Bifunctional hole-shuttle molecule for improved interfacial energy level alignment and defect passivation in perovskite solar cells

Nature Energy, Journal Year: 2023, Volume and Issue: 8(5), P. 515 - 525

Published: April 17, 2023

Abstract Perovskite solar cells have reached a power conversion efficiency over 25%, and the engineering of interface between perovskite hole transport layer (HTL) has been crucial to achieve high performance. Here we design bifunctional molecule CBz-PAI with carbazole-triphenylamine phenylammonium iodide units passivate defects at perovskite/HTL interface. Owing favourable energy level alignment perovskite, acts as shuttle HTL. This minimizes difference quasi-Fermi splitting or ‘internal’ V oc , external device thus reducing voltage losses. As result, incorporating reach stabilized 24.7% maintain 92.3% initial after 1,000 h under damp heat test (85 °C 85% relative humidity) 94.6% 1,100 maximum point-tracking conditions.

Language: Английский

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25.24%‐Efficiency FACsPbI₃ Perovskite Solar Cells Enabled by Intermolecular Esterification Reaction of DL‐Carnitine Hydrochloride

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(16)

Published: Feb. 2, 2023

Judicious tailoring of the interface between SnO2 electron-transport layer and perovskite buried surface plays a pivotal role in obtaining highly efficient stable solar cells (PSCs). Herein, DL-carnitine hydrochloride (DL) is incorporated into perovskite/SnO2 to suppress defect-states density. A DL-dimer obtained at by an intermolecular esterification reaction. For film, Cl- can passivate oxygen vacancies (VO ) through electrostatic coupling, while N coordinate with Sn4+ Sn-related defects. FA+ defects via hydrogen bonding Pb-related more efficiently than DL monomer. Upon modification, interfacial are effectively passivated quality resultant film improved. As result, DL-treated device achieves gratifying open-circuit voltage (VOC 1.20 V champion power conversion efficiency (PCE) 25.24%, which record value among all reported FACsPbI3 PSCs date. In addition, unencapsulated devices exhibit charming stability, sustaining 99.20% 90.00% their initial PCEs after aging air for 1200 h continuously operating maximum point tracking 500 h, respectively.

Language: Английский

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Crystallization manipulation and holistic defect passivation toward stable and efficient inverted perovskite solar cells

Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 16(9), P. 3825 - 3836

Published: Jan. 1, 2023

Synergistic modification of new intermediate phase assisted crystallization and upper interface passivation for enhanced crystallization, reduced defect density, released stress in perovskite films, enabling 24.61% efficient inverted devices.

Language: Английский

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Multifunctional Small Molecule as Buried Interface Passivator for Efficient Planar Perovskite Solar Cells

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(22)

Published: March 2, 2023

Abstract The improvement of power conversion efficiency (PCE) and stability the perovskite solar cell (PSC) is hindered by carrier recombination originating from defects at buried interface PSC. It crucial to suppress nonradiative facilitate transfer in PSC via engineering. Herein, P‐biguanylbenzoic acid hydrochloride (PBGH) developed modify tin oxide (SnO 2 )/perovskite interface. effects PBGH on transportation, growth, defect passivation, performance are systematically investigated. On one hand, can effectively passivate trap states Sn dangling bonds O vacancies SnO surface Lewis acid/base coordination, which conducive improving conductivity film accelerating electron extraction. other modification assists formation high‐quality with low density due its strong interaction PbI . Consequently, PBGH‐modified exhibits a champion 24.79%, highest PCEs among all FACsPbI 3 ‐based PSCs reported date. In addition, stabilities films devices under high temperature/humidity light illumination conditions also studied.

Language: Английский

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Optimizing the Buried Interface in Flexible Perovskite Solar Cells to Achieve Over 24% Efficiency and Long‐Term Stability

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(7)

Published: Oct. 7, 2023

The buried interface of the perovskite layer has a profound influence on its film morphology, defect formation, and aging resistance from outset, therefore, significantly affects quality device performance derived solar cells. Especially for FAPbI

Language: Английский

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Pushing the Limit of Open‐Circuit Voltage Deficit via Modifying Buried Interface in CsPbI₃ Perovskite Solar Cells

Advanced Materials, Journal Year: 2022, Volume and Issue: 35(7)

