Jiaxing Song

Perovskite solar cells (PSCs) face critical challenges in long‐term stability, lead toxicity, and mechanical fragility, aggravated under UV light and mechanical deformation. Here, we introduce an in situ crosslinked dynamic polymer network (PSS) as a multifunctional additive that simultaneously imparts room‐temperature self‑healing, crystallization regulation, defect passivation, and ion immobilization. The network enables the perovskite composite to achieve room‑temperature self‑healing in 10 min. Flexible PSCs incorporating PSS attain a champion power conversion efficiency (PCE) of 24.97%, retain over 84% of initial performance after 8000 bending cycles, and recover to over 96% within 10 min. In rigid devices, the network regulates crystallization and passivates defects, yielding a champion PCE of 26.30%. Moreover, the crosslinked framework acts as a physical barrier at grain boundaries, while its abundant functional groups bind mobile ions through chelation, collectively suppressing moisture/oxygen ingress and ion migration. This synergistic effect enables over 96% efficiency retention after 1500 h of maximum power point tracking, reduces lead leakage by over 90% in water, and significantly enhances UV tolerance. This in situ crosslinked network with low T _g and diphenyl disulfide bonds provides a promising platform for rapid self‐healing additives toward high‐efficiency, mechanically robust, and environmentally sustainable perovskite photovoltaics.

A triammonium-cation-derived 0D perovskite facilitates the formation of highly (100)-oriented perovskite films with enlarged grains and reduced defect density, yielding a superior 24.11% perovskite solar module with outstanding stability.

Efficient and stable inverted perovskite solar cells were developed by introducing crown ether (DB18O) to regulate the properties of perovskite films.

Ruddlesden–Popper (RP) 2D perovskites with organic bilayers attract great interest for optoelectronics owing to their high stability and tunable functionality. However, the relationship between the interlayer architecture, molecular configuration of aromatic cations, and resulting stability remains poorly understood. Herein, we systematically investigate phenyl alkylammonium‐based RP 2D perovskites with varying alkyl chain lengths (─(CH ₂ ) _m NH ₃ ⁺ with m = 1–4) of organic cations. We find that odd‐carbon cations (m = 1, 3) preferentially form type‐I 2D perovskites featuring interdigitated organic cations, which induces substantial inorganic distortion and lower octahedral symmetry to the C ₁ point group. Even‐carbon cations (m = 2, 4) favor type‐II 2D perovskites with well‐defined interlayer gaps, wherein the alkylammonium groups rotate to optimize registry with the inorganic sublattice, minimizing distortion and yielding higher‐symmetry D _{2 h} octahedra. Furthermore, we demonstrate that intrinsic structural stability of RP 2D perovskites is primarily governed by π–π packing within the organic layer, whereas air stability of the thin films is determined by surface hydrophobicity. The type‐II films exhibit higher hydrophobicity, conferring enhanced stability under ambient conditions compared to type‐I films. These findings establish odd‐even alkyl chain parity as a design principle for tailoring structurally diverse yet stable RP 2D perovskites.

Ruddlesden–Popper (RP) 2D perovskites with organic bilayers attract great interest for optoelectronics owing to their high stability and tunable functionality. However, the relationship between the interlayer architecture, molecular configuration of aromatic cations, and resulting stability remains poorly understood. Herein, we systematically investigate phenyl alkylammonium‐based RP 2D perovskites with varying alkyl chain lengths (─(CH ₂ ) _m NH ₃ ⁺ with m = 1–4) of organic cations. We find that odd‐carbon cations (m = 1, 3) preferentially form type‐I 2D perovskites featuring interdigitated organic cations, which induces substantial inorganic distortion and lower octahedral symmetry to the C ₁ point group. Even‐carbon cations (m = 2, 4) favor type‐II 2D perovskites with well‐defined interlayer gaps, wherein the alkylammonium groups rotate to optimize registry with the inorganic sublattice, minimizing distortion and yielding higher‐symmetry D _{2 h} octahedra. Furthermore, we demonstrate that intrinsic structural stability of RP 2D perovskites is primarily governed by π–π packing within the organic layer, whereas air stability of the thin films is determined by surface hydrophobicity. The type‐II films exhibit higher hydrophobicity, conferring enhanced stability under ambient conditions compared to type‐I films. These findings establish odd‐even alkyl chain parity as a design principle for tailoring structurally diverse yet stable RP 2D perovskites.

