Investigation of Bismuth Triiodide (BiI3) for Photovoltaic Applications

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• 作者：Riley E. Brandt ; Rachel C. Kurchin ; Robert L. Z. Hoye ; Jeremy R. Poindexter ; Mark W. B. Wilson ; Soumitra Sulekar ; Frances Lenahan ; Patricia X. T. Yen ; Vladan Stevanovi膰 ; Juan C. Nino ; Moungi G. Bawendi ; Tonio Buonassisi
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2015
• 出版时间：November 5, 2015
• 年：2015
• 卷：6
• 期：21
• 页码：4297-4302
• 全文大小：448K
• ISSN：1948-7185

文摘

Guided by predictive discovery framework, we investigate bismuth triiodide (BiI₃) as a candidate thin-film photovoltaic (PV) absorber. BiI₃ was chosen for its optical properties and the potential for 鈥渄efect-tolerant鈥?charge transport properties, which we test experimentally by measuring optical absorption and recombination lifetimes. We synthesize phase-pure BiI₃ thin films by physical vapor transport and solution processing and single-crystals by an electrodynamic gradient vertical Bridgman method. The bandgap of these materials is 鈭?.8 eV, and they demonstrate room-temperature band-edge photoluminescence. We measure monoexponential recombination lifetimes in the range of 180鈥?40 ps for thin films, and longer, multiexponential dynamics for single crystals, with time constants up to 1.3 to 1.5 ns. We discuss the outstanding challenges to developing BiI₃ PVs, including mechanical and electrical properties, which can also inform future selection of candidate PV absorbers.