Investigation of Ion-Mediated Charge Transport in Methylammonium Lead Iodide Perovskite

被引：21
作者：
Dhar, Joydeep [1 ]
Sil, Sayantan [1 ]
Dey, Arka [1 ]
Sanyal, Dirtha [2 ]
Ray, Partha Pratim [1 ]
机构：
[1] Jadavpur Univ, Dept Phys, Kolkata 700032, India
[2] Ctr Variable Energy Cyclotron, 1-AF Bidhannagar, Kolkata 700064, India
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2017年 / 121卷 / 10期
关键词：
ORGANOMETAL TRIHALIDE PEROVSKITE; DC POLARIZATION TECHNIQUE; P-TYPE; HYSTERESIS; CONDUCTIVITY; MIGRATION; STABILITY;
D O I：
10.1021/acs.jpcc.7b01047
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We have investigated the origin of ionic conductivity in methylammonium lead iodide (MAPbI(3)) by positron annihilation lifetime spectroscopy (PALS), supplemented by coincidence Doppler broadening spectroscopic (CDBS) techniques which reveal the presence of methylammonium (MA(+)) defects in the perovskite crystal lattice. Crystallinity and the defect concentration vary with the perovskite synthesis process, which in turn governs the magnitude of ionic conductivity. Single-crystalline perovskite contains lesser defects with equal probability of developing both cationic and anionic (halide) vacancies, whereas the polycrystalline perovskite sample developed through mechanical process carries mainly cationic, i.e., MA(+) vacancy (V'(MA)) in its crystal lattice as indicated by direct current (dc) polarization experiment.
引用
收藏
页码：5515 / 5522
页数：8
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