Efficient wide‐bandgap (WBG) perovskite top cells are essential for high‐performance perovskite/silicon tandem solar cells (TSCs), yet their fabrication in humid ambient air remains difficult because moisture‐ and oxygen‐induced reactions deteriorate film quality and stability. Here, 4‐[[4,6‐bis(octylthio)‐1,3,5‐triazin‐2‐yl]amino]‐2,6‐bis(1,1‐dimethylethyl)‐phenol (BTDP) is introduced into the perovskite precursor to enable WBG perovskite formation under high‐humid ambient air conditions. BTDP scavenges superoxide radical anions, inhibits I ⁻ oxidation to I ₂ , absorbs ultraviolet light, coordinates with Pb ²⁺ to regulate crystallization and forms a hydrophobic barrier at surfaces and grain boundaries. With this strategy, blade‐coated WBG perovskite solar cells (PSCs) fabricated at 60% relative humidity deliver a power conversion efficiency (PCE) of 23.45%, which represents the highest PCE reported for air‐processed WBG PSCs with bandgap ≥1.68 eV. Mini‐modules with an aperture area of 14.81 cm ² reach 20.12% efficiency. Moreover, the method enables ambient‐air fabrication of two‐terminal perovskite/tunnel oxide passivated contact (TOPCon) TSCs with a certified efficiency of 32.59%, among the highest PCEs reported for two‐terminal perovskite/TOPCon TSCs. This study provides a scalable route to efficient, stable single‐junction and tandem perovskite photovoltaics.

Flexible perovskite solar cells and modules are limited by buried-interface nonuniformity and the thickness-sensitive, aggregation-prone nature of conventional small-molecule self-assembled monolayers, which create local recombination hot spots and crack-initiated degradation during large-area coating and bending. Here we introduce asymmetric polymeric self-assembled layers based on poly(4-(3-phenyl-9H-carbazol-9-yl)butyl phosphate) (Poly-3Ph-4PACz), a polycarbazole phosphonic acid featuring rigid phenyl-carbazole units and multiple anchoring sites. The polymeric architecture yields a dense, highly wetting and electrically homogeneous hole-selective contact with enhanced interfacial dipole and strong perovskite binding, enabling uniform crystallization, reduced non-radiative losses and effective stress buffering. Flexible devices reach 26.13% champion power conversion efficiency, while 57.6 cm² flexible modules deliver 22.22%. Encapsulated modules retain 97.23% after 3000 bending cycles and show damp-heat resilience with T₉₅ > 1000 h at 85 °C/85% RH. Beyond flexibility, Poly-3Ph-4PACz enables 27.18% rigid inverted perovskite solar cells (certified mean steady-state 27.12%) and a certified 32.95% perovskite/Si tandem efficiency. These results establish polymeric self-assembly as a scalable route to high-efficiency, durable flexible photovoltaics.

Efficient SnO ₂ -based perovskite solar cells were developed by introducing threonine for regulating the properties of the bottom interface.

Poly(3,4‐ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS, AI 4083), is by far the most widely employed hole transport layer (HTL) material, but still suffers from drawbacks of high acidity and strong hydrophilicity, which hamper the device stability in organic solar cells (OSCs). To address these limitations, we designed and synthesized a novel CF ₃ ‐containing sulfonated copolymer (PSF) counterion and incorporated it with PEDOT to form the PEDOT:PSF complex, which has excellent solution and film stability. In this work, PSF combines a significant reduction of the acidity with a much decreased hygroscopic nature. When employed in OSCs with different active layers, namely PM6:Y6, PM6:BTP‐eC9, PM6:L8‐BO, and D18:L8‐BO, the PEDOT:PSF‐doped HTL delivered maximum power conversion efficiencies (PCEs) of 16.71%, 17.20%, 18.36%, and 18.55%, respectively, which are consistently slightly better than those achieved by comparable OSCs using PEDOT:PSS as HTL. Notably, this novel HTL displayed significantly enhanced stability and durability of devices; the doped and pristine PEDOT:PSF‐based OSCs retained 83% and 71% of their initial PCE after 730 h of continuous illumination, whereas PEDOT:PSS devices retained merely 58%.

Effectively suppressing defects at the SnO2/perovskite (PVK) interface is critical for high-performance perovskite solar cells (PSCs). Here, we introduce glutamic acid (Glu) into SnO2, achieving synergistic regulation of the SnO2/PVK interface properties. The introduction of Glu not only significantly suppresses SnO2 agglomeration but also, due to the presence of the dual carbonyl group in the molecule, effectively coordinates with Sn4+ and Pb2+, passivating the defects on both SnO2 and PVK layers. Correspondingly, the density functional theory calculation results indicate that when the amino group in Glu coordinates with Sn4+, the coordination interaction between the terminal carbonyl group (C1=O) and Sn4+ is further enhanced. Therefore, the SnO2–Glu-based PSC achieves a champion power conversion efficiency of 24.35% (0.06 cm2) and 18.50% in the mini-module (15 cm2). The unencapsulated device maintains >92% of its initial efficiency after continuous operation for 1000 h under air. This study reveals the mechanism by which Glu synergistically regulates the multi-interface property, thus providing an effective approach for achieving efficient SnO2-based PSCs.