%0 Journal Article %1 doi:10.1021/acs.nanolett.7b00031 %A Sarmah, Smritakshi P. %A Burlakov, Victor M. %A Yengel, Emre %A Murali, Banavoth %A Alarousu, Erkki %A El-Zohry, Ahmed M. %A Yang, Chen %A Alias, Mohd S. %A Zhumekenov, Ayan A. %A Saidaminov, Makhsud I. %A Cho, Namchul %A Wehbe, Nimer %A Mitra, Somak %A Ajia, Idris %A Dey, Sukumar %A Mansour, Ahmed E. %A Abdelsamie, Maged %A Amassian, Aram %A Roqan, Iman S. %A Ooi, Boon S. %A Goriely, Alain %A Bakr, Osman M. %A Mohammed, Omar F. %D 0 %J Nano Letters %K charged double layers perovskite surface %N 0 %P null %R 10.1021/acs.nanolett.7b00031 %T Double Charged Surface Layers in Lead Halide Perovskite Crystals %U http://dx.doi.org/10.1021/acs.nanolett.7b00031 %V 0 %X Understanding defect chemistry, particularly ion migration, and its significant effect on the surface’s optical and electronic properties is one of the major challenges impeding the development of hybrid perovskite-based devices. Here, using both experimental and theoretical approaches, we demonstrated that the surface layers of the perovskite crystals may acquire a high concentration of positively charged vacancies with the complementary negatively charged halide ions pushed to the surface. This charge separation near the surface generates an electric field that can induce an increase of optical band gap in the surface layers relative to the bulk. We found that the charge separation, electric field, and the amplitude of shift in the bandgap strongly depend on the halides and organic moieties of perovskite crystals. Our findings reveal the peculiarity of surface effects that are currently limiting the applications of perovskite crystals and more importantly explain their origins, thus enabling viable surface passivation strategies to remediate them.

@article{doi:10.1021/acs.nanolett.7b00031, abstract = { Understanding defect chemistry, particularly ion migration, and its significant effect on the surface’s optical and electronic properties is one of the major challenges impeding the development of hybrid perovskite-based devices. Here, using both experimental and theoretical approaches, we demonstrated that the surface layers of the perovskite crystals may acquire a high concentration of positively charged vacancies with the complementary negatively charged halide ions pushed to the surface. This charge separation near the surface generates an electric field that can induce an increase of optical band gap in the surface layers relative to the bulk. We found that the charge separation, electric field, and the amplitude of shift in the bandgap strongly depend on the halides and organic moieties of perovskite crystals. Our findings reveal the peculiarity of surface effects that are currently limiting the applications of perovskite crystals and more importantly explain their origins, thus enabling viable surface passivation strategies to remediate them. }, added-at = {2017-02-23T17:13:50.000+0100}, author = {Sarmah, Smritakshi P. and Burlakov, Victor M. and Yengel, Emre and Murali, Banavoth and Alarousu, Erkki and El-Zohry, Ahmed M. and Yang, Chen and Alias, Mohd S. and Zhumekenov, Ayan A. and Saidaminov, Makhsud I. and Cho, Namchul and Wehbe, Nimer and Mitra, Somak and Ajia, Idris and Dey, Sukumar and Mansour, Ahmed E. and Abdelsamie, Maged and Amassian, Aram and Roqan, Iman S. and Ooi, Boon S. and Goriely, Alain and Bakr, Osman M. and Mohammed, Omar F.}, biburl = {https://www.bibsonomy.org/bibtex/263f5060e3860cc304b2d4437d18a0eb7/sere}, description = {Double Charged Surface Layers in Lead Halide Perovskite Crystals - Nano Letters (ACS Publications)}, doi = {10.1021/acs.nanolett.7b00031}, eprint = {http://dx.doi.org/10.1021/acs.nanolett.7b00031}, interhash = {44aed26ade0fed5dfa196c4e2ec257e1}, intrahash = {63f5060e3860cc304b2d4437d18a0eb7}, journal = {Nano Letters}, keywords = {charged double layers perovskite surface}, note = {PMID: 28145714}, number = 0, pages = {null}, timestamp = {2017-02-23T17:13:50.000+0100}, title = {Double Charged Surface Layers in Lead Halide Perovskite Crystals}, url = {http://dx.doi.org/10.1021/acs.nanolett.7b00031}, volume = 0, year = 0 }