Imidazole additives in 2D halide perovskites: impacts of –CN versus –CH₃ substituents reveal the mediation of crystal growth by phase buffering

Abstract

The unique sandwiched structure and favorable crystallization kinetics have endowed two-dimensional (2D) halide perovskites with excellent ambient stability and facile film formation compared to their three-dimensional counterparts. However, the heterogeneous...

Highly Fluorescent Collagen-Based Quantum Dots as an Efficient Interlinkage in the 2D Perovskite Bulk for Improved Solar Cells

“…The radial integral intensity plot along the (110) diffraction ring (the q was around 10 nm –1 ) as a function of the azimuth angle of the five perovskite films is given in Figure e,f. ,, As shown in Figure S1, the perovskite films show a preferential orientation at azimuth angles of 90.5° for (110) planes (Figure e), demonstrating that the Col-QDs did not affect the preferential (111) orientation and crystallization of the perovskite layer . As shown in Figure S2, the smaller FWHM of the (111) orientation for the 2D perovskite film with 1 mg/mL Col-QD addition concentration indicates that the Col-QDs can improve the vertical stacking of the 2D perovskite arrays, which helps to enhance the transport of carries from the perovskite bulk to the electron transport layer (ETL) and hole transport layers (HTL). , …”

“…31 As shown in Figure S2, the smaller FWHM of the (111) orientation for the 2D perovskite film with 1 mg/mL Col-QD addition concentration indicates that the Col-QDs can improve the vertical stacking of the 2D perovskite arrays, which helps to enhance the transport of carries from the perovskite bulk to the electron transport layer (ETL) and hole transport layers (HTL). 41,42 The devices' corresponding J−V characteristics with the different additions are shown in Figure 5a. The best Col-QD addition concentration was 1 mg/mL.…”

Organic–Inorganic Hybrid Perovskite Materials for Ultrasonic Transducer in Medical Diagnosis

“…Antiferroelectric or ferroelectric materials have been always regarded as a promising candidate for electronic energy storage devices, owing to their natural double polarization versus electric field (P−E) hysteresis loops. Recently, the two-dimensional (2D) organic and inorganic hybrid perovskite materials, with structural diversity and tunability, have received a large number of attracted interests [18,25,26]. For example, Wu et al have reported a new type of 2D Ruddlesden−Popper (RP) hybrid perovskite antiferroelectric, ((CH 3 ) 2 CH 2 NH 3 )2CsPb 2 Br 7 showing an above-room-temperature Curie temperature at 353 K, and trigging by the synergistic dynamic motion of inorganic Cs atoms and organic isobutyl ammonium cations [18].…”

“…It is well-known that organic-inorganic hybrid perovskite materials exhibit excellent properties and ultra-high sensitivity in piezoelectric effect studies, and the preparation of materials does not require expensive equipment and processes. However, a series of problems in organic-inorganic hybrid perovskite materials, such as the humidity and thermal stability of the material [24][25][26], seriously restrict their industrialization development and application. Therefore, methods to obtain cheap and stable perovskite materials are of great significance for the widespread development of ultrasonic sensors in the future.…”

“…Since the first report by Miyasaka Research Group of Japan in 2009, the power conversion efficiency of perovskite solar cells has increased significantly from about 3% to more than 25% in less than one decade, stimulating fierce competition around the world [19][20][21][22]. Such perovskite materials have also produced great application prospects in the fields of phototransistors, detectors, laser generation and detection, imaging, hysteresis storage, and so on [16][17][18][19][20][21][22][23][24][25][26].…”