Journal
ACS APPLIED ENERGY MATERIALS
Volume 2, Issue 1, Pages 477-485Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.8b01507
Keywords
organic inorganic hybrid materials; perovskites; polyiodide; solar cells; dimensionality; iodine
Funding
- Swedish Foundation for Strategic Research (SSF) [FID15-0023]
- AForsk foundation [17-594]
- Swedish Research Council
- Swedish Foundation for Strategic Research (SSF) [FID15-0023] Funding Source: Swedish Foundation for Strategic Research (SSF)
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Two new organic inorganic hybrid perovskite compounds, (Me3S)(2)Pb5I14*2I(2) (1) and (C8H11S)(2)Pb2I6*I-2 (2), have been synthesized and subsequently characterized in this study. The materials were synthesized from facile one-pot, one-step reactions of lead iodide, corresponding sulfide, methanol, iodine, and hydroiodic acid in the case of 2. Structural analysis reveals the presence of polyiodide entities in both compounds. Compound 1 contains triiodide anions, I-3(-), that are uniquely shared between the 2D inorganic slabs, forming a 3D network. Both 1 and 2 have I-2 molecules that are bridging the inorganic slabs through a structural motif that can be regarded as a tetraiodide anion, I-4(2-). Optical spectroscopy shows band gaps of 1.86 eV for 1 and 1.89 eV for 2. The optoelectronic properties were further investigated with band structure calculations. Single-crystal IV-characteristics of 1 show that the compound is photoactive confirming it as a promising photovoltaic candidate. Compound 1 highlights a novel strategy of designing 3D semiconducting hybrid materials by incorporating polyiodides to provide direct geometric and electronic connections between the semiconducting inorganic perovskite sheets.
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