Nevertheless, the inherent high trap density existed around the grain boundaries of PCF is ineluctable, [14][15][16] which restricts unobstructed carrier transport and boosts carrier recombination probability. Therefore, the performance enhancement of perovskite PCF has reached a bottleneck.Owing to its conspicuous crystallinity, high mobility, and low trap density, perovskite SCF within dozens of micrometers, is more attractive as light absorber for PDs than perovskite PCF. [17,18] Meanwhile, the larger area of perovskite crystal means a larger light receiving area. This makes large-area perovskite crystals are well received in the field of solar cells, integrated circuits, and light sensor arrays. [19][20][21] Unfortunately, due to the lack of immature technology for growing largesize thin SCF, reports about perovskite SCF PDs with ultra-fast response and high sensitivity remain scarce. Besides, the rotation hysteresis of organic components (FA, MA, etc) under an electric field and their instabilities against humidity and oxygen hinder the application of hybrid perovskite PDs with ultra-fast response. Fully inorganic cesium halide perovskites CsPbBr 3 (X = Br, I) demonstrate better stability and optoelectronic performances, and are therefore expected to obtain high stability and ultra-fast response optical communication devices. [22][23][24][25][26][27] Herein, we firstly report the growth of centimeter scale CsPbBr 3 SCFs with high quality and controllable thickness (40 µm) by an improved space-limited inverse temperature crystallization (ISLITC) procedure, in which the crystal growth process is controlled through variable heat areas. The MSM high-performance PD based on CsPbBr 3 SCF shows a fast response speed (500 kHz). Moreover, the use of our PD in an optical communication system is finally demonstrated. Results and DiscussionFigure 1a briefly shows the alterable heating area growth method of CsPbBr 3 SCF. Once stable nuclei are formed in a small heating region, the heating area is enlarged from 0.01 to 13 cm 2 to reduce the wafer growth rate and thus obtain high-quality and large-size wafers. To obtain large thin singleThe photodetector (PD) is the key component to realize efficient optoelectronic conversion signal in the visible light communication (VLC) system. The response speed directly determines the bandwidth of the whole system. Metal halide perovskite is a neotype of low-cost solution processing semiconductor, with strong optical absorption, low trap density, and high carrier mobility, thus has been widely explored in photoelectric detection applications. However, previously reported perovskite polycrystalline photodetectors exhibit limited response speed due to the existence of grain boundaries.Here, an improved confined space method is developed through adjusting the heating area to control nucleation, resulting in centimeter scale fully inorganic perovskite CsPbBr 3 thin single crystal films (SCFs) (<40 µm). The smooth surface and high crystallinity of CsPbBr 3 SCFs render admirable exciton lif...

Large-scale, high-quality MAPbBr3 SCFs with high carrier lifetime and carrier mobility are grown by the altering heating area assisted space confined method.

Perovskite nanomaterials have been highly thought as next-generation light emitters after recent development, owing to their benefits of simple synthesis, low-cost, large-area, and wide color gamut. Encouragingly, the external quantum...

Correction for ‘Altering heating area assisted space confined method for growth of large scale and high quality MAPbBr3 single crystal thin films’ by Changqian Li et al., J. Mater. Chem. C, 2022, DOI: https://doi.org/10.1039/d2tc02301f.

Cesium lead-halide perovskite nanocrystals (NCs) have emerged as a great potential for next-generation light-emitting diodes (LED) applications due to their high color purity, tunable optical bandgaps, and controllable synthesis. However,...