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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.
- 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