期刊
ACS APPLIED ENERGY MATERIALS
卷 2, 期 1, 页码 539-547出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.8b01572
关键词
lead-free perovskite; solar cells; single crystal; structural characterization; antimony perovskites; photoluminescence; thin film
资金
- Austrian Climate and Energy Fund within the program Energy Emission Austria [(848 929)]
Rubidium antimony halides are a promising low toxic alternative to organo-lead halide perovskites as photovoltaic material. In this contribution, we systematically investigate the influence of varying the bromide to iodide ratio on the structural, optical, and photovoltaic properties of Rb3Sb2Br9-xIx (x = 0-9). Single crystal data reveal that all compounds crystallize in a 2D-layered monoclinic crystal structure. Sequential substitution of iodide with the smaller bromide does not change the crystal system; however, increasing the bromide content results in a shrinkage of the unit cell as well as in a blue shift of the absorption onset, increasing the band gap from 2.02 to 2.46 eV. Whereas the photovoltaic properties of bromide rich compounds are limited due to a preferential orientation of the layered structure parallel to the substrate, which is detrimental to harge transport, solar cells with Rb3Sb2I9 as absorber material display power conversion efficiencies of 1.37%. Moreover, the devices exhibit low hysteresis properties and are stable for more than 150 days stored under inert atmosphere.
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