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

Advanced Materials, Год журнала: 2023, Номер 36(7)

Опубликована: Окт. 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

Язык: Английский

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Synergic Electron and Defect Compensation Minimizes Voltage Loss in Lead‐Free Perovskite Solar Cells

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(39)

Опубликована: Июнь 16, 2023

Abstract Sn perovskite solar cells have been regarded as one of the most promising alternatives to Pb‐based counterparts due their low toxicity and excellent optoelectronic properties. However, perovskites are notorious feature heavy p‐doping characteristics possess abundant vacancy defects, which result in under‐optimized interfacial energy level alignment severe nonradiative recombination. Here, we reported a synergic “electron defect compensation” strategy simultaneously modulate electronic structures profiles via incorporating traced amount (0.1 mol %) heterovalent metal halide salts. Consequently, doping modified was altered from p‐type weak (i.e. up‐shifting Fermi by ∼0.12 eV) that determinately reducing barrier charge extraction effectively suppressing recombination loss throughout bulk film at relevant interfaces. Pioneeringly, resultant device with electron compensation realized champion efficiency 14.02 %, is ∼46 % higher than control (9.56 %). Notably, record‐high photovoltage 1.013 V attained, corresponding lowest voltage deficit 0.38 eV date, narrowing gap analogues (∼0.30 V).

Язык: Английский

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Dual‐Strategy Tailoring Molecular Structures of Dopant‐Free Hole Transport Materials for Efficient and Stable Perovskite Solar Cells

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(20)

Опубликована: Март 19, 2024

Abstract Dopant‐free hole transport materials (HTMs) are ideal for highly efficient and stable n‐i‐p perovskite solar cells (PSCs), but most current design strategies tailoring the molecular structures of HTMs limited to single strategy. Herein, four based on dithienothiophenepyrrole (DTTP) core devised through dual‐strategy methods combining conjugate engineering side chain engineering. DTTP‐ThSO with ester alkyl that can form six‐membered ring by S⋅⋅⋅O noncovalent conformation lock thiophene in backbone shows good planarity, high‐quality film, matching energy level high mobility, as well strong defect passivation ability. Consequently, a remarkable power conversion efficiency (PCE) 23.3 % nice long‐term stability is achieved dopant‐free DTTP‐ThSO‐based PSCs, representing one highest values un‐doped organic PSCs. Especially, fill factor (FF) 82.3 value small HTMs‐based PSCs date. Moreover, devices have an excellent PCE 20.9 large‐area (1.01 cm 2 ) devices. This work clearly elucidates structure‐performance relationships offers practical approach designing high‐performance

Язык: Английский

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3D Conjugated Hole Transporting Materials for Efficient and Stable Perovskite Solar Cells and Modules

Advanced Materials, Год журнала: 2024, Номер 36(28)

Опубликована: Май 8, 2024

Abstract The orthogonal structure of the widely used hole transporting material (HTM) 2,2′,7,7′‐tetrakis(N, N‐di‐p‐methoxyphenylamino)−9,9′‐spirobifluorene (Spiro‐OMeTAD) imparts isotropic conductivity and excellent film‐forming capability. However, inherently weak intra‐ inter‐molecular π – interactions result in low intrinsic mobility. Herein, a novel HTM, termed FTPE‐ST, with twist conjugated dibenzo(g,p)chrysene core coplanar 3,4‐ethylenedioxythiophene (EDOT) as extended donor units, is designed to enhance interactions, without compromising on solubility. three‐dimensional (3D) configuration provides multi‐direction charge transport well solubility even 2‐methylanisole, its large backbone endows HTM high Moreover, sulfur donors EDOT units coordinate lead ions perovskite surface, leading stronger interfacial suppression defects at perovskite/HTM interface. As result, solar cells (PSCs) employing FTPE‐ST achieve champion power conversion efficiency (PCE) 25.21% long‐time stability, one highest PCEs for non‐spiro HTMs n‐i‐p PSCs. In addition, capacity enables fabrication FTPE‐ST‐based large‐scale PSCs (1.0 cm 2 ) modules (29.0 ), which 24.21% (certificated 24.17%) 21.27%, respectively.

Язык: Английский

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A comparison of molecular iodine evolution on the chemistry of lead and tin perovskites

Energy & Environmental Science, Год журнала: 2024, Номер 17(10), С. 3244 - 3269

Опубликована: Янв. 1, 2024

The development of new strategies which target simultaneous adsorption corrosive iodine (I 2 ), facilitate reduction into I − and reintroduction within the crystal lattice are highly promising for addressing longevity perovskite-based devices.

