All-inorganic perovskite quantum dot light-emitting memories

Abstract

Field-induced ionic motions in all-inorganic CsPbBr3 perovskite quantum dots (QDs) strongly dictate not only their electro-optical characteristics but also the ultimate optoelectronic device performance. Here, we show that the functionality of a single Ag/CsPbBr3/ITO device can be actively switched on a sub-millisecond scale from a resistive random-access memory (RRAM) to a light-emitting electrochemical cell (LEC), or vice versa, by simply modulating its bias polarity. We then realize for the first time a fast, all-perovskite light-emitting memory (LEM) operating at 5 kHz by pairing such two identical devices in series, in which one functions as an RRAM to electrically read the encoded data while the other simultaneously as an LEC for a parallel, non-contact optical reading. We further show that the digital status of the LEM can be perceived in real time from its emission color. Our work opens up a completely new horizon for more advanced all-inorganic perovskite optoelectronic technologies.

Tuning the Emission Wavelength of Lead Halide Perovskite NCs via Size and Shape Control

“…Perovskite NCs have excellent performance in their optoelectrical properties. 49 However, their real-world device applications are currently limited by their stability, and this issue must be resolved completely for the universal use of perovskite NC materials.…”

Current state-of-the-art characterization methods for probing defect passivation towards efficient perovskite solar cells

“…In high-resolution KPFM, CPD is greatly affected by the short distance force between the needle tip and sample. This can be dened by eqn (14):…”

“…Over the past few years, metal halide perovskites (MHPs) have succeeded as one of the new wonder materials not only for traditional areas of photovoltaics, 1 light-emitting diodes (LEDs), 2 photodetectors and photocatalysis, 3,4 but also for many novel potential applications, such as X-ray imaging sensors, 5,6 exible scanners, 7 photorechargeable ion batteries (IBs), 8,9 biomedical detectors [10][11][12] and information memory. [13][14][15] Metal halide perovskites with bulk 3D form have a general chemical formula of ABX 3 , where A is an organic or inorganic monovalent cation (typically methylammonium, formamidinium or cesium), B is a divalent metal ion (Sn 2+ , Ge 2+ , or Pb 2+ ), and X is a halide anion (Cl À , Br À , or I À ). Signicantly, the most impressive development has so far been achieved undoubtedly in perovskite-light absorber based solar cells (PSCs) with the certied power conversion efficiency (PCE) reaching 25.5%, 16 since being initially reported in 2009.…”

Hetero-perovskite engineering for stable and efficient perovskite solar cells

“…103 In particular, all-inorganic Cs-based halide perovskites have been widely applied in PSCs and LEDs. 112–114 For example, better environmental stability was reflected in 0D Cs 4 PbX 6 , 1D CsPb 2 X 5 and 3D CsPbX 3 (X = Cl, Br, or I), which benefits from the absence of organic cations. 115 However, all-inorganic perovskite derivatives show special properties in phase stability and phase transition compared with organic–inorganic counterparts, such as the α-CsPbI 3 phase with a cubic structure which can spontaneously transform into the non-perovskite δ-CsPbI 3 phase at RT due to phase instability.…”