Effective Dual Cation Release in Quasi‐2D Perovskites for Ultrafast UV Light‐Powered Imaging

Advanced Materials, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 17, 2024

Ruddlesden-Popper quasi-2D perovskites represent robust candidates for optoelectronic applications, achieving a delicate balance between outstanding photoresponse and stability. However, mitigating the internal defects in polycrystalline films remains challenging, their performances still lag behind that of 3D counterparts. This work highlights profound impact defect passivation at buried interface grain boundaries through dual-cation-release strategy. Cations released from pre-deposited inorganic iodide buffer layer effectively repair deep-level by inducing low-dimensional phase reconstruction interacting with undercoordinated ions. The resulting perovskite feature large size (>2 µm) minimum surface roughness, along alleviated out-of-plane residual tensile strain, which is beneficial inhibiting initiation propagation cracks. fabricated photodetector demonstrates drastically improved self-powered capability, maximum responsivity up to 0.41 A W

Язык: Английский

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Simultaneous Ultraviolet Conversion and Defect Passivation Stabilize Efficient and Operational Durable Perovskite Solar Cells

Advanced Functional Materials, Год журнала: 2024, Номер 34(33)

Опубликована: Май 2, 2024

Abstract Despite the swift development in perovskite solar cells (PSCs), great concerns regarding environmental vulnerability propose a big challenge for their long‐term operational stability. Herein, novel functionalized ultraviolet (UV) conversion small molecule, Coumarin 153 (C153), is judiciously introduced into precursor to effectively enhance device efficiency and stability against UV radiation. It found that uncoordinated Pb 2+ A‐site vacancies of can be successfully fixed through Lewis acid–base coordination hydrogen bonding upon C153 treatment, resulting stabilized structure with remarkably reduced intrinsic defects. Concurrently, incremental visible light absorption derived from down‐conversion effect molecules together optimized energy level arrangement contribute substantially enhanced photocurrent device. As result, resultant delivers champion 24.73%, accompanied by greatly improved environments, retaining over 90% initial PCE ≈380, ≈1400, 1710 h aging under continuous radiation, heating stress, illumination, respectively. This work provides an effective feasible strategy toward high‐efficiency environment‐stable PSCs.

Язык: Английский

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Revealing Interaction of Fluorinated Propylamine Hydrochloride with Precursor and Defect States of Perovskite Films Toward Efficient Flexible Solar Cells

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Май 13, 2024

Abstract The trap state at the surfaces and grain boundaries of perovskite is one major obstacles to further commercialization flexible solar cells (FPSCs). Herein, two innovative multifunctional fluorinated propylamine salt 2,2,3,3,3‐pentafluoropropylamine hydrochloride (PFPACl) 3,3,3‐triflupropylamine (TFPACl) are in situ introduced onto photo absorbing layer improve performance FPSCs. nuclear magnetic resonance (NMR) spectroscopy indicates strong interactions both PFPACl TFPACl with precursor components. For first time, structures supramolecular complexes formed by additives FAI deduced from NOESY NMR data, thus pointing importance preorganization components solution before film casting. experiments density functional theory（DFT) calculations reveal that likely dissociated more into form R‐NH 3 + ‐Cl − due higher electronegativity fluoroalkyl tail. Therefore, PFPA binds strongly V FA defects than TFPA , anion Cl has enough interaction uncoordinated Pb 2+ leading homogeneous coverage on entire surface films better energy alignment hole transport layer. Consequently, PFPACl‐treated FPSCs achieved a relatively high PCE 23.59% excellent mechanical robustness operational stability.

