%0 Journal Article %1 lee2018perovskite %A Lee, Jin-Wook %A Dai, Zhenghong %A Han, Tae-Hee %A Choi, Chungseok %A Chang, Sheng-Yung %A Lee, Sung-Joon %A De Marco, Nicholas %A Zhao, Hongxiang %A Sun, Pengyu %A Huang, Yu %A Yang, Yang %D 2018 %J Nature Communications %K 2D/3D_heterostructure high_JSC high_PCE perovskite stability %N 1 %P 3021-- %R 10.1038/s41467-018-05454-4 %T 2D perovskite stabilized phase-pure formamidinium perovskite solar cells %U https://doi.org/10.1038/s41467-018-05454-4 %V 9 %X Compositional engineering has been used to overcome difficulties in fabricating high-quality phase-pure formamidinium perovskite films together with its ambient instability. However, this comes alongside an undesirable increase in bandgap that sacrifices the device photocurrent. Here we report the fabrication of phase-pure formamidinium-lead tri-iodide perovskite films with excellent optoelectronic quality and stability. Incorporation of 1.67 mol% of 2D phenylethylammonium lead iodide into the precursor solution enables the formation of phase-pure formamidinium perovskite with an order of magnitude enhanced photoluminescence lifetime. The 2D perovskite spontaneously forms at grain boundaries to protect the formamidinium perovskite from moisture and suppress ion migration. A stabilized power conversion efficiency (PCE) of 20.64% (certified stabilized PCE of 19.77%) is achieved with a short-circuit current density exceeding 24 mA cm−2 and an open-circuit voltage of 1.130 V, corresponding to a loss-in-potential of 0.35 V, and significantly enhanced operational stability.

@article{lee2018perovskite, abstract = {Compositional engineering has been used to overcome difficulties in fabricating high-quality phase-pure formamidinium perovskite films together with its ambient instability. However, this comes alongside an undesirable increase in bandgap that sacrifices the device photocurrent. Here we report the fabrication of phase-pure formamidinium-lead tri-iodide perovskite films with excellent optoelectronic quality and stability. Incorporation of 1.67 mol% of 2D phenylethylammonium lead iodide into the precursor solution enables the formation of phase-pure formamidinium perovskite with an order of magnitude enhanced photoluminescence lifetime. The 2D perovskite spontaneously forms at grain boundaries to protect the formamidinium perovskite from moisture and suppress ion migration. A stabilized power conversion efficiency (PCE) of 20.64% (certified stabilized PCE of 19.77%) is achieved with a short-circuit current density exceeding 24 mA cm−2 and an open-circuit voltage of 1.130 V, corresponding to a loss-in-potential of 0.35 V, and significantly enhanced operational stability.}, added-at = {2018-08-14T11:45:29.000+0200}, author = {Lee, Jin-Wook and Dai, Zhenghong and Han, Tae-Hee and Choi, Chungseok and Chang, Sheng-Yung and Lee, Sung-Joon and De Marco, Nicholas and Zhao, Hongxiang and Sun, Pengyu and Huang, Yu and Yang, Yang}, biburl = {https://www.bibsonomy.org/bibtex/22c6c87a78644220939fa603003875726/bretschneider_m}, doi = {10.1038/s41467-018-05454-4}, interhash = {a101e0c426a1b9c6d7fdeace3ecff954}, intrahash = {2c6c87a78644220939fa603003875726}, issn = {20411723}, journal = {Nature Communications}, keywords = {2D/3D_heterostructure high_JSC high_PCE perovskite stability}, number = 1, pages = {3021--}, refid = {Lee2018}, timestamp = {2018-08-14T11:45:29.000+0200}, title = {2D perovskite stabilized phase-pure formamidinium perovskite solar cells}, url = {https://doi.org/10.1038/s41467-018-05454-4}, volume = 9, year = 2018 }