Triple-junction all-perovskite solar cells with self-assembling hole contacts in all subcells
Paper
Joule
A Joule paper reported a 27.3% all-perovskite triple-junction cell using a graphene oxide/self-assembled monolayer hole-contact strategy. The key point is not only efficiency: the device retained 90% of initial efficiency after 770 hours, which makes this a meaningful stability result for an all-perovskite architecture. Still, this is a lab cell, not a module or field-proven product. (Paper abstract confirms 22.1% single-junction Sn–Pb at 0.88 V and 27.3% triple-junction, stabilized at 27.0%.)
Perovskite–organic tandem solar cells with a photo-transformable stabilizer
Paper
2026-07-13
Nature
Li Yongfang and Meng Lei’s group (Institute of Chemistry, Chinese Academy of Sciences) add a photo-transformable additive, TDB (4-[3-(trifluoromethyl)-3H-diazirin-3-yl]benzylamine), to the wide-bandgap perovskite: it improves halide homogeneity during crystallization, then transforms under illumination into a species that binds grain boundaries to suppress iodide defects, carrier trapping and ion migration. Press coverage of the paper (pv magazine, Xinhua, Perovskite-Info) reports a certified steady-state 28.04% power conversion efficiency — a claimed world record for perovskite–organic tandems, 28.80% in-lab — a 1.88 eV single-junction cell at 20.01%, and 90% efficiency retention after 625 hours of continuous illumination. The verbatim Nature abstract is paywalled, so the mechanism and performance figures here are drawn from that press coverage rather than from the primary abstract.
Spatiotemporally homogeneous crystallization for ambient scalable perovskite photovoltaics
Paper
2026-07-16
Science
A phase-locking strategy keeps α-phase FAPbI3 crystallizing uniformly in space and time during ambient, large-area blade coating, using a dynamically evolving moisture-buffering intergranular network to stop humidity-driven premature degradation and directional non-uniformity. Blade-coated cells reached 26.7% power conversion efficiency (26.1% certified), and rigid and flexible 100 cm² modules hit 21.5% and 19.5% respectively. Encapsulated devices retained more than 90% of initial efficiency after 1,500 hours of 85 °C maximum-power-point tracking in ambient air — a direct answer to the scalable, ambient-manufacturing problem.
Indium-free perovskite/silicon tandem solar cells with tin oxide recombination layer and electrodes
Paper
2026-07-09
Science
Reactive-plasma-deposited tin oxide (RPD-SnOx) replaces indium-based transparent conductive oxides — whose scalability is limited by indium scarcity and sputter damage — as both the recombination layer and the electrodes of a perovskite/silicon tandem. Using RPD-SnOx as the recombination layer alone gave a certified 33.6%; a fully indium-free device reached a 33.2% champion efficiency (1 cm²) and a certified 31.0% minimodule (207.9 cm²). The indium-free minimodules retained 65% of peak efficiency after 105 days outdoors — tying the circularity/supply-chain theme directly to a headline tandem result.
Dynamic anionic sublattice engineering in perovskite heterostructures for perovskite–silicon tandem solar cells
Paper
2026-07-09
Nature Synthesis
Dynamic orientational disorder of cyanate (OCN) pseudo-halide anions is used to regulate perovskite nucleation kinetics, suppress defect states and raise carrier mobility in wide-bandgap perovskite heterostructures — an “anionic sublattice engineering” route the authors say breaks the efficiency–stability trade-off. Nature’s article summary reports a certified 34.29% monolithic perovskite–silicon tandem with exceptional operational stability. The full abstract is paywalled; the efficiency figure is attributed to that publisher summary, and no specific stability hours or retention were disclosed there.
Enhancing Sn-Pb perovskite homogeneity via thioether coordination for efficient and stable all-perovskite tandem solar cells
Paper
2026-07-10
Science Advances
S-allyl-L-cysteine (SALC), a thioether ligand, preferentially coordinates with SnI2 in the narrow-bandgap tin–lead subcell, giving spatially uniform Sn/Pb distribution and a 3.5-fold reduction in trap-forming Sn(IV). The single-junction Sn-Pb cell reached a champion 22.99% efficiency at 0.892 V open-circuit voltage, and the all-perovskite tandem hit a certified 28.84% (29.44% in-lab), retaining nearly 90% of initial efficiency after 420 hours of maximum-power-point tracking under one sun in ambient air.
