It is still a challenge to fabricate a smooth, high-quality perovskite film under ambient conditions via an inkjet printing process. Here, we report a systematic study of the fabrication of one-step inkjet-printed metal halide perovskite (IJP-MHP) films under ambient conditions. An inkjet-printed perovskite film with full surface coverage and large columnar grains was obtained through in situ heat treatment, self-vapor annealing (self-VA), and solvent engineering. An efficiency of 13.44% was achieved for the perovskite solar cell (PSC) with an architecture of FTO/IJP-SnO x /IJP-MHP/IJP-spiro-OMeTAD/Au. Furthermore, an ink additive polyvinylpyrrolidone (PVP) and antisolvent extraction treatment were carried out to retard perovskite nucleation and grain growth. Resulting perovskite films with improved film morphology and uniformity were obtained, although they delivered no competitive performance. Further optimization can be conducted to improve efficiency by careful selection of ink additives.

The primary challenge for the commercialization of hybrid perovskite solar cells (PSCs) is their chemical and thermal instability as compared to Si devices. Herein, we demonstrate that PSCs spray-coated with polystyrene retain 80% of their efficiency after 40 hours immersed in water or at 95 degrees C.

The pursuit of p-type semiconductors has garnered considerable attention in academia and industry. Among the potential candidates, copper iodide (CuI) stands out as a highly promising p-type material due to its conductivity, cost-effectiveness, and low environmental impact. CuI can be employed to create thin films with >80% transparency within the visible range (400–750 nm) and utilizing various low-temperature, scalable deposition techniques. This review summarizes the deposition techniques for CuI as a hole-transport material and their performance in perovskite solar cells, thin-film transistors, and light-emitting diodes using diverse processing methods. The preparation methods of making thin films are divided into two categories: wet and neat methods. The advancements in CuI as a hole-transporting material and interface engineering techniques hold promising implications for the continued development of such devices.

Planar perovskite solar cells (PSCs) based on low-temperature solution-processed SnO<inf>2</inf> electron transport layers (ETLs) usually suffer from energy losses within SnO<inf>2</inf> ETLs or at SnO<inf>2</inf>/perovskite interfaces. Doping is an effective strategy to modify the properties of SnO<inf>2</inf> and reduce such energy losses. Herein, Ce ions are incorporated into solution-processed SnO<inf>x</inf> and Ce-doped SnO<inf>x</inf> ETLs are fabricated for planar PSCs via inkjet printing. The Ce-doped SnO<inf>x</inf> ETL shows enhanced conductivity and improved energy level alignment with the perovskite layer, which can facilitate charge extraction and transport capabilities. Ce doping also effectively passivates the surface defects of SnO<inf>x</inf>. The photoluminescence characterization reveals that the carrier recombination is suppressed within the perovskite film. As a result, an improved power conversion efficiency (PCE) of 15.77% is obtained for the planar PSC with a Ce-doped SnO<inf>x</inf> ETL, compared to that of 14.66% for the undoped device. Furthermore, this work demonstrates a sustainable fabrication method which has great potential for the upscaling of PSCs.

The current paper describes the formation of a new series of platinum(II) complexes with 5,7-di-tert-butyl-2-(thiophen-2-yl)benzo[d]oxazole (btbo) ligand. This study has focused on synthesis methods of some organoplatinum(II) complexes containing btbo ligand from two different reagents under different conditions. Furthermore, a detailed computational study was performed to identify the thermodynamic parameter's behavior. The synthesis was initiated from some complexes including cis-[PtCl2(dmso)(2)], R1, [PtCl2(COD)], R2 and a benzoxazole derivative as organic ligand 5,7-di-tert-butyl-2-(thiophen-2-yl)benzo[d]oxazole, (btbo). Implementation of the H-1 NMR analysis procedure on products reveals two isomers' existence. Moreover, the thermodynamic parameters, (Delta H degrees, Delta G degrees, Delta S degrees), were quantified to achieve a more precise understanding. The energy diagram examination and considering the quantified parameters present the stability and instability of each product which is in notable agreement with the experimental data.

Significant interest exists in water-tolerant 2D lead iodide perovskites owing to their stability and proven potential in photovoltaic and photonic applications. These materials have solid-state phase transitions that are accessible below 100 °C. Here, the study witnesses the multiple phase transitions of the last members of a series of organic–inorganic hybrid materials, [(CnH2n+1NH3)2PbI4], with even n as n = 14, 16, and 18, once again. By employing temperature-dependent steady-state photoluminescence (PL) and temperature-dependent time-resolved photoluminescence (TRPL) spectroscopy in the temperature range of −18 to +90 °C and at −196 °C, we explore the thermal responses of these materials. The investigation reveals reversible phase transitions occurring between room temperature (RT) and elevated temperatures, impacting the optical properties and emitting colors of the perovskite compounds. The longer the alkyl chain, the higher the phase transition temperature, attributed to increased conformational disorder and enhanced perovskite symmetry. The decay constants for all compounds are very close in value, which confirms the underlying excited-state dynamics, pointing to contributions primarily from inorganic components across different phases. We anticipate that our results on the detection of phase transitions in 2D perovskites will not only motivate the use of these techniques for detecting phase transitions but also would help to understand their excited states in more details to selectively use them for solar cell and next-generation display technologies.

Efficiency and stability are the two most important factors in commercially scalable solar cells. In spite the high-power conversion efficiencies (PCE), the commercialization of perovskite solar cells (PSC) has been limited due to their low stability under ambient conditions. Environmental factors like moisture, heat, and light can all adversely affect PSC performance and limit device lifetime. In this review, we refer to the literature addressing the moisture induced stability issue of perovskite based solar cells. We present an overview on the moisture stability of the perovskite solar cells and clarify the effect of moisture on different layers in perovskite solar cells and the corresponding degradation process. Then we extend the discussion highlighting the strategies to prevent the moisture induced degradation in hybrid perovskite solar cells. The methods include composition engineering (cation and halide engineering) and interfacial layer engineering/surface passivation. We further summarize the utilization of doping techniques and use of organic/Inorganic passivators. We address methods of producing moisture stable 2D perovskites and admixtures of 2D and 3D perovskites. Lastly, the review highlights research directions focused on improving perovskite stability without compromising power conversion efficiency.