Journal
RSC ADVANCES
Volume 8, Issue 45, Pages 25802-25807Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ra04422h
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Funding
- 1000 Young Talents Program of China
- Natural Science Foundation of China [21701118]
- Natural Science Foundation of Jiangsu Province [K20161209, BK20160323]
- Key Technology Initiative of Suzhou Municipal Science and Technology Bureau [SYG201748]
- Suzhou Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies, Suzhou, China
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Inorganic defect halide compounds such as Cs3Bi2I9 have been regarded as promising alternatives to overcome the instability and toxicity issues of conventional perovskite solar cells. However, their wide indirect bandgaps and deep defect states severely limit their photoelectronic conversion efficiency when implemented in devices. Trivalent cation substitution has been proposed by previous calculations allowing the engineering of their band structures, but experimental evidences are still lacking. Herein we use the trivalent cation Ru3+ to partially replace Bi3+ in Cs3Bi2I9, and reveal their structural and optoelectronic properties, as well as the environmental stability. The Ru-doped Cs3Bi2I9 shows a decreasing bandgap with the increasing doping levels and an overall up-shift of band structure, owing to the dopant-induced defect states and thus enhanced phonon-electron coupling. As a result, upon Ru3+ doping, the narrowed bandgap and the upward shift of the band structures might facilitate and broaden their applications in optoelectronic devices.
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