Optoelectronic properties of facile synthesized orthorhombic cesium lead bromide (CsPbBr 3 )
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Optoelectronic properties of facile synthesized orthorhombic cesium lead bromide (CsPbBr3) Prasenjit Maji1, Priyabrata Sadhukhan1, and Sachindranath Das1,* 1
Department of Instrumentation Science, Jadavpur University, Jadavpur, Kolkata 700032, India
Received: 16 May 2020
ABSTRACT
Accepted: 17 August 2020
CsPbBr3 has been synthesized via a wet chemical technique instead of colloidal hot injection route. Crystalline structure and chemical composition of the material have been assured by Rietveld refinement and energy dispersive X-ray spectroscopy. Photoresponse capability of CsPbBr3 nanocrystal in cubic phase has been already explored. Here, intrinsic optoelectronic properties of orthorhombic CsPbBr3 have been investigated in detail. A prototype photodetector has been fabricated on a transparent conducting oxide-coated glass by using silver as the other electrode material. The photo-responsibility of CsPbBr3 arises due to the combined effect of electron–hole pair generation and trapping within material and recombination. The non-linearity of I–V characteristics clearly reveals the formation of well-established Schottky contact at perovskite– ITO junction. Responsivity of the detector increases from 1.4 to 1.73 mA W−1 after enhancing the irradiance from 25 to 100 mW cm−2 at 8 V bias voltages. Linear dynamic range has been accounted to study the linear photosensitivity of the device. In order to investigate the stability and reversibility, photocurrent has been measured under ON/OFF condition of frequency 20 s. The quantitative contribution of polycrystalline grain and grain boundary to charge mobilization has been evaluated by fitting the Cole–Cole plot under different solar intensities.
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1 Introduction Organic–inorganic hybrid perovskite materials have drawn great attention of the researchers due to its enormous scope in new-generation energy conversion device [1–4]. Nowadays, perovskite solar cell becomes more challenging to silicon-based solar cell for its tremendous growth in efficiency within the last few years. In that scenario, inorganic halide
perovskites (CsPbX3, X=Cl, Br, and I) came into focus due to its excellent optical properties, superior optoelectronic and electrical properties, as well as good stability compared to organic–inorganic hybrid perovskites [5–9]. They have been explored in potential applications, e.g., water splitting, supercapacitor, and photodetector [10, 11]. Lee et al. fabricated CsPbI3based photodetector which exhibited a good ON/ OFF photocurrent ratio of 105 [12]. Stoumpos
Address correspondence to E-mail: [email protected]; [email protected]
https://doi.org/10.1007/s10854-020-04270-1
J Mater Sci: Mater Electron
reported that CsPbBr3 meets most of the requirements for successful detection of high-energy radiation such as high attenuation and superior photoconductivity response with significant detector resolution [13]. Moreover, CsPbBr3 becomes a more promising candidate that ha
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