Publication date: 22nd July 2026
Halide perovskite solar cells (PSCs) have revolutionized the photovoltaic landscape, with conventional single-junction cells (typically employing regular-bandgap absorbers of ~1.55 eV) achieving certified power conversion efficiencies (PCEs) exceeding 28%, directly rivalling crystalline silicon. Concurrently, monolithic two-terminal (2T) all-perovskite tandem solar cells, which combine a wide-bandgap (WBG, 1.77~1.78 eV) top subcell with a narrow-bandgap (1.22~1.25 eV) Sn-Pb bottom subcell, represent one of the most compelling routes to surpass the Shockley-Queisser limit of single junctions. State-of-the-art all-perovskite tandems have reached certified efficiencies of 30.1%, while triple-junction architectures have surpassed 28%, demonstrating the vast potential of perovskite photovoltaics. Despite these milestone efficiencies, both single-junction PSCs and WBG tandem subcells are still hindered by critical material-level and interfacial bottlenecks that limit their theoretical efficiency limits and long-term operational lifespan: (i). 1.55 eV Single-Junction PSCs: These devices are primarily constrained by non-radiative recombination at deep-level bulk defects (e.g., undercoordinated Pb2+, halide vacancies) and severe carrier loss at the perovskite/charge transport layer (CTL) interfaces (PVK/SAMs or PVK/C60). Furthermore, the structural instability of the highly efficient α-FAPbI3 phase under moisture or thermal stress remains a key barrier to commercial-grade long-term stability. (ii). WBG Tandem Subcells: Mixed-halide compositions (FAxCs1-xPbIyBr1-y) are preferred for top subcells but suffer from two unique interrelated challenges: photo-induced phase segregation: Under solar illumination, spontaneous halide demixing creates iodide-rich, low-bandgap domains that trap charge carriers, driven by low halide interstitial migration barriers. Severe open-circuit voltage losses: WBG cells exhibit huge Voc deficits (>200 mV loss for 1.77 eV), primarily due to non-radiative recombination at the critical perovskite/C60 interface.
In this work, we will present our most recent results on the fabrication and testing of WBG and PSC sub cells, their performance and strategies towards additive engineering to enhance stability.
To the MICIU/AEI/10.13039/501100011033 for the project NextPVNet ref RED2024-154A8-T. To the Agencia de Gestió d’Ajuts Uni-versitaris i de Recerca (AGAUR) for the support to the consolidatedCatalonia research group 2021 SGR 01617 and the Xarxa d’R+D+I En-ergy for Society (XRE4S).
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