Speakers

Perovskite solar cells (PSCs) have gained significant prominence due to their high power conversion efficiency (PCE) and low-cost fabrication. However, conventional sandwich-type architectures suffer from parasitic optical losses as incident light must traverse the substrate, transparent conductive oxides (TCO), and charge transport layers. Back-contact perovskite solar cells (BC-PSCs) mitigate these losses by positioning all electrodes beneath the absorber, allowing for direct illumination. Despite this structural advantage, the PCE of BC-PSCs remains limited because typical electrode linewidths and spacings—often in the micrometer (μm) range—far exceed the carrier diffusion lengths of perovskites, leading to severe recombination​. In this work, we employ nanoimprint lithography (NIL) combined with plasma etching to fabricate submicron-scale honeycomb quasi-porous electrodes (HQPEs) for BC-PSCs. This top-down patterning strategy yields highly uniform and reproducible BC-electrodes while effectively mitigating lift-off failures and preserving structural integrity. Furthermore, by optimizing the perovskite deposition process onto these BC-electrodes, a flat, compact, and pinhole-free active layer was successfully achieved, ensuring high-quality interfacial contact​.​​​​