Solution-processed perovskite (PSC) solar cells have achieved extremely high power conversion efficiencies (PCEs) over 20%, but practical application of this photovoltaic technology requires further advancements on both long-term stability and large-area device demonstration. Here, an additive-engineering strategy is developed to realize a facile convenient fabrication method uniform films composed large crystal size low density defects. The crystalline quality the found simultaneously...

Abstract We report herein the discovery of methylamine (CH 3 NH 2 ) induced defect‐healing (MIDH) CH PbI perovskite thin films based on their ultrafast (seconds), reversible chemical reaction with gas at room temperature. The key to this healing behavior is formation and spreading an intermediate ⋅ x liquid phase during unusual perovskite–gas interaction. demonstrate versatility scalability MIDH process, show dramatic enhancement in performance solar cells (PSCs) MIDH. This study represents...

Studies on doping and alloying for the advancement of perovskite solar cells are critically reviewed.

Carbonyl functional materials as additives are extensively applied to reduce the defects density of perovskite film. However, there is still a lack comprehensive understanding for effect carbonyl improve device performance. In this work, we systematically study additive molecules on passivation in films. After investigation, results confirm importance molecular dipole amplifying molecules. The with strong possesses advantages enhancing efficiency and stability solar cells (PSCs)....

High-performance perovskite solar cells have demonstrated commercial viability, but still face the risk of contamination from lead leakage and long-term stability problems caused by defects. Here, an organic small molecule (octafluoro-1,6-hexanediol diacrylate) is introduced into film to form a polymer through in situ thermal crosslinking, which carbonyl group anchors uncoordinated Pb2+ reduces lead, along with -CF2 - hydrophobic protecting water invasion. Additionally, passivates varieties...

Tin–lead (Sn–Pb) alloyed perovskites are promising candidates for next-generation photovoltaics due to their appropriate bandgaps multijunction tandem solar cells, which can potentially overcome the Shockley-Queisser limit. However, power conversion efficiency (PCE) and stability still impeded by poor absorber quality defects caused oxidation of Sn2+. Here, we introduced trimethylsulfoxonium iodide (TMSI) as an additive along with SnF2 fabricate Sn–Pb perovskite films enlarged grains...

Introducing fluorine (F) groups into a passivator plays an important role in enhancing the defect passivation effect for perovskite film, which is usually attributed to direct interaction of F and states. However, between electronegative electron-rich same molecule, may influence effect, ignored. We herein report that such interactions can vary electron cloud distribution around thus changing their coordination with sites. By comparing two fluorinated molecules, heptafluorobutylamine (HFBM)...

Abstract The rapid relaxation of hot carriers leads to energy loss in the form heat and consequently restricts theoretical efficiency single‐junction solar cells; However, this issue has not received much attention tin‐lead perovskites cells. Herein, tin(II) oxalate (SnC 2 O 4 ) is introduced into perovskite precursor solution regulate hot‐carrier cooling dynamics. addition SnC increases length carrier diffusion, extends lifetime carriers, simultaneously slows down rate carriers....

Abstract Mixed Sn-Pb perovskites have emerged as promising photovoltaic materials for both single- and multi-junction solar cells. However, achieving their scale-up practical application requires further enhancement in stability. We identify that poor thermal conductivity results insufficient transfer, leading to heat accumulation within the absorber layer accelerates degradation. A regulation strategy by incorporating carboranes into is developed; these are electron-delocalized carbon-boron...

In this review, we present recent advances in interface engineering at different interfaces perovskite solar cells.

We demonstrate the feasibility of a nonsalt-based precursor pair--inorganic HPbI3 solid and organic CH3NH2 gas--for deposition uniform CH3NH3PbI3 perovskite thin films. The strong room-temperature solid-gas interaction between induces transformative evolution ultrasmooth, full-coverage films at rapid rate (in seconds) from nominally processed rough, partial-coverage chemical origin this behavior is elucidated via in situ experiments. Perovskite solar cells, fabricated using MAPbI3 thus...

