Pre‐Buried ETL with Bottom‐Up Strategy Toward Flexible Perovskite Solar Cells with Efficiency Over 23%

Advanced Functional Materials, Год журнала: 2023, Номер 33(28)

Опубликована: Апрель 4, 2023

Abstract With rapid development of photovoltaic technology, flexible perovskite solar cells (f‐PSCs) have attracted much attention for their light weight, high flexibility and portability. However, the power conversion efficiency (PCE) achieved so far is not yet comparable to that rigid devices. This mainly due great challenge depositing homogeneous high‐quality films on substrate. In this study, pre‐buried 3‐aminopropionic acid hydroiodide (3AAH) additives into electron transport layer (ETL) modified ETL/perovskite (PVK) interface by a bottom‐up strategy. 3AAH treatment induced templated grain growth improved quality ETL. By this, residual stresses generated in PVK during annealing‐cooling process are released converted micro‐compressive stresses. As result, defect density f‐PSCs with reduced performance greatly improved, reaching an exceptional PCE 23.36%. strategy provides new idea bridge gap between

Язык: 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, Год журнала: 2023, Номер 35(23)

Опубликована: Апрель 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.

Язык: Английский

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Intermediate Phase Engineering with 2,2‐Azodi(2‐Methylbutyronitrile) for Efficient and Stable Perovskite Solar Cells

Advanced Materials, Год журнала: 2023, Номер 35(23)

Опубликована: Март 24, 2023

Sequential deposition has been widely employed to modulate the crystallization of perovskite solar cells because it can avoid formation nucleation centers and even initial in precursor solution. However, challenges remain overcoming incomplete random transformation PbI2 films with organic ammonium salts. Herein, a unique intermediate phase engineering strategy developed by simultaneously introducing 2,2-azodi(2-methylbutyronitrile) (AMBN) both salt solutions regulate crystallization. AMBN not only coordinates form favorably mesoporous film due coordination between Pb2+ cyano group (C≡N), but also suppresses vigorous activity FA+ ions interacting FAI, leading full preferred orientation. Therefore, perovskites favorable facet orientations are obtained, defects largely suppressed owing passivation uncoordinated . As result, champion power conversion efficiency over 25% stabilized 24.8% is achieved. Moreover, device exhibits an improved operational stability, retaining 96% under 1000 h continuous white-light illumination intensity 100 mW cm-2 at ≈55 °C N2 atmosphere.

Язык: Английский

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24.64%‐Efficiency MA‐Free Perovskite Solar Cell with Voc of 1.19 V Enabled by a Hinge‐Type Fluorine‐Rich Complex

Advanced Functional Materials, Год журнала: 2023, Номер 33(11)

Опубликована: Янв. 1, 2023

Abstract High density of defects at interface severely affects the performance perovskite solar cells (PSCs). Herein, cobalt (II) hexafluoro‐2,4‐pentanedionat (CoFAc), a hinge‐type fluorine‐rich complex, is introduced onto surface formamidinium cesium lead iodide (FACsPbI 3 ) film to address issues perovskite/Spiro‐OMeTAD interface. The existence CoFAc passivates both organic cation and halide anion vacancies by establishing powerful hydrogen bonds with HC(NH 2 + (FA strong ionic Pb 2+ in films. In addition, serves as connecting link enhance interfacial hole‐transport kinetics via interacting Spiro‐OMeTAD. Consequently, FACsPbI PSCs modification display champion power conversion efficiency (PCE) 24.64% charming open‐circuit voltage ( V OC 1.191 V, which record among all reported organic‐inorganic hybrid TiO electron transport layer. Furthermore, CoFAc‐modified devices exhibit an outstanding long‐term stability, can maintain 95% their initial PCEs after exposure ambient atmosphere for 1500 h without any encapsulation.

