Optoelectronic properties of facile synthesized orthorhombic cesium lead bromide (CsPbBr3)

Autor: Prasenjit Maji, Sachindranath Das, Priyabrata Sadhukhan
Rok vydání: 2020
Předmět:
Zdroj: Journal of Materials Science: Materials in Electronics. 31:17100-17109
ISSN: 1573-482X
0957-4522
DOI: 10.1007/s10854-020-04270-1
Popis: 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.
Databáze: OpenAIRE
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