A thermally stable, barium-stabilized α-CsPbI3 perovskite for optoelectronic devices

The all-inorganic perovskite CsPbI3 has emerged as an alternative photovoltaic material to organic–inorganic hybrid perovskites due to its non-volatile composition and comparable photovoltaic performance. However, its spontaneous deformation from the light-active black phase to a light-inactive yell...

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Published inJournal of materials chemistry. A, Materials for energy and sustainability Vol. 7; no. 38; pp. 21740 - 21746
Main Authors Kajal, Sandeep, Kim, Gi-Hwan, Chang Woo Myung, Shin, Yun Seop, Kim, Junu, Jeong, Jaeki, Atanu Jana, Jin Young Kim, Kim, Kwang S
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 2019
Subjects
Air temperature
Barium
Camphor
Chemical composition
Electronic devices
Fabrication
High temperature
Light emission
Low temperature
Morphology
Optoelectronic devices
Organic light emitting diodes
Perovskites
Photonic band gaps
Photovoltaic cells
Photovoltaics
Solar cells
Sulfonic acid
Surface stability
Thermal stability
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Summary:The all-inorganic perovskite CsPbI3 has emerged as an alternative photovoltaic material to organic–inorganic hybrid perovskites due to its non-volatile composition and comparable photovoltaic performance. However, its spontaneous deformation from the light-active black phase to a light-inactive yellow phase under ambient conditions, poor air stability, low thermal stability as well as high-temperature processing are challenging issues in the fabrication of CsPbI3-based solar cells. Herein, we introduce a new surface passivation strategy using camphor sulfonic acid (CSA) to improve the surface morphology and air stability of Ba-stabilized α-CsPbI3 perovskites at low temperature. The surface passivated, Ba-doped α-CsPbI3 was thermally stable upon annealing and highly photo-stable over a year, and it also exhibited a band gap of ∼1.72 eV, which is suitable for optoelectronic applications. The all-inorganic solar cell based on the Ba-doped α-CsPbI3 retained 98% of its initial PCE value even after 700 h, and red light-emitting diodes (LED) exhibited light emission at 700 nm with a bandwidth of 39 nm. To date, this is the first study on surface passivated, Ba-stabilized α-CsPbI3, which provides opportunities for the development of highly efficient tandem solar cells and other optoelectronic devices.
ISSN:2050-7488
2050-7496
DOI:10.1039/c9ta07827d