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Issue 38, 2019
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A thermally stable, barium-stabilized α-CsPbI3 perovskite for optoelectronic devices

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Abstract

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.

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

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Supplementary files

Article information


Submitted
19 Jul 2019
Accepted
27 Aug 2019
First published
28 Aug 2019

J. Mater. Chem. A, 2019,7, 21740-21746
Article type
Paper

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

S. Kajal, G. Kim, C. W. Myung, Y. S. Shin, J. Kim, J. Jeong, A. Jana, J. Y. Kim and K. S. Kim, J. Mater. Chem. A, 2019, 7, 21740
DOI: 10.1039/C9TA07827D

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