Язык: Английский

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Enlarging moment and regulating orientation of buried interfacial dipole for efficient inverted perovskite solar cells

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Фев. 1, 2025

Carrier transport and recombination at the buried interface of perovskite have seriously restricted further development inverted solar cells (PSCs). Herein, an interfacial dipolar chemical bridge strategy to address this issue is presented. 2-(Diphenylphosphino) acetic acid (2DPAA) selected as linker reconstruct dipole, which effectively enlarges dipole moment 5.10 D optimizes a positive orientation, thereby accelerating vertical hole transport, suppressing nonradiative promoting crystallization. The champion device yields high power conversion efficiency (PCE) 26.53% (certified 26.02%). Moreover, extended wide-bandgap large-area devices, delivers PCEs 22.02% 24.11%, respectively. optimized devices without encapsulation also demonstrate great long-term shelf operational stability. Our work highlights importance orientation realize efficient stable PSCs. hindered cells. Here, authors employ achieving maximum 24.11% for small-

Язык: Английский

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Passivating buried interface with multifunctional novel ionic liquid containing simultaneously fluorinated anion and cation yielding stable perovskite solar cells over 23% efficiency

Journal of Energy Chemistry, Год журнала: 2022, Номер 69, С. 659 - 666

Опубликована: Фев. 19, 2022

Язык: Английский

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Molecular Bridge Assisted Bifacial Defect Healing Enables Low Energy Loss for Efficient and Stable Perovskite Solar Cells

Advanced Functional Materials, Год журнала: 2022, Номер 32(52)

Опубликована: Окт. 26, 2022

Abstract Interface engineering is of paramount importance for optimizing carrier dynamics and stability perovskite solar cells (PSCs), but little attention has been paid to understanding managing the buried interfaces. Here, a molecular bridge strategy developed modify properties interfaces in n–i–p PSCs by introducing multi‐functional additive 2‐Hydroxyethyl trimethylammonium chloride (ChCl) bottom SnO 2 electron transport layer. The ChCl treatment enables bifacial defects passivation improved quality, leading notably enhanced extraction suppressed non‐radiative recombination at As result, significantly power conversion efficiency (PCE) from 20.0% 23.07% with remarkable open‐circuit voltage ( V oc ) up 1.193 achieved, along superior (up 4000 h) unsealed devices under different conditions (moisture, heat maximum point). Furthermore, this demonstrates ability release stress thin film simultaneously strengthen interfacial toughness flexible PSCs, yielding mechanical champion PCE 21.50%. This study offers deep insights into provides effective strategies further enhance performance PSCs.

Язык: Английский

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Recent progress in improving strategies of inorganic electron transport layers for perovskite solar cells

Nano Energy, Год журнала: 2022, Номер 104, С. 107918 - 107918

Опубликована: Окт. 20, 2022

Язык: Английский

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Recent Progress on Heterojunction Engineering in Perovskite Solar Cells

Advanced Energy Materials, Год журнала: 2022, Номер 13(33)

Опубликована: Сен. 1, 2022

Abstract Metal halide perovskite solar cells (PSCs) have become one of the most promising next‐generation photovoltaic technologies due to their low‐cost fabrication, solution processability, and superior optoelectronic properties. Although state‐of‐art PSCs demonstrate a power conversion efficiency record comparable that silicon cells, there are still many challenges toward commercialization. devices based on various semiconductor heterojunctions all play important roles in device performance. The operation relies combination multiple offer delicate control photocarrier generation, separation, transport respective electrodes. Hence, advanced heterojunction design is crucial for further improvement Notably, records mainly ascribed optimized engineering. Considering significance this topic, comprehensive review recently developed designs presented. Following brief introduction PSC architectures, operation, fundamental theories, recent progress perovskite/electron layer, perovskite/hole perovskite/perovskite engineering elaborated. Finally, conclusions perspectives research field addressed.

Язык: Английский

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Modulating preferred crystal orientation for efficient and stable perovskite solar cells—From progress to perspectives

InfoMat, Год журнала: 2022, Номер 4(10)

Опубликована: Сен. 14, 2022

Abstract The perovskite solar cell (PSC) has been recognized as a promising candidate for the next generation of photovoltaics due to its excellent power conversion efficiency (PCE), potential low cost and straightforward solution preparation processes. With efforts around world, PCE PSCs reached 25.7%. As film is most important part PSC, quality dramatically affects stability PSC. Numerous works have focused on controlling crystallization realize oriented growth films. Particularly, considering photoelectric anisotropy materials, it very meaningful investigate relationship between preferred crystal orientation device stability. This review highlights various approaches realizing polycrystalline films, including optimizing precursor annealing process, additive engineering, interface engineering. Furthermore, key factors affecting are carefully discussed, which provides effective guidance obtain highly‐oriented films highly efficient stable PSCs. image

Язык: Английский

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