All-inorganic cesium lead halide perovskite nanocrystals for photodetector applications

Abstract

Herein, we describe simple, fast and reproducible halide ion exchange reactions in CsPbX3 (X = Cl, Br, I) nanocrystals (NCs) at room temperature. Through the simple adjustment of the halide ion concentration, the photoluminescence of these NCs can be tuned over the entire visible region (425-655 nm). Photodetector devices based on entirely inorganic CsPbI3 NCs are demonstrated for the first time. The photodetectors exhibited a good on/off photocurrent ratio of 10(5).

Solution-processed semiconductors for next-generation photodetectors

“…96 From a materials perspective, exciting directions are open by the use of recently reported material platforms. Novel hybrid materials such as quantum-dot-in-perovskite solids 97 -that epitaxially incorporate CQDs in a perovskite matrix-2D and quasi-2D perovskites 98 -that exhibit tunable bandgaps and anisotropic mobilities-or perovskite-based nanocrystals, 99 might open the door for new unconventional photodetection schemes stemming for their particular material properties; or allow efficiently revisiting more traditional approaches employed for crystalline semiconductors such as avalanche 100 or quantum well photodetectors. 21,101 The realization of efficient all-solution-processed photodetectors is also an attractive route to be explored towards flexible and wearable photodetection.…”

Polymer-Enhanced Stability of Inorganic Perovskite Nanocrystals and Their Application in Color Conversion LEDs

“…[1][2][3][4] Of high interest are their remarkable optical properties such as non-linear absorption, stimulated emission and blinking behavior. 2,[5][6][7] Compared to classical Cd-based chalcogenide quantum dots (QDs), CsPbX 3 (X = Cl, Br, I) offer a very broad and easily adjustable composition versatility together with ample options for shape control, which allow tuning of their emission wavelength throughout the whole visible spectrum.…”

“…[8][9][10][11][12][13][14] Among other applications, such highly luminescent and spectrally tunable NCs are ideally suited to produce monochromatic and white LEDs (WLEDs). 15 In this regard, CsPbX 3 NCs have been utilized as the emissive layer in electroluminescent monochromatic and color conversion QD-LEDs showing exceptionally narrow emission bandwidths and thus high color quality in devices. [16][17][18][19][20] However, while CsPbX 3 (X = Br, I) perovskite NCs can be stored in solution, maintaining their luminescence for several months, they suffer from humidity, light and temperature driven degradation in operation conditions and from a low colloidal stability with a related limited processability.…”

Cesium lead halide ( CsPbX 3, X = Cl , Br, I) perovskite quantum dots-synthesis, properties, and applications: a review of their present status

“…Ramasamy et al 79 used this facile exchange method at room temperature using halides of lithium salts (i.e., LiI and LiCl) for the exchange/reverse exchange of CsPbBr 3 nanoparticles into CsPbCl 3 and CsPbI 3 nanoparticles and the authors achieved this exchange process within some seconds. Also, there was no change in the morphology structure with variation in the thickness of the exchanged products (CsPbI 3 NCs was thicker whereas CsPbCl 3 NCs was thinner than CsPbBr 3 NCs).…”

“…72 Likewise, the origin of the PL in Cs-LHQDs was attributed to the direct bandgap transition (or) excitonic recombination. 79,54 The intensity of the PL spectrum depends on the reaction temperature, cleaning and separation conditions, and so on. 76 Moreover, the size and position of PL spectra were found to be red shifted when the synthesis temperature was increased and blue shifted when the temperature was decreased.…”