
- Journal of Semiconductors
- Vol. 43, Issue 4, 040203 (2022)
Abstract
Perovskites have been widely utilized as active materials in various optoelectronic devices, e.g. light-emitting diodes (LEDs), photodetectors (PDs), and solar cells (SCs), etc., due to their facile processability and outstanding optoelectronic properties, like high optical absorption coefficients (~105 cm−1), high carrier mobilities (~10–103 cm2/(V·s)), long carrier lifetime (~1–10 μs), long carrier diffusion length (1–100 μm) and tunable bandgaps (~1.17–2.88 eV), which enable them to deliver a comparable performance as traditional inorganic semiconductors. Perovskite LEDs offer 12.2%, 22.2%, 28.1% and 12.8% EQEs for white LEDs[
The memory and central processing unit in traditional computers based on von Neumann architecture are separated, and the mismatch between the processing speed and data transmission speed causes difficulty in solving fast processing and storage of enormous data in face of the digital revolution[
Figure 1.(Color online) (a) Schematic of the synapse device based on CsPbBr3 QDs. (b) Current modulation of CsPbBr3 QDs-based synaptic device under the train of photonic pulses and negative electrical pulses. (c) Schematic of the light-emitting memory device. (d) Dual functions of CsPbBr3 QDs-based device as both light-emitting electrochemical cell and resistive random-access memory by changing the bias direction. (e) High-resolution ultrasound imaging system based on fiber/perovskite device, where L, FC, MMF, SMF, FOH, DAQ represent lens, fiber coupler, multimode fiber, single-mode fiber, fiber-optic hydrophone and data acquisition card, respectively. (f) Ultrasonic imaging of fisheye based on fiber/perovskite device. (a) and (b), reproduced with permission[
In addition to using photoelectrically-controlled variable resistance of perovskites to develop synaptic devices, perovskites also find applications in communication. High-performance storage and communication devices with high throughput, low power consumption and fast response are desired to meet the requirements of information explosion in modern society. Chang et al. verified a difunctional device composed of Ag/CsPbBr3 QDs/ITO as both resistive random-access memory and light-emitting electrochemical cell by inverting the electrode (Fig. 1(c)), and then inversely connected two devices in series to achieve light-emitting memories, in which one as memory for coding and the other as light-emitting electrochemical cell for reading (Fig. 1(d))[
Apart from optoelectronic properties, the photoacoustic properties of perovskites have been applied in photoacoustic transducers, which can transfer light signals to ultrasound pulses, and are applied in biomedical imaging, nondestructive testing, etc.[
In short, perovskites find some new applications in computing[
Acknowledgements
L. Zhu thanks the financial support from Guangdong Basic and Applied Basic Research Foundation (2021A1515012198) and the Science and Technology Program of Guangzhou (202102021084). S. Lin thanks the support from Songshan Lake Materials Laboratory (Y0D1051F211) and the Key Project of the Joint Funds of Guangdong and Dongguan (2021B1515120034). L. Ding thanks the open research fund of Songshan Lake Materials Laboratory (2021SLABFK02), the National Key Research and Development Program of China (2017YFA0206600), and the National Natural Science Foundation of China (51773045, 21772030, 51922032, and 21961160720) for financial support.
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