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

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

Authors :
Kajal, Sandeep
Kim, Gi-Hwan
Myung, Chang Woo
Shin, Yun Seop
Kim, Junu
Jeong, Jaeki
Jana, Atanu
Kim, Jin Young
Kim, Kwang S.
Source :
Journal of Materials Chemistry A; 10/14/2019, Vol. 7 Issue 38, p21740-21746, 7p
Publication Year :
2019

Abstract

The all-inorganic perovskite CsPbI<subscript>3</subscript> 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 CsPbI<subscript>3</subscript>-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-CsPbI<subscript>3</subscript> perovskites at low temperature. The surface passivated, Ba-doped α-CsPbI<subscript>3</subscript> 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-CsPbI<subscript>3</subscript> 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-CsPbI<subscript>3</subscript>, which provides opportunities for the development of highly efficient tandem solar cells and other optoelectronic devices. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
20507488
Volume :
7
Issue :
38
Database :
Complementary Index
Journal :
Journal of Materials Chemistry A
Publication Type :
Academic Journal
Accession number :
138913047
Full Text :
https://doi.org/10.1039/c9ta07827d