%0 Journal Article %1 hu2019synthetic %A Hu, Jun %A Oswald, Iain W. H. %A Stuard, Samuel J. %A Nahid, Masrur Morshed %A Zhou, Ninghao %A Williams, Olivia F. %A Guo, Zhenkun %A Yan, Liang %A Hu, Huamin %A Chen, Zheng %A Xiao, Xun %A Lin, Yun %A Yang, Zhibin %A Huang, Jinsong %A Moran, Andrew M. %A Ade, Harald %A Neilson, James R. %A You, Wei %D 2019 %J Nature Communications %K control degeneracy orientational spacer synthetic %N 1 %P 1276-- %R 10.1038/s41467-019-08980-x %T Synthetic control over orientational degeneracy of spacer cations enhances solar cell efficiency in two-dimensional perovskites %U https://doi.org/10.1038/s41467-019-08980-x %V 10 %X Two-dimensional perovskites have emerged as more intrinsically stable materials for solar cells. Chemical tuning of spacer organic cations has attracted great interest due to their additional functionalities. However, how the chemical nature of the organic cations affects the properties of two-dimensional perovskites and devices is rarely reported. Here we demonstrate that the selection of spacer cations (i.e., selective fluorination of phenethylammonium) affects the film properties of two-dimensional perovskites, leading to different device performance of two-dimensional perovskite solar cells (average n = 4). Structural analysis reveals that different packing arrangements and orientational disorder of the spacer cations result in orientational degeneracy and different formation energies, largely explaining the difference in film properties. This work provides key missing information on how spacer cations exert influence on desirable electronic properties and device performance of two-dimensional perovskites via the weak and cooperative interactions of these cations in the crystal lattice.

@article{hu2019synthetic, abstract = {Two-dimensional perovskites have emerged as more intrinsically stable materials for solar cells. Chemical tuning of spacer organic cations has attracted great interest due to their additional functionalities. However, how the chemical nature of the organic cations affects the properties of two-dimensional perovskites and devices is rarely reported. Here we demonstrate that the selection of spacer cations (i.e., selective fluorination of phenethylammonium) affects the film properties of two-dimensional perovskites, leading to different device performance of two-dimensional perovskite solar cells (average n = 4). Structural analysis reveals that different packing arrangements and orientational disorder of the spacer cations result in orientational degeneracy and different formation energies, largely explaining the difference in film properties. This work provides key missing information on how spacer cations exert influence on desirable electronic properties and device performance of two-dimensional perovskites via the weak and cooperative interactions of these cations in the crystal lattice.}, added-at = {2019-03-21T09:49:51.000+0100}, author = {Hu, Jun and Oswald, Iain W. H. and Stuard, Samuel J. and Nahid, Masrur Morshed and Zhou, Ninghao and Williams, Olivia F. and Guo, Zhenkun and Yan, Liang and Hu, Huamin and Chen, Zheng and Xiao, Xun and Lin, Yun and Yang, Zhibin and Huang, Jinsong and Moran, Andrew M. and Ade, Harald and Neilson, James R. and You, Wei}, biburl = {https://www.bibsonomy.org/bibtex/2fbe3b9c56226918218ee03f5193c9318/sere}, doi = {10.1038/s41467-019-08980-x}, interhash = {0fac35f2db057e31a2fafe2ad90d64c4}, intrahash = {fbe3b9c56226918218ee03f5193c9318}, issn = {20411723}, journal = {Nature Communications}, keywords = {control degeneracy orientational spacer synthetic}, number = 1, pages = {1276--}, refid = {Hu2019}, timestamp = {2019-03-21T09:49:51.000+0100}, title = {Synthetic control over orientational degeneracy of spacer cations enhances solar cell efficiency in two-dimensional perovskites}, url = {https://doi.org/10.1038/s41467-019-08980-x}, volume = 10, year = 2019 }