Язык: Английский

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Ultrathin polymer membrane for improved hole extraction and ion blocking in perovskite solar cells

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Дек. 30, 2024

Highly efficient perovskite solar cells (PSCs) in the n-i-p structure have demonstrated limited operational lifetimes, primarily due to layer-to-layer ion diffusion perovskite/doped hole-transport layer (HTL) heterojunction, leading conductivity drop HTL and component loss perovskite. Herein, we introduce an ultrathin (~7 nm) p-type polymeric interlayer (D18) with excellent ion-blocking ability between address these issues. The D18 effectively inhibits of lithium, methylammonium, formamidium, iodide ions. Additionally, improves energy-level alignment at perovskite/HTL interface facilitates hole extraction. resulting PSCs achieve efficiencies 26.39 (certified 26.17) 25.02% aperture areas 0.12 1.00 square centimeters, respectively. Remarkably, devices retain 95.4% initial efficiency after 1100 hours operation maximum power point tracking, representing significant stability advancements for high-efficiency PSCs.

Язык: Английский

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Ferrocene Derivatives for Improving the Efficiency and Stability of MA‐Free Perovskite Solar Cells from the Perspective of Inhibiting Ion Migration and Releasing Film Stress

Advanced Science, Год журнала: 2023, Номер 10(35)

Опубликована: Окт. 22, 2023

Further improvement of the performance and stability inverted perovskite solar cells (PSCs) is necessary for commercialization. Here, ferrocene derivative dibenzoylferrocene (DBzFe) used as an additive to enhance MA- Br- free PSCs. The results show that introduction DBzFe not only passivates defects in film but also inhibits ion migration film. final device achieves a power conversion efficiency (PCE) 23.53%, which one highest efficiencies currently based on self-assembled monolayers (SAMs). Moreover, it maintains more than 96.4% original when running continuously 400 h at maximum point.

Язык: Английский

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Dopant‐free Starlike Molecular Hole Conductor with Ordered Packing for Durable all‐Inorganic Perovskite Solar Cells

Advanced Energy Materials, Год журнала: 2024, Номер 14(14)

Опубликована: Янв. 24, 2024

Abstract All‐inorganic n‐i‐p perovskite solar cells (PSCs) using doped Spiro‐OMeTAD as hole transport material (HTM) suffer from photothermal stability due to ionic diffusion and radical‐induced degradation by the dopants. In this article, dopant‐free starlike molecule (N2, N2‐bis(4‐(bis(4‐methoxyphenyl)amino)phenyl)‐N5,N5‐bis(4‐methoxyphenyl)pyridine‐2,5‐diamine (BD)) is synthesized engineer stacking properties delivered higher mobility than (3.2 × 10 −4 versus 1.76 cm 2 V −1 s ) HTM. Starlike BD HTM has a twisted acceptor unit strong dipole, forming crystalline ordered packing film ensure intramolecular charge transfer improve mobility. The CsPbI 3 PSCs deliver maximum efficiency of 19.19%, which highest performance for all‐inorganic based on HTMs. Meanwhile, molecules‐packing blocks migration channel I − ions metal electrodes improves device stability. BD‐based devices maintain more 93% 80% initial after 85 °C storage 35 days power point (MPP) tracking at 1000 h, respectively.

Язык: Английский

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One Stone, Two Birds: High-Brightness Aggregation-Induced Emission Photosensitizers for Super-Resolution Imaging and Photodynamic Therapy

Nano Letters, Год журнала: 2024, Номер 24(10), С. 3005 - 3013

Опубликована: Фев. 28, 2024

Most aggregation-induced emission (AIE) luminogens exhibit high brightness, excellent photostability, and good biocompatibility, but these AIE-active agents, which kill two birds with one stone to result in applications both stimulated depletion (STED) super-resolution imaging photodynamic therapy (PDT), have not been reported yet are urgently needed. To meet the requirements of STED nanoscopy PDT, D-A-π-A-D type DTPABT-HP is designed by tuning conjugated π spacers. It exhibits red-shifted emission, PLQY 32.04%, impressive 1O2 generation (9.24 fold compared RB) nanoparticles (NPs). Then, NPs applied cell via nanoscopy, especially visualizing dynamic changes lysosomes PDT process at ultrahigh resolution. After that, vivo was also conducted NPs, resulting significantly inhibited tumor growth, an inhibition rate 86%. The work here beneficial design multifunctional agents deep understanding their phototheranostic mechanism biological research.

Язык: Английский

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Donor engineering of a benzothiadiazole-based D–A–D-type molecular semiconductor for perovskite solar cells: a theoretical study

Physical Chemistry Chemical Physics, Год журнала: 2024, Номер 26(8), С. 6817 - 6825

Опубликована: Янв. 1, 2024

Based on the D–A–D scaffold, six benzothiadiazole-based HTMs are tailored by using phenoxazine, phenothiazine and carbazole as donors, their electronic, optical, hole-transporting interfacial properties evaluated theoretically.

Язык: Английский

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