.
AP 483 Optics and Electronics Seminar
Prof. Olav Solgaard, Organizer Fall 2019
AMO Seminar Sub-Series first Monday of each month)
Monica Schleier-Smith, Organizer Fall 2019