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Seok, Sang Il
Laboratory for Energy Harvesting Materials and Systems (LEHMS)
Research Interests
  • Solar energy conversion, perovskite solar cells, inorganic-organic hybrid materials and processing, solution chemistry

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Relaxation of externally strained halide perovskite thin layers with neutral ligands

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Title
Relaxation of externally strained halide perovskite thin layers with neutral ligands
Author
Min, HanulJi, Sang-GeunSeok, Sang Il
Issue Date
2022-09
Publisher
CELL PRESS
Citation
JOULE, v.6, no.9, pp.2175 - 2185
Abstract
The preferred orientation (PO) and non-uniform strain of the perov-skite layer coated on the substrate can cause unwanted blue shifts in the band gap and several defects inside and on the grain bound-aries. Therefore, suppressing the anisotropic preferred growth of halide perovskite crystals while satisfying the trap passivation of grain boundaries is important to the fabrication of efficient and sta-ble perovskite solar cells (PSCs). In this study, the properties of spin-coated perovskite thin films were investigated by adding an appropriate amount of trioctylphosphine (TOP) as a neutral ligand to a formamidinium lead triiodide (FAPbI3) precursor solution. The TOP in the FAPbI3 precursor solution containing MACl significantly alleviated the PO by MACl and further induced a redshift of the band gap through the reduction of microstrain. Furthermore, TOP contributed to the passivation of defects via the surface termination of grain boundaries. PSCs based on these perovskite thin films ex-hibited an efficiency close to 25%.
URI
https://scholarworks.unist.ac.kr/handle/201301/60022
DOI
10.1016/j.joule.2022.06.031
ISSN
2542-4351
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