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Tuning Bandgap of Mixed‐Halide Perovskite for Improved Photovoltaic Performance Under Monochromatic‐Light Illumination
Author(s) -
Zhang Xu,
Liu Jiang,
Song Zhen,
Zuo Wentao,
Fan Zhengfang,
He Xulin,
Luo Kun,
Ye Qinyan,
Liao Cheng
Publication year - 2019
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201800727
Subject(s) - monochromatic color , perovskite (structure) , materials science , optoelectronics , band gap , halide , energy conversion efficiency , visible spectrum , absorption (acoustics) , wavelength , absorption edge , thin film , optics , semiconductor , nanotechnology , chemistry , inorganic chemistry , physics , composite material , crystallography
Organic–inorganic halide perovskites have emerged as promising materials for optoelectronic devices. This paper focuses on a new application field for perovskite materials as monochromatic‐light conversion devices. First the optical properties of organic–inorganic perovskite semiconductors with bandgaps varying from near‐infrared to visible at room temperature are presented. Two types of hybrid organic–inorganic mixed‐halide perovskites, (FAPbI 3 ) x (MAPbBr 3 ) 1‐x and FA 0.85 MA 0.15 Pb(I x Br 1‐x ) 3 , are adopted for bandgap tuning, an approximate linear variation of bandgaps with the x value is obtained. The relationship between thin film composition and device performance are investigated. Based on the results of the above bandgap tuning, two kinds of devices with bandgap near the wavelength of 683 nm are characterized under monochromatic‐light illumination. A conversion efficiency of up to 40% under 60 mW cm −2 monochromatic‐light illumination is achieved. The results confirm that the perovskite films exhibit sharp optical absorption edge, enabling highly efficient monochromatic‐light conversion device.