Research output: Contribution to journal › Article › peer-review
We present a structural and optoelectronic study of 1D piperidinium, pyridinium, and 3-hydroxypyridinium lead trihalides. In contrast to the piperidinium and pyridinium species whose single inorganic chains [PbX 3 1-] n are separated by organic cations, the 3-hydroxypyridinium compound is characterized by double inorganic chains. According to DFT the valence and conduction bands of the piperidinium lead trihalides are composed of occupied p-orbitals of the halogen anions and unoccupied p-orbitals of the Pb 2+ cations. In contrast, the pyridinium species feature low-lying cationic energy levels formed from the cation's π∗-orbitals. Thus, electronic transitions between the cationic energy levels and valence bands require less energy than valence to conduction band transitions in the case of piperidinium lead trihalides. The presence of an OH group in the pyridinium ring leads to a bathochromic shift of the cationic energy levels resulting in a decreased energy of transitions from the cationic energy levels to the valence band. Electronic transitions predicted by DFT are observable in experimental optical absorption and luminescence spectra. This study paves the way for creation of 1D perovskite-like structures with desired optoelectronic properties.
Original language | English |
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Pages (from-to) | 4390-4403 |
Number of pages | 14 |
Journal | Dalton Transactions |
Volume | 49 |
Issue number | 14 |
Early online date | 9 Mar 2020 |
DOIs | |
State | Published - 14 Apr 2020 |
ID: 53481735