Interface Modification for Efficient and Stable Inverted Inorganic Perovskite Solar Cells

Advanced Materials, Год журнала: 2023, Номер 35(31)

Опубликована: Июнь 7, 2023

Due to their excellent thermal stability and ideal bandgap, metal halide inorganic perovskite based solar cells (PSCs) with inverted structure are considered as an choice for perovskite/silicon tandem cells. However, the power conversion efficiency (PCE) of still lags far behind that conventional n-i-p PSCs due interfacial energy level mismatch high nonradiative charge recombination. Herein, performance is significantly improved by engineering CsPbI3-x Brx films 2-mercapto-1-methylimidazole (MMI). It found mercapto group can preferably react undercoordinated Pb2+ from forming Pb-S bonds, which appreciably reduces surface trap density. Moreover, MMI modification results in a better alignment electron-transporting material, promoting carrier transfer reducing voltage deficit. The above combination open-circuit enhancement 120 mV, yielding champion PCE 20.6% 0.09 cm2 area 17.3% 1 area. Furthermore, ambient, operational heat stabilities also greatly improved. work demonstrates simple but effective approach fabricating highly efficient stable PSCs.

Язык: Английский

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Alkyl ammonium iodide-based ligand exchange strategy for high-efficiency organic-cation perovskite quantum dot solar cells

Nature Energy, Год журнала: 2024, Номер 9(3), С. 324 - 332

Опубликована: Янв. 26, 2024

Язык: Английский

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Antisolvent‐Assisted In Situ Cation Exchange of Perovskite Quantum Dots for Efficient Solar Cells

Advanced Materials, Год журнала: 2023, Номер 35(21)

Опубликована: Фев. 26, 2023

Cesium-formamidinium lead iodide perovskite quantum dots (FAx Cs1-x PbI3 PQDs) show high potential for next-generation photovoltaics due to their outstanding optoelectronic properties. However, achieving composition-tunable hybrid PQDs with desirable charge transport remains a significant challenge. Herein, by leveraging an antisolvent-assisted in situ cation exchange of PQDs, homogeneous FAx controllable stoichiometries and surface ligand chemistry are realized. Meanwhile, the crystallographic stability is substantially improved substituting cations mediated vacancies. Consequently, PQD solar cell delivers efficiency 17.29%, highest value among homostructured cells. The photovoltaic performance attributed broadened light harvesting spectra, flattened energy landscape, rationalized levels highly oriented solids, leading efficient carrier extraction. This work provides feasible approach stoichiometry regulation finely tailor properties tolerance factors toward high-performing photovoltaics.

Язык: Английский

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Dipolar Chemical Bridge Induced CsPbI₃ Perovskite Solar Cells with 21.86 % Efficiency

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(18)

Опубликована: Март 4, 2024

Abstract CsPbI 3 perovskite receives tremendous attention for photovoltaic applications due to its ideal band gap and good thermal stability. However, solar cells (PSCs) significantly suffer from photovoltage deficits because of serious interfacial energy losses within the PSCs, which a large extent affects performance PSCs. Herein, dipolar chemical bridge (DCB) is constructed between TiO 2 layers lower thus improve charge extraction The results reveal that DCB could form beneficial dipole layers, optimize energetics perovskite/TiO level alignment Meanwhile, also simultaneously passivate surface defects greatly lowering recombination. Consequently, deficit PSCs largely reduced, leading record efficiency 21.86 % being realized. operation stability improved high‐quality films with released tensile strain obtained after forming

Язык: Английский

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Stabilizing CsPbI3 perovskite for photovoltaic applications

Matter, Год журнала: 2023, Номер 6(3), С. 691 - 727

Опубликована: Янв. 12, 2023

Язык: Английский

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Perovskite Quantum Dot Solar Cells: Current Status and Future Outlook

ACS Energy Letters, Год журнала: 2024, Номер 9(1), С. 308 - 322

Опубликована: Янв. 2, 2024

Metal halide perovskite quantum dots (PQDs) not only share the common feature of confinement effect found in traditional but also exhibit favorable characteristics materials, including defect tolerance and long exciton lifetime. Thanks to these merits, within ten years research development, dot-based solar cells (PQDSCs) have attained a certified power conversion efficiency (PCE) 18.1%, which is, however, still far below those market-dominant silicon bulk thin-film counterparts. In this Focus Review, we analyze state-of-the-art development PQDSCs propose innovative strategies surface management, compositional control, band-alignment design. The potential utilizing PQDs' multiple generation is further discussed with good hope improving PCE beyond Shockley–Queisser limit.

