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The commercial tin oxide (SnO2) colloidal suspension is widely utilized as an electron transport layer (ETL) in high‐performance perovskite solar cells (PSCs). However, despite significant efforts have been proposed to address bulk transport and interface recombination issues, the PSC efficiency is still limited to around 25%. In this study, the crucial role of the physicochemical characteristics of the SnO2 colloidal suspension in shaping the morphology, electrical properties, and optical properties of the SnO2 ETL is investigated. By controlling the pH value of the SnO2 solution with weak acids such as carbonic acid, the reassembly of metal oxide nanoparticles into smaller sizes with more homogeneous dispersion and dense interconnections is successfully induced. Consequently, the resulting SnO2 ETL exhibits enhanced crystallinity, high conductivity, low surface defects, and high optical transmittance. As a result, the efficiency of the target PSC is increased from 23.10% (control device) to 24.70%. This improvement is attributed to higher voltage, photocurrent, and fill factor compared to the relevant control samples. A similar device improvement using phosphoric acid is observed, indicating that the approach represents a universal technique to further enhance the quality of SnO2 ETL for large‐area, high‐efficiency, and stable PSCs. [ABSTRACT FROM AUTHOR]

Ionic liquid salts (ILs) are generally recognized as additives in perovskite precursor solutions to enhance the efficiency and stability of solar cells. However, the success of ILs incorporation as additives is highly dependent on the precursor formulation and perovskite crystallization process, posing challenges for industrial‐scale implementation. In this study, a room‐temperature spin‐coated IL, n‐butylamine acetate (BAAc), is identified as an ideal passivation agent for formamidinium lead iodide (FAPbI3) films. Compared with other passivation methods, the room‐temperature BAAc capping layer (BAAc RT) demonstrates more uniform and thorough passivation of surface defects in the FAPbI3 perovskite. Additionally, it provides better energy level alignment for hole extraction. As a result, the champion n–i–p perovskite solar cell with a BAAc capping layer exhibits a power conversion efficiency (PCE) of 24.76%, with an open‐circuit voltage (Voc) of 1.19 V, and a Voc loss of ≈330 mV. The PCE of the perovskite mini‐module with BAAc RT reaches 20.47%, showcasing the effectiveness and viability of this method for manufacturing large‐area perovskite solar cells. Moreover, the BAAc passivation layer also improves the long‐term stability of unencapsulated FAPbI3 perovskite solar cells, enabling a T80 lifetime of 3500 h when stored at 35% relative humidity at room temperature in an air atmosphere. [ABSTRACT FROM AUTHOR]

Metal halide perovskites (MHPs) have excellent optical properties such as good color purity, high photoluminescence quantum efficiency and low manufacturing cost. Inkjet printing （IJP） is a powerful technique to achieve high‐density pixelated perovskite microarrays. In the display industry, the problem of low color gamut caused by optical crosstalk is faced. In this paper, the preparation process of perovskite quantum dots on the color filter is studied. The combination of IJP and lithography technology, the use of black matrix to avoid crosstalk and inkjet printing to achieve accurate patterning, successfully prepared the color filter containing red and green perovskite quantum dots. This paper provides a reference for the implementation of wide color gamut display. [ABSTRACT FROM AUTHOR]

Quasi‐2D perovskites featuring with natural multiple quantum‐well structure are promising for achieving highly efficient blue light‐emitting diodes. The undesired domain distribution of quasi‐2D perovskites usually results in inefficient energy cascade and thereby inferior device performance. Here, we regular the domain distribution by incorporating propylamine hydrobromide (PABr) and n‐butylamine hydrobromide (BABr) into pristine perovskites to serve as dual spacers with phenylethylamine hydrobromide (PEABr), respectively. The modified perovskite films show narrower domain distribution and improved optical properties. We further fabricate the perovskite light‐emitting diodes (PeLEDs) based on the modified films. The best devices achieve a maximum external quantum efficiency (EQE) of 2.6%, which is 2.3‐fold to that of control devices. These results may provide a practical method to prepare highly efficient blue PeLEDs. [ABSTRACT FROM AUTHOR]

Multifunctional integrated device is an important research direction to realize high integration device. In this paper, the perovskite‐CdSe quantum dot bilayer structure device is fabricated, which can simultaneously realize luminescence and photoelectric detection functions under different voltage control. The device can apply to the reflective pulse oximeter system, which can further optimize the system structure while realizing reliable heart rate detection and arterial blood oxygenation detection. This work provides an effective solution to simplify the structure of pulse oximetry in the future. [ABSTRACT FROM AUTHOR]