Strong Depletion in Hybrid Perovskite p-n Junctions Induced by Local Electronic Doping

Advanced Materials
Qingdong OuQiaoliang Bao

Abstract

A semiconductor p-n junction typically has a doping-induced carrier depletion region, where the doping level positively correlates with the built-in potential and negatively correlates with the depletion layer width. In conventional bulk and atomically thin junctions, this correlation challenges the synergy of the internal field and its spatial extent in carrier generation/transport. Organic-inorganic hybrid perovskites, a class of crystalline ionic semiconductors, are promising alternatives because of their direct badgap, long diffusion length, and large dielectric constant. Here, strong depletion in a lateral p-n junction induced by local electronic doping at the surface of individual CH3 NH3 PbI3 perovskite nanosheets is reported. Unlike conventional surface doping with a weak van der Waals adsorption, covalent bonding and hydrogen bonding between a MoO3 dopant and the perovskite are theoretically predicted and experimentally verified. The strong hybridization-induced electronic coupling leads to an enhanced built-in electric field. The large electric permittivity arising from the ionic polarizability further contributes to the formation of an unusually broad depletion region up to 10 µm in the junction. Under visible optica...Continue Reading

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Citations

Jun 29, 2018·Small·Xiang QiQiaoliang Bao
Nov 22, 2019·Nanotechnology·Jingying LiuQiaoliang Bao
May 29, 2020·Nature Communications·Yingjie WuQiaoliang Bao
Jun 7, 2019·Advanced Materials·Jingying LiuQiaoliang Bao
Jan 14, 2021·Global Challenges·Shendong ZhuangHan Zhang
Mar 5, 2021·Nature Communications·Hong ChenJianpu Wang
Jun 12, 2021·Nature Materials·Antonio Gaetano RicciardulliMichael Saliba
Jun 18, 2021·ACS Nano·Amrita DeyLakshminarayana Polavarapu
May 30, 2021·Advanced Materials·Jianwei BenXiaojuan Sun
Nov 27, 2019·The Journal of Physical Chemistry Letters·Xinyi LiuWei Liu
Mar 2, 2019·Chemical Reviews·Philip SchulzAntoine Kahn
Aug 30, 2019·ACS Applied Materials & Interfaces·Chan-Woo JeonIl-Kyu Park
May 11, 2018·The Journal of Physical Chemistry Letters·Benedikt DänekampHenk J Bolink
Jun 8, 2018·ACS Applied Materials & Interfaces·Ziyu WangQiaoliang Bao
Oct 1, 2019··Qingdong OuDragomir N. Neshev

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