“Breathing” organic cation to stabilize multiple structures in low-dimensional Ge-, Sn-, and Pb-based hybrid iodide perovskites

Chen，Congcong1; Morgan，Emily E.2; Liu，Yang1; Chen，Jian1; Seshadri，Ram2; Mao，Lingling1

2022

10.1039/d2qi01247b

Inorganic Chemistry Frontiers   Impact Factor & Quartile

2052-1553

Low-dimensional hybrid inorganic-organic perovskites are excellent candidates for stable optoelectronic devices. The dimensionality of these perovskites depends largely on the organic and inorganic compositions, as well as the synthetic conditions. Here, we report five new hybrid iodides, (ETU)GeI, (ETU)GeI, (ETU)SnI, (ETU)PbI, and (ETU)PbI using only one type of organic cation, namely, S-(2-aminoethyl)isothiouronium (ETU). (ETU)GeI and (ETU)SnI belong to the (110)-oriented structure-type with “3 × 3” sawtooth corrugated layers and crystallize in a structure with the orthorhombic space group Pbca. (ETU)GeI crystallizes in a structure with the triclinic space group P1̄, featuring a 2D layered structure with combinations of corner, edge, and face-sharing [GeI] octahedra. For the Pb-based series, (ETU)PbI has the conventional (100) - oriented 2D type whereas (ETU)PbI has a unique 0D structure. Remarkably, the unstable 2D orange-phase (ETU)PbI transforms to a stable 0D yellow phase (ETU)PbI, accompanied by the reduction of the C-S-C angle of the organic cation ETU. The optical band gaps are largely regulated by the diverse types of structure and are in the range of 1.8 eV to 2.8 eV. (ETU)SnI is the only material showing notable photoluminescence at room-temperature. Our work showcases the flexibility of the organic cation in determining the structural dimensionality and provides a new strategy in generating new hybrid materials.

SCI ; EI

English

First ; Corresponding

WOS:000839580500001

20223412622144

Energy gap ; Germanium compounds ; Hybrid materials ; Optoelectronic devices ; Perovskite ; Positive ions ; Tin compounds

Minerals:482.2 ; Optical Devices and Systems:741.3

2-s2.0-85136298265

Scopus

1.Department of Chemistry,Southern University of Science and Technology Shenzhen,Guangdong,518055,China
2.Materials Research Laboratory and Materials Department,University of California,Santa Barbara,93106,United States

Chen，Congcong,Morgan，Emily E.,Liu，Yang,等. “Breathing” organic cation to stabilize multiple structures in low-dimensional Ge-, Sn-, and Pb-based hybrid iodide perovskites[J]. Inorganic Chemistry Frontiers,2022.

Chen，Congcong,Morgan，Emily E.,Liu，Yang,Chen，Jian,Seshadri，Ram,&Mao，Lingling.(2022).“Breathing” organic cation to stabilize multiple structures in low-dimensional Ge-, Sn-, and Pb-based hybrid iodide perovskites.Inorganic Chemistry Frontiers.

Chen，Congcong,et al."“Breathing” organic cation to stabilize multiple structures in low-dimensional Ge-, Sn-, and Pb-based hybrid iodide perovskites".Inorganic Chemistry Frontiers (2022).