Stabilizing 1.93-eV ultrawide-bandgap perovskites for efficient triple-junction solar cells
Paper
2026-07-10
Nature Communications
To fix the phase instability of ultrawide-bandgap perovskites, 1,4-phenylenediamine dihydriodide is added to the 1.93 eV absorber (raising the ion-migration barrier and suppressing phase segregation), with a 3-(methylthio)propylamine hydroiodide surface post-treatment. The monolithic perovskite/perovskite/silicon triple-junction reached a certified 26.18% efficiency at a 3.148 V open-circuit voltage (1.17 cm² aperture), and encapsulated cells kept 96% of initial performance after 1,500 hours of continuous maximum-power-point tracking — among the most stable triple-junction results reported to date.
Low-temperature liquid-assisted vibrational stress-relief strategy enables stable and efficient perovskite solar cells
Paper
2026-07-15
Nature Communications
A low-temperature liquid-assisted vibrational stress-relief (LTL-VSR) method uses high-frequency acoustic vibration — cavitation collapse and resonant lattice sliding — to strip nanoscale impurities, annihilate ionic vacancies and cut residual film stress more than tenfold without heat, a composition- and architecture-agnostic “mechanical healing” route. It delivered 26.47% (rigid) and 24.64% (flexible) cells and scaled to modules of 23.59% (16.8 cm²) and 20.55% (600 cm²), with unencapsulated devices retaining 92.4% of initial efficiency after 1,200 hours of operation.
2026 research cluster: perovskite–silicon tandem recycling and circularity
Paper
Solar Energy Mat. & Solar Cells · Adv. Materials
Beyond single-cell records, a cluster of 2026 papers is treating perovskite–silicon tandem PV as an industrial material system rather than only an efficiency platform. Recent work spans economically viable, environmentally beneficial recycling pathways for tandem modules (Duan et al., Solar Energy Materials and Solar Cells) and integrated lead/iodine management for sustainable perovskite modules (Xiao et al., Advanced Materials), alongside module waste-classification studies. The throughline matches this week’s trade news: as tandems approach commercialization, recycling routes, lead containment and iodine recovery are turning into up-front design constraints. (Curator note condensed; the source link is the Duan recycling paper.)
LONGi: 35.5% certified perovskite-silicon tandem cell
Market
2026-07-15
pv magazine
LONGi announced an ESTI-certified 35.5% efficiency for a two-terminal crystalline silicon-perovskite tandem cell. Fachlich relevant: it confirms that the tandem roadmap is still pushing well beyond single-junction silicon limits. But LONGi did not disclose active area or detailed electrical data, and the company has not announced a commercialization timeline for this exact device.
Qcells: UL/IEC certification milestone for perovskite tandem tech
Market
2026-07-17
PV Tech
Qcells says its silicon-perovskite tandem technology has met IEC and UL 61215 requirements via TÜV Rheinland, using cells/modules from its Bitterfeld-Wolfen pilot line. This is important because perovskite tandems need not just efficiency, but reliability, testability and bankability. It is not yet proof of broad field durability, but it is a commercialization-relevant step.
LONGi: silver-reduction and metallization push via ACM technology
Market
2026-07-16
PV Tech
LONGi also highlighted its nano-alloy matrix contact technology, now described as entering gigawatt-scale mass production. The relevance is practical: silver paste is becoming a cost and supply-chain bottleneck, so metallization innovation could matter as much as headline cell efficiency. Claims on reliability and cost impact should be watched for independent validation.
The summer solar surge is here for many. The challenge now is not scale, but flexibility
Press
2026-07-17
PV Tech
As solar penetration grows, grid flexibility is rising in importance; the deployment challenge is no longer only capacity but how flexibly that solar can be integrated — dispatch, storage and demand-shaping rather than raw installed gigawatts.