Abstract Low‐temperature‐processed perovskite solar cells (PSCs), which can be fabricated on rigid or flexible substrates, are attracting increasing attention because they have a wide range of potential applications. In this study, the stability reduced graphene oxide and ability poly(triarylamine) underlayer to improve quality overlying films construct hole‐transport bilayer by means low‐temperature method taken advantage of. The is used in both inverted planar PSCs with following...

Effective passivation and stabilization of both the inside interface a perovskite layer are crucial for solar cells (PSCs), in terms efficiency, reproducibility, stability. Here, first formamidinium lead iodide (δ-FAPbI3 ) polymorph passivated stabilized MAPbI3 PSCs reported. This novel /δ-FAPbI3 structure is realized via treating mixed organic cation MA x FA1-x PbI3 film with methylamine (MA) gas. In addition to morphology healing, gas can also induce formation δ-FAPbI3 phase within film....

Abstract State‐of‐the‐art perovskite solar cells (PSCs) have bandgaps that are invariably larger than 1.45 eV, which limits their theoretically attainable power conversion efficiency. The emergent mixed‐(Pb, Sn) perovskites with of 1.2–1.3 eV ideal for single‐junction according to the Shockley–Queisser limit, and they potential deliver higher Nevertheless, high chemical activity Sn(II) in these makes it extremely challenging control physical properties stability, thereby leading PSCs...

Hole-transporting material (HTM) is an indispensable constituent in organic electronic devices, generally comprising a donor/dopant combination. We report that disodium salt of substituted benzo[1,2- b:4,5- b']dipyrrole bearing two racemic alkanediylsulfonate anion side chains (BDPSOs) serves as neutral, nonhygroscopic, dopant-free HTM for lead perovskite (MAPbI3) solar cells. These organic/inorganic hybrid molecules are useful tunable orbital level and controllable solubility. A fluorinated...

Abstract Molecular doping is an of significance approach to reduce defects density perovskite and improve interfacial charge extraction in solar cells. Here, we show a new strategy for chemical via organic small molecule, which features fused tricyclic core, showing strong intermolecular π‐Pb 2+ interactions with under‐coordinated Pb perovskite. This could the suppress nonradiative recombination, was also confirmed by functional theory calculations. In addition, this deepen surface potential...

Abstract Metal halide perovskite solar cells (PSCs) have witnessed a swift increase in power conversion efficiency the past decade, emerging as one of most promising next‐generation photovoltaic technologies for commercialization and low‐carbon energy generation. Through significant efforts optimizing processing techniques, high‐quality thin films can now be prepared with polycrystalline morphologies consisting monolayer grains. Nevertheless, defects microstructural disorders still form at...

The migration of ions is known to be associated with various detrimental phenomena, including current density-voltage hysteresis, phase segregation, etc., which significantly limit the stability and performance perovskite solar cells, impeding their progress toward commercial applications. To address these challenges, we propose incorporating a polymerizable organic small molecule monomer, N-carbamoyl-2-propan-2-ylpent-4-enamide (Apronal), into film form crosslinked polymer (P-Apronal)...

SnO2 has been widely employed as the electron transport layer in n–i–p perovskite solar cells owing to its remarkable characteristics, such easy preparation, high light transmittance, and excellent chemical stability. However, they are characterized by uneven colloidal dispersion, surface oxygen vacancies, energy misalignment with layer. In this study, a multifunctional modification approach was adopted integrating aminomethanesulfonic acid (AMSA) molecules, an amphoteric structure, into...

With NH₄PbI₃ as the starting material, an organic cation exchange concept is employed to fabricate high-quality α-FAPbI₃ perovskite thin films.

Methylammonium lead trihalide perovskites are attracting intensive interest due to its high photovoltaic performance, low cost and one-step solution processability. Since the morphology of perovskite thin films play central role on cell a plethora methods have been developed fabricate uniform film. Herein, we demonstrate that an innovative approach by applying mixed salts (PbI2 + PbCl2) facilitate reproducible fabrication compact It is proposed rapid reaction kinetics PbI2 with MAI enables...