Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/39034
Title: Quasi-2D Hybrid Perovskite Formation Using Benzothieno[3,2-b]Benzothiophene (BTBT) Ammonium Cations: Substantial Cesium Lead(II) Iodide Black Phase Stabilization
Authors: DENIS, Paul-Henry 
Mertens, Martijn
VAN GOMPEL, Wouter 
MAUFORT, Arthur 
MERTENS, Sigurd 
Wei, ZM
VAN LANDEGHEM, Melissa 
GIELEN, Sam 
RUTTENS, Bart 
Deduytsche, D
Detarvernier, C
LUTSEN, Laurence 
Grozema, F
VANDEWAL, Koen 
VANDERZANDE, Dirk 
Issue Date: 2022
Publisher: WILEY-V C H VERLAG GMBH
Source: Advanced Optical Materials, 10 (18) (Art N° 2200788)
Abstract: 3D hybrid perovskites (APbX(3)) have made a significant impact on the field of optoelectronic materials due to their excellent performance combined with facile solution deposition and up-scalable device fabrication. Nonetheless, these materials suffer from environmental instability. To increase material stability, the organic cation (A) is substituted by the non-volatile cesium cation. However, the desired photoactive cesium lead(II) iodide black phase is metastable in ambient conditions and spontaneously converts into the photo-inactive yellow delta-phase. In this work, the black phase is stabilized by the formation of a quasi-2D perovskite containing a benzothieno[3,2-b]benzothiophene (BTBT) large organic ammonium cation. Thermal analysis shows that degradation of the butylammonium (BA)-based quasi-2D perovskite (BA)(2)CsPb2I7 sets in at approximate to 130 degrees C, while (BTBT)(2)CsPb2I7 is phase-stable until approximate to 230 degrees C. Additionally, the (BTBT)(2)CsPb2I7 film does not show any sign of degradation after exposure to 77% Relative Humidity in the dark for 152 days, while (BA)(2)CsPb2I7 degrades in a single day. Photoconductor-type detectors based on (BTBT)(2)CsPb2I7 demonstrate an increased external quantum efficiency and a similar specific detectivity compared to the BA-based reference detectors. The results demonstrate the utility of employing a BTBT cation within the organic layer of quasi-2D perovskites to significantly enhance the stability while maintaining the optoelectronic performance.
Keywords: cesium black phase stabilization;low-dimensional perovskites;moisture stability;photodetectors;thermal stability
Document URI: http://hdl.handle.net/1942/39034
ISSN: 2195-1071
e-ISSN: 2195-1071
DOI: 10.1002/adom.202200788
ISI #: WOS:000815023800001
Rights: 2022 Wiley-VCH GmbH
Category: A1
Type: Journal Contribution
Validations: ecoom 2023
Appears in Collections:Research publications

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