Investigation of moisture stability and PL characteristics of terpineol-passivated organic–inorganic hybrid perovskite

被引：34

作者：

Guo X. ^{[1
,2
]}

McCleese C. ^{[1
]}

Gao W. ^{[1
,3
]}

Wang M. ^{[3
]}

Sang L. ^{[4
]}

Burda C. ^{[1
,2
]}

机构：

[1] Department of Chemistry, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, 44106, OH

[2] Department of Materials Science and Engineering, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, 44106, OH

[3] Electronic Materials Research Laboratory, Key Laboratory of Ministry of Education, International Centers for Dielectric Research, Xi’an Jiaotong University, Xi’an

[4] Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, Key Laboratory of Heat Transfer and Energy Conversion, Beijing Municipality, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing

来源：

Materials for Renewable and Sustainable Energy | 2016年 / 5卷 / 04期

关键词：

Humidity degradation; Moisture stability; Perovskite paste; PL decay lifetimes; Terpineol passivation;

D O I：

10.1007/s40243-016-0081-1

中图分类号：

学科分类号：

摘要：

Abstract: This work presents a novel method for preparing perovskite films using a simple processing technique. Perovskite paste was prepared by dispersing an equimolar mix of PbI2 and methyl ammonium iodide powders into terpineol with stirring. From these precursors, perovskite films were fabricated using doctor blading and drying for 24 h at room temperature. The prepared films were then placed into relative humidity (RH) levels of 30, 50, and 70 % to test the moisture stability. The crystal structure, phases, and morphology were investigated with XRD and SEM/EDX. These samples exhibited good stability against long time exposure to moisture for 70 days. The XRD results showed that samples stored at RH 70 % contained only a small amount of hydrate compound after 70 days storage, while in the sample stored at RH 50 %, the formation of PbI2 was observed. The sample at RH 30 % manifested almost no change when stored for the same storage period. We attribute the enhanced moisture stability, compared with the spin-coated samples, to a passivated surface of the perovskite film by terpineol which exhibits a hydrophobic moiety. Time-resolved photoluminescence measurements show that the passivation of surface defect states by the formation of either PbI2 or hydrated compound leads to prolonged charge carrier recombination times. Graphical Abstract: [Figure not available: see fulltext.]. © 2016, The Author(s).

引用

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