Язык: Английский

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Perovskite heteroepitaxy for high-efficiency and stable pure-red LEDs

Nature, Год журнала: 2025, Номер unknown

Опубликована: Фев. 19, 2025

Язык: Английский

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Ligand‐Assisted Coupling Manipulation for Efficient and Stable FAPbI₃ Colloidal Quantum Dot Solar Cells

Angewandte Chemie International Edition, Год журнала: 2022, Номер 62(5)

Опубликована: Ноя. 11, 2022

For emerging perovskite quantum dots (QDs), understanding the surface features and their impact on materials devices is becoming increasingly urgent. In this family, hybrid FAPbI3 QDs (FA: formamidium) exhibit higher ambient stability, near-infrared absorption sufficient carrier lifetime. However, suffer from difficulty in modulating ligand, which essential for constructing conductive QD arrays photovoltaics. Herein, assisted by an ionic liquid formamidine thiocyanate, we report a facile reconfiguration methodology to modulate manipulate electronic coupling of QDs, exploited enhance charge transport fabricating high-quality photovoltaic devices. Finally, record-high efficiency approaching 15 % achieved solar cells, they retain over 80 initial after aging environment (20-30 humidity, 25 °C) 600 h.

Язык: Английский

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In Situ Ligand Compensation of Perovskite Quantum Dots for Efficient Light-Emitting Diodes

ACS Energy Letters, Год журнала: 2023, Номер 8(10), С. 4386 - 4396

Опубликована: Сен. 27, 2023

Perovskite quantum dots (PQDs) have emerged as one of the most promising optoelectronic materials. However, oleic acid (OA)/oleylamine (OAm) ligands significantly suffer from detachment PQD surface due to reversible protonated and deprotonated processes OA OAm ligands, predominantly affecting properties PQDs. Herein, an in situ ligand compensation (ILC) strategy is demonstrated repair defective PQDs through a nucleophilic substitution reaction, which could simultaneously passivate cesium bromide ion vacancies on surface, substantially suppressing defect-assisted nonradiative recombination. Meanwhile, ILC treatment would also dynamically remove part pristine OA/OAm improves electronic coupling crystalline orientation PQDs, thereby facilitating charge transport within solids. Consequently, PQD-based light-emitting diode yields external efficiency up 23.45% with highest luminance 109427 cd m–2, among values green-emitting diodes.

Язык: Английский

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In Situ Iodide Passivation Toward Efficient CsPbI3 Perovskite Quantum Dot Solar Cells

Nano-Micro Letters, Год журнала: 2023, Номер 15(1)

Опубликована: Июнь 29, 2023

All-inorganic CsPbI3 quantum dots (QDs) have demonstrated promising potential in photovoltaic (PV) applications. However, these colloidal perovskites are vulnerable to the deterioration of surface trap states, leading a degradation efficiency and stability. To address issues, facile yet effective strategy introducing hydroiodic acid (HI) into synthesis procedure is established achieve high-quality QDs devices. Through an in-depth experimental analysis, introduction HI was found convert PbI2 highly coordinated [PbIm]2−m, enabling control nucleation numbers growth kinetics. Combined optical structural investigations illustrate that such technique beneficial for achieving enhanced crystallinity reduced density crystallographic defects. Finally, effect further reflected on PV performance. The optimal device significantly improved power conversion 15.72% along with storage This illuminates novel simple methodology regulate formed species during synthesis, shedding light understanding solar cell performance, aiding design future protocols high-performance optoelectronic

Язык: Английский

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