Published: Nov. 19, 2022

Although CsPbI3 perovskites have shown tremendous potential in the photovoltaic field owing to their excellent thermal stability, device performance is seriously restricted by severe photovoltage loss. The buried titanium oxide/perovskite interface plays a critical role interfacial charge transport and perovskite crystallization, which closely related open-circuit voltage deficit stemming from nonradiative recombination. Herein, target molecules named 3-sulphonatopropyl acrylate potassium salts are deliberately employed with special functional groups for modifying interface, giving rise favorable functions terms of passivating defects, optimizing energetic alignment, facilitating crystallization. Experimental characterizations theoretical calculations reveal that modification inhibits electron transfer barrier simultaneously improves crystal quality, thereby reducing trap-assisted recombination Consequently, omnibearing regarding endows devices an impressive efficiency 20.98%, achieving record-low VOC 0.451 V. as-proposed strategy renders universal prescription push limit deficit, showing promising future developing high-performance all-inorganic photovoltaics.

Language: Английский

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Strain Control to Stabilize Perovskite Solar Cells

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(48)

Published: Sept. 19, 2022

Abstract Perovskite solar cells (PSCs) are rivaling most commercial photovoltaics in the aspect of efficiency and cost, while their intrinsic instability remains a major concern for practical deployment. The presence undesirable strain PSCs during device fabrication operation refers to extension/narrowing chemical bonds expansion/shrinkage lattice volume, which largely affects stability due promoted phase transition, decomposition, mechanical fragility. Pioneering investigations remarkable achievements have revealed that control is indispensable design stable PSCs. Herein, evolution perovskite thin films its effect on performance elucidated, state‐of‐the‐art strategies modulation systematically reviewed. A thorough understanding cautious strain‐related phenomenon pave pathway derive materials with desired properties.

Language: Английский

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Managing Interfacial Defects and Carriers by Synergistic Modulation of Functional Groups and Spatial Conformation for High‐Performance Perovskite Photovoltaics Based on Vacuum Flash Method

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(23)

Published: April 7, 2023

Interfacial nonradiative recombination loss is a huge barrier to advance the photovoltaic performance. Here, one effective interfacial defect and carrier dynamics management strategy by synergistic modulation of functional groups spatial conformation ammonium salt molecules proposed. The surface treatment with 3-ammonium propionic acid iodide (3-APAI) does not form 2D perovskite passivation layer while propylammonium ions 5-aminopentanoic hydroiodide post-treatment lead formation layers. Due appropriate alkyl chain length, theoretical experimental results manifest that COOH NH3+ in 3-APAI can coordination bonding undercoordinated Pb2+ ionic hydrogen octahedron PbI64- , respectively, which makes both be simultaneously firmly anchored on films. This will strengthen effect improve transport transfer. confers better than 3-APAI-modified device based vacuum flash technology achieves an alluring peak efficiency 24.72% (certified 23.68%), among highly efficient devices fabricated without antisolvents. Furthermore, encapsulated degrades less 4% after 1400 h continuous sun illumination.

Language: Английский

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Surface Energy Engineering of Buried Interface for Highly Stable Perovskite Solar Cells with Efficiency Over 25%

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(2)

Published: Oct. 21, 2023

The abundant oxygen-related defects (e.g., O vacancies, O-H) in the TiO

Language: Английский

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Amphoteric Ion Bridged Buried Interface for Efficient and Stable Inverted Perovskite Solar Cells

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(1)

Published: Nov. 15, 2023

Abstract Synergistic morphology and defects management at the buried perovskite interface are challenging but crucial for further improvement of inverted solar cells (PerSCs). Herein, an amphoteric organic salt, 2‐(4‐fluorophenyl)ethylammonium‐4‐methyl benzenesulfonate (4FPEAPSA), is designed to optimize film energy level alignment interface. 4FPEAPSA treatment promotes growth a void‐free, coarse‐grained, hydrophobic by inducing crystal orientation. Besides, dual‐functional can chemically interact with film, passivate iodine formamidine vacancies, tending revert fermi its defect‐free state. Meanwhile, formation p‐type doping facilitate interfacial charge extraction transport PerSCs reduced carrier recombination loss. Consequently, improves efficiency devices 25.03% better storage, heat, humidity stability. This work contributes strengthening systematic understanding interface, providing synergetic approach realize precise control, effective defect suppression, efficient PerSCs.

Language: Английский

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