Язык: Английский

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Surface Passivation with Tailoring Organic Potassium Salt for Efficient FAPbI₃ Perovskite Solar Cells and Modules

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Июнь 3, 2024

Abstract Passivating surface defects on perovskite films with tailored functional materials has emerged as one of the most effective strategies for achieving high‐performance solar cells (PSCs). Among existing material selections, potassium salts stand out their passivation surrounding grain boundaries. However, widely used are inorganic and only soluble in highly polar solvents, which limits practical application passivation. Herein, a novel organic salt (KCFSO), multiple groups good solubility low isopropanol, is reported to function post‐treatment agent perovskite. Combined experimental results theoretical calculations, formed intermolecular interactions between KCFSO revealed play vital role determining defect effect. Thus, KCFSO‐modified film shows more uniform potential distribution, dramatically decreased density, improved charge transfer, leading champion power conversion efficiency (PCE) 25.11%, stability derived PSCs. As demonstration scalability, centimeter‐sized PSCs 5 cm × mini‐modules also demonstrate impressive PCEs 24.17% 20.18%, respectively. These findings provide insights into passivator design principles achieve efficient stable photovoltaics.

Язык: Английский

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Tailored Multisite Rigid Conjugated Molecules to Anchor Perovskite for Comprehensive Management of Perovskite Crystallization and Defects

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 7, 2025

Abstract engineering has emerged as a promising approach to improve the stability and power conversion efficiency of perovskite solar cells (PSCs) by regulating crystallization or defects. Conventional methods typically focus on single functional group, leading deficiency in simultaneously addressing above mentioned two aspects. Here, an innovative using (methylsulfonyl)phenyl)prop‐2‐en‐1‐amine hydroiodide (MSPPAI) is presented concurrently effectively modulate defect passivation. The unique structure MSPPAI, combining rigid conjugated with multisite anchoring groups (─NH 2 ─SO ─), enables precise regulation through strong interaction components. This promotes preferred (100) orientation crystals, enhances grain size, thus improves film quality. Meanwhile, approximate coplanarity further facilitate ordered directional growth. Furthermore, preventing volatile loss coordinating residual Pb 2+ , MSPPAI could stabilize boundaries surfaces reduce defects prevent degradation. Utilizing these mechanisms, corresponding based devices achieves 25.54% exhibits excellent that maintains 93% its initial even after 1600 h under humid conditions. molecular design strategy presents novel for improving PSCs.

Язык: Английский

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Co‐Adsorbent Boosting the Performance of Perovskite Solar Cell Based on Hole‐Selective Self‐Assembled Molecules

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 3, 2025

Abstract The inverted perovskite solar cells based on hole‐selective self‐assembled molecules (SAMs) have been setting new efficiency benchmarks. However, the agglomeration of SAM and lack defect passivation ability are two critical issues that need to be addressed. It is demonstrated by blending co‐adsorbent 4‐phosphoricbutyl ammonium iodide (4PBAI) with 4‐(7H‐dibenzo[c,g]carbazole‐7‐yl) phosphonic acid (4PADCB), enhanced homogeneity, conductivity, better energy levels can realized for co‐SAM contact. functional group 4PBAI also effectively passivate defects at buried interface template high‐quality growth. Assisted synergistic top modification, power conversion optimized device reaches 24.96%, which retain 95% initial after 1200 h in ambient unencapsulated device. findings suggest a well‐designed address limitations further enhance performance cutting‐edge SAMs.

Язык: Английский

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Post‐Assembled Dipole Benzoic Acids Modified Me‐4PACz for Efficient and Stable Inverted Perovskite Solar Cells

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 16, 2025

Abstract Self‐assembled monolayers (SAMs), particularly those molecules composed of carbazole and phosphonic acid, are widely employed as effective hole‐selective layer (HSL) in inverted perovskite solar cells (PSCs). However, the insufficient chemical bond formation with metal oxides (ITO) self‐aggregation solvents acid SAM led to non‐uniform HSL, which turn affect power conversion efficiency (PCE) stability PSCs. Herein, a series benzoic materials (BAs), including p‐fluorobenzoic (FBA) p‐methylbenzoic (MBA), used post‐assembly effectively fill voids between [4‐(3,6‐dimethyl‐9H‐carbazole‐9‐yl)butyl]phosphonic (Me‐4PACz) form denser facilitates passivation buried interface. In addition, post‐assembled BAs different dipole moments can adjust work function Me‐4PACz facilitating transport extraction charge carriers. Consequently, PSCs based on Me‐4PACz/FBA HSL realize champion PCE 25.58%. Moreover, unencapsulated devices maintain 82% 94% after 800 h outdoor storage (RH≈60%) 2000 glove box, respectively. This technique enhances both device, blazing simple pathway for further development

