Kinetics of Ion Transport in Perovskite Active Layers and Its Implications for Active Layer Stability

被引:400
作者
Bag, Monojit [1 ]
Renna, Lawrence A. [1 ]
Adhikari, Ramesh Y. [2 ]
Karak, Supravat [1 ]
Liu, Feng [3 ]
Lahti, Paul M. [1 ]
Russell, Thomas P. [3 ,4 ]
Tuominen, Mark T. [2 ]
Venkataraman, D. [1 ]
机构
[1] Univ Massachusetts, Dept Chem, Amherst, MA 01003 USA
[2] Univ Massachusetts, Dept Phys, Amherst, MA 01003 USA
[3] Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA
[4] Univ Massachusetts, Dept Polymer Sci & Engn, Amherst, MA 01003 USA
关键词
ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; SOLAR-CELLS; LEAD-IODIDE; MIXED CONDUCTORS; HOLE-CONDUCTOR; DIFFUSION; HYSTERESIS; STATE; PERFORMANCE; EFFICIENCY;
D O I
10.1021/jacs.5b08535
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Solar cells fabricated using alkyl ammonium metal halides as light absorbers have the right combination of high power conversion efficiency and ease of fabrication to realize inexpensive but efficient thin film solar cells. However, they degrade under prolonged exposure to sunlight. Herein, we show that this degradation is quasi-reversible, and that it can be greatly lessened by simple modifications of the solar cell operating conditions. We studied perovskite devices using electrochemical impedance spectroscopy (EIS) with methylammonium (MA)-, formamidinium (FA)-, and MA(x)FA(1-x) lead triiodide as active layers. From variable temperature EIS studies, we found that the diffusion coefficient using MA ions was greater than when using FA ions. Structural studies using powder X-ray diffraction (PXRD) show that for MAPbI(3) a structural change and lattice expansion occurs at device operating temperatures. On the basis of EIS and PXRD studies, we postulate that in MAPbI(3) the predominant mechanism of accelerated device degradation under sunlight involves thermally activated fast ion transport coupled with a lattice-expanding phase transition, both of which are facilitated by absorption of the infrared component of the solar spectrum. Using these findings, we show that the devices show greatly improved operation lifetimes and stability under white-light emitting diodes, or under a solar simulator with an infrared cutoff filter or with cooling.
引用
收藏
页码:13130 / 13137
页数:8
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