Homogenized halides and alkali cation segregation in alloyed organic-inorganic perovskites

被引：310

作者：

Correa-Baena, Juan-Pablo ^{[1
,2
]}

Luo, Yanqi ^{[3
,4
]}

Brenner, Thomas M. ^{[3
,4
,9
]}

Snaider, Jordan ^{[5
]}

Sun, Shijing ^{[1
]}

Li, Xueying ^{[4
,6
]}

Jensen, Mallory A. ^{[1
]}

Hartono, Noor Titan Putri ^{[1
]}

Nienhaus, Lea ^{[1
]}

Wieghold, Sarah ^{[1
]}

Poindexter, Jeremy R. ^{[1
]}

Wang, Shen ^{[3
,4
]}

Meng, Ying Shirley ^{[3
,4
]}

Wang, Ti ^{[5
]}

Lai, Barry ^{[7
]}

Holt, Martin V. ^{[8
]}

Cai, Zhonghou ^{[7
]}

Bawendi, Moungi G. ^{[1
]}

Huang, Libai ^{[5
]}

Buonassisi, Tonio ^{[1
]}

Fenning, David P. ^{[3
,4
,6
]}

机构：

[1] MIT, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[2] Georgia Inst Technol, Sch Mat Sci, Atlanta, GA 30332 USA

[3] Univ Calif San Diego, Dept Nanoengn, La Jolla, CA 92093 USA

[4] Univ Calif San Diego, Sustainable Power & Energy Ctr, La Jolla, CA 92093 USA

[5] Purdue Univ, Dept Chem, W Lafayette, IN 47907 USA

[6] Univ Calif San Diego, Mat Sci & Engn Program, La Jolla, CA 92093 USA

[7] Argonne Natl Lab, Adv Photon Source, Lemont, IL 60439 USA

[8] Argonne Natl Lab, Ctr Nanoscale Mat, Lemont, IL 60439 USA

[9] Weizmann Inst Sci, Dept Mat & Interfaces, IL-76100 Rehovot, Israel

来源：

SCIENCE | 2019年 / 363卷 / 6427期

关键词：

SOLAR-CELLS; HIGH-EFFICIENCY; HYBRID PEROVSKITES; FORMAMIDINIUM; PERFORMANCE; PHOTOVOLTAICS; HYSTERESIS;

D O I：

10.1126/science.aah5065

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The role of the alkali metal cations in halide perovskite solar cells is not well understood. Using synchrotron-based nano-x-ray fluorescence and complementary measurements, we found that the halide distribution becomes homogenized upon addition of cesium iodide, either alone or with rubidium iodide, for substoichiometric, stoichiometric, and overstoichiometric preparations, where the lead halide is varied with respect to organic halide precursors. Halide homogenization coincides with long-lived charge carrier decays, spatially homogeneous carrier dynamics (as visualized by ultrafast microscopy), and improved photovoltaic device performance. We found that rubidium and potassium phase-segregate in highly concentrated clusters. Alkali metals are beneficial at low concentrations, where they homogenize the halide distribution, but at higher concentrations, they form recombination-active second-phase clusters.

引用

页码：627 / +

页数：38

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