Язык: Английский

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A Versatile Bridging Molecule Managed the Buried SnO₂/Perovskite Interface for Efficient and Stable Perovskite Solar Cells

Small, Год журнала: 2025, Номер unknown

Опубликована: Апрель 3, 2025

Buried interface in perovskite solar cells (PSCs) is a critical determination for the performance and stability because it dominates crystallization of layer, non-radiative recombination, ion migration at interfaces. Herein, novel versatile modifier, potassium sucrose octasulfate (K8SOS) which rich sulfonic groups ions, introduced bridging buried SnO2 interface, to improve interfacial states further device performance. It found that K8SOS serves as bridge can not only passivate defects through multi-site strengthening chemical binding, thus effectively inhibiting non-radiation recombination suppressing migration, but also optimize surface state absorber, ultimately achieving gratifying efficiency 25.32% with negligible hysteresis. What's more, optimized delivers admirable sustaining over 90% initial power conversion after being aged under continuous 85 °C heating stress 40 ± 5% RH humidity ≈600 ≈1200 h 1-sun illumination, respectively.

Язык: Английский

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Triisocyanate Derived Interlayer and High‐Melting‐Point Doping Promoter Boost Operational Stability of Perovskite Solar Cells

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(17)

Опубликована: Фев. 28, 2024

Abstract Formamidinium lead triiodide serves as the optimal light‐absorbing layer in single‐junction perovskite solar cells. However, achieving operational stability of high‐efficiency n‐i‐p type devices at elevated temperatures remains challenging. In this work, we implemented effective surface modifications on microcrystalline films. This involved nucleophilic addition formamidinium cations and coordination residual PbI 2 with triphenylmethane triisocyanate well subsequent polymerization. The situ growth a cross‐linking network chemically anchored film approach effectively reduced trap densities, favorably altered work function, suppressing interface charge recombination thus enhancing cell efficiency. Coupled high‐melting‐point air‐doping promoter, fabricated cells surpassing 25 % efficiency, demonstrating excellent 65 °C.

Язык: Английский

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Achieving High‐Quality Perovskite Films with Guanidine‐Based Additives for Efficient and Stable Methylammonium‐Free Perovskite Solar Cells

Advanced Functional Materials, Год журнала: 2024, Номер 34(46)

Опубликована: Авг. 17, 2024

Abstract Power conversion efficiencies (PCEs) of the methylammonium‐free (MA‐free) perovskite solar cells (PSCs) are constantly lagging behind those most extensively researched triple cation mixed PSCs due to their subpar films. Here, two guanidine‐based passivation agents proposed, that are, sulfaguanidine (S‐Gua) and 1‐acetylguanidine (A‐Gua) can be applied optimize film quality MA‐free for minimizing efficiency discrepancy between types PSCs. Through strong coordination with Pb 2+ hydrogen bonding formamidinium (FA + ), additives reduce bulk defects suppress non‐radiative recombination, which in turn enhance charge extraction transfer efficiency. Consequently, S‐Gua‐ A‐Gua‐treated devices achieve PCEs 24.34% 23.77%, respectively. Both greater than control device (23.03%), PCE is comparable best inverted narrower bandgaps. Moreover, S‐Gua‐treated maintain 89.3% 82.0% initial after aging 800 h heating (85 °C) 340 ambient air without any encapsulation, This work offers comprehensive insights into use high‐quality films subsequently state‐of‐the‐art

